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UNITED STATES DEPARTMENT OF THE INTERIOR GEOLOGICAL SURVEY National Center for Earthquake Research CATALOG OF EARTHQUAKES ALONG THE SAN ANDREAS FAULT SYSTEM IN CENTRAL CALIFORNIA FOR THE YEAR OPEN-FILE REPORT 78-1010 The report is preliminary and has not been edited or reviewed for conformity with Geological Survey standards and nomenclature. Any use of trade names and trademarks in this publication is for descriptive purposes only and does not constitute endoresment by the U.S. Geological Survey. Menlo Park, California 1978

UNITED STATES DEPARTMENT OF THE INTERIOR … san andreas fault system in central california for the year open-file report 78-1010 ... pcl 36-39^88 36-39.68 37- 3.04 36-59,00 36-45122

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UNITED STATES DEPARTMENT OF THE INTERIOR

GEOLOGICAL SURVEY National Center for Earthquake Research

CATALOG OF EARTHQUAKES ALONGTHE SAN ANDREAS FAULT SYSTEM IN CENTRAL CALIFORNIA

FOR THE YEAR

OPEN-FILE REPORT 78-1010

The report is preliminary and has not been edited or reviewed for conformity with Geological Survey standards and nomenclature.

Any use of trade names and trademarks in this publication is for descriptive purposes only and does not constitute endoresment by the U.S. Geological Survey.

Menlo Park, California

1978

CATALOG OF EARTHQUAKES ALONG THE SAN ANDREAS FAULT SYSTEM IN CENTRAL CALIFORNIA, FOR THE YEAR 1974

by F. W. Lester and K. L. Meagher

CONTENTS

PageIntroduc tion........................................................ 2Instrumentation..................................................... 2Data Processing and Analysis........................................ 3Discussion of Catalog............................................... 13Acknowledgments..................................................... 16References.......................................................... 17

ILLUSTRATIONS

Figure 1 Block diagram of the NCERtelemetered seismograph system........................ 4

2 System response of a typicalNCER telemetered seismograph station.................. 5

3 Map showing principal seismographstations used in locating earthquakes................. 11

4 Map showing earthquake epicenters reportedin the Appendix....................................... 15

TABLES

Table 1 Station data.............................................. 6

APPENDIX

Central California Earthquakes, 1974................................ 19

INTRODUCTION

Numerous small earthquakes occur each day in the Coast Ranges of central California. The detailed study of these earthquakes provides a tool for gaining insight into the tectonic and physical processes responsible for the generation of damaging earthquakes. This catalog contains the fundamental parameters for earthquakes located within and adjacent to the seismograph network operated by the National Center for Earthquake Research (NCER), U.S. Geological Survey, for the year 1974.

The motivation for these detailed studies has been described by Pakiser and others (1969) and by Eaton and others (1970). Similar catalogs of earthquakes for the years 1969, 1970, and 1971 have been prepared by Lee and others (1972b, c and d). Catalogs for the first, second, third, and fourth quarters of 1972 and the first, second, third, and fourth quarters of 1973 have been prepared by Wesson and others (1972a, b, 1973b, and 1974a and b), by Bufe and others U975J, and by Lester and others (1976a and b). The basic data contained in these catalogs provide a foundation for further studies.

This catalog contains data on 3073 earthquakes in central California. Arrival times at 152 seismograph stations were used to locate the earthquakes listed in this catalog. Of these 136 were telemetered stations operated by NCER. Readings from the remaining 16 stations were obtained through the courtesy of the Seismographic Station, University of California, Berkeley (UCB), and the California Department of Water Resources, Sacramento.

The Seismographic Station of the University of California, Berkeley, has for many years published a bulletin that both describes earthquakes in northern California and the surrounding area and lists readings at UCB stations from more distant events. The purpose of the present catalog is not to replace the UCB Bulletin, but rather to supplement it, by decribing the seismicity of a portion of central California in much greater detail.

INSTRUMENTATION

The telemetered seismograph system used is illustrated by the block diagram in Figure 1. The equipment at each station includes a vertical component, 1 Hz seismometer (usually Mark Products, Model L-4C), a package containing a preamplifier and voltage-controlled oscillator (usually Develco, Model 6202), and batteries. The frequency-modulated tone produced at each station is carried by wire (occasionally by radio) to a terminal where it is combined with tones from up to 7 other stations The resulting multiplexed signal is then transmitted by voice-grade telephone circuits or radio to the NCER office in Menlo Park, California.

The eight channels of data on each line are separated and demodulated by discriminators (usually Develco, Model 6203), and recorded on 16 mm film using a Develocorder (Teledyne, Geotech, Model FR-400). Each Develo- corder records seismic signals from up to 17 stations. In addition, 2 timing signals (WWVB on 2 traces, and a chronometer on 1 trace) are recorded simultaneously with the seismic signals.

Figure 2 illustrates the overall response of the seismic system for a typical station. Magnification for individual stations is adjusted according to the background noise level in steps of 6 decibels. As a result, the response for an individual station may differ from that of the typical station by a factor of 2, 4, 8, or 16. Precise calibrations indicate that most stations are operated at magnifications of 25,000 to 100,000 at 1 Hz.

All stations used in the present study are listed in Table 1. Station locations are plotted on Figure 3, except for 13 stations which are located outside the map boundaries.

DATA PROCESSING AND ANALYSIS

The telemetered seismic data recorded on 16 mm film were processed manually to yield information on first P-arrivals, directions of first motions, maximum amplitudes, and signal durations. These data were then processed by computer, using the HYP071 computer program (Lee and Lahr, 1972), to give origin time, hypocenter location, magnitude, and pattern of first motions of the earthquakes. Each roll of film contains about 24 hours recording and was processed in the following steps" (1) scanning, (2) timing, (3) preparing punched cards, (4) batch processing by computer program HYP071, (5) correcting errors, (6) adding data from other sources, (7) rerunning HYP071, (8) analyzing poor solutions, and (9) eliminating explosions.

In March of 1973 an automatic real-time earthquake detection system was introduced. It resembles but was different in many respects to that described by Stewart and others (1971). During the period reported here, this new system was only experimental and was not used to replace the technique of manually scanning films to detect earthquakes.

In the routine data processing, local events with signal duration of 10 seconds or more were always timed (see p. 12 for an explanation of signal duration). This corresponds to a cutoff at about magnitude 1 for events within the NCER network. Some smaller events for which 6 clear first arrivals could be obtained were also timed. The magnitude cutoff for events outside, but near the NCER network, was somewhat larger than 1. The catalog of earthquakes reported here contains all hypocenter solutions obtained, based on the above criteria. Because the station coverage was not uniform and because some events outside the network were reported, the cutoff for small magnitudes was not uniform over the entire area reported.

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FREQUENCY

100

Figure 2 System response of a typical NCER telemetered seismograph station. This magnification curve is obtained for a typi­ cal system (L-4C seismometer, Develco VCO/Amplifier, Develco Discriminator, and Geotech Develocorder) with electronic gains adjusted to produce a 10 mm peak-to-peak record ampli­ tude when a 10 v rms, 5 Hz, calibration signal is intro­ duced in place of the seismometer (attenution set at 42 db).

CODE

TABLE 1. STATION DATA

OES TELEMETERED STATIONS

LAT N LONG W ELV DCE) 0(W> NOTE**

ABPACHALMALXANDAN6

ANZARNBBRBCRBENB6H

BGMBOLBROBRPBTWBVL

BWRCALCANCARCASCBC

CBOCCRCDRCHRCNRCNS

COECOPCRNCRKCSHCYH

DILDIRDOODSRDURE6R

37-56.3537-58.5737- 9,5038-42.6537- 9.7737-51.68

36-53,0837-20'.9638-15.6537- 9.6236-30.6037-20.52

36-35.4837-48.9738- 0,4838-40.0736-18.9036-34.51

37-55.4537-27.0737- 1,5238-19.2835-55,9036-55.88

37- 6.7137-47.3038-22.1936-57.4636-42.5537-56.33

37-15,4637-58^3638- 1.1237-14.5037-38,8837-33154

f -36-50.1236-20.1837-43,8037-57,9838- 1.7837- 2.11

122-45.53121-45.62121-50,82122-45.30121-37.45122-25.77

121-35.45121-3T.96122-32.99122- 1.57121- 4.53122-20.34

121- 1.52122- 3.72120-24,92122-11.60120-55.75121-11 .34

122- 6.40121-47,95121-29.02122-47.73120-20.22121-39163

121-41.33121-57.00122-27 ? 70121r35'.01121-20.60120-31.76

121-40,35120-37.02120-30.57122- 7.82122-02,57122- V.62

_ T121-38.64120-22,58121-50,12122-15,17122- 0,05122- 6.25

14074

244379244223

122628137660448158

1216610387867381510

22126533298

1189219

192185620241305373

36633647560717038

204496198109168442

211111

211222

111122

111112

111121

111211

211112

(3.5)7.01.60.83.02.2

4 p 43,92.23,73,43.8

3.04.6(3,5)3.92.13.1

5.14.93.62.2

V4.4

2.27.12.22.14.8(3.5)

5 9(3^5)(3.5)4.0(3.5)21 5

3.25.16.8(3,5)5.4ii?

(3.5) 01/01 TO 10/316.21.8(3.5)3.22.2

1.44^22.24.73.03.8

(3.5)5.0

(3.5)(3.5) 05/10 TO 12/312.10.6

5.14.35.0.2.25.23.2

2.77.12.23.60.7(3.5)

6,8(3.5)(3.5)4.44.03.2

,.2,24<66.8 .

(3', 5)5.41.7

6

CODE

TABLE 1. STATION DATA (CONTINUED)

OES TELEMETERED STATIONS

LAT N LONG W ELV D(E) D(W)

EKHEMMEUCFELFRPFWL

GDHGHSGVRHCCHECHER

HMRJHCJOLJONLCHLNS

LORLRVLTRLTWLWRMCM

MDCMGAMHRMILMIXMNR

MOBMONMOPMORMRSMSJ

MUSOBFOCROLCPALPCL

36-39^8836-39.6837- 3.0436-59,0036-4512238- 1.17

35-49.8637- 5.7538-16.8436-58.8835-40.9336-22.38

38- 9.2836-32.8236- 5.0236-36.6537-44.2838- 9.15

36-14.7936-25.4636-53.0737-21.2236-39.9637-53.17

37-52'.9037-38.2237-21.5737-46,8838-24.6837-35.68

37-27,0136-36.0336-12.9137-48.6836-39.4837-31.25

38-33^0337-54.0036-55.0338- 2.3837-37.8837- 3.13

121-10145121- 5.76121-48.56121-24.09121-29.43120-35.00

120-21.17121-26.83122-12^89121-43.35121-09.15120-49.13

121-48.02121-23.53121-10.15121-18.81122- 3.83122-42.75

121- 2.55121- 1.08121-18.49122-12.25121-16.36120-30.40

121-54.85122-28.43121-45.38122-10 f 55122- 3.44121-38.22

122-11.00121-55,06120-47.69121-48.15120-^7.62121-52.23

122-43.37120-34.04121-30.46122-47.55121757,37121-17.40

342488438323705880

433778257159514750

65207336

1052312120

308555183270232362

117320151890

177500

21192784792769498

1341769830

463152

112121

111221

122211

221221

121111

122111

111211

1.60.83.03.22.2

(3.5)

3.32,35,24.04,34.3

6*. 30.92.11.54.31.9

0.15.53.03.85.1

(3.5)

4.82.45.33.15.74.6

3.81.11.86.63.94.3

3.3(3.5)3.02,64.32.2

4*.0

2.23.84.30.8(3.5)

3.44.45.24.24.30.8

6.30.91.10.74.61.9

0.12.14.53.42.4

(3.5)

4.82.46.2(3.5)5.74.6

2.61.11.96.63.84.3

3.3(3.5)4.42*64^13.6

NOTE

01/31 TO 12/31

01/01 TO 06/01

CODE

TABLE 1. STATION DATA (CONTINUED)

OES TELEMETERED STATIONS

LAT N LONG W ELV DCE) 0(W) NOTE

PESPFPPKFPKHPLVPMR

PNCPNMPNPPTVQSRRBM

RUSSACSAW

SBAISBCCSBCD

SBLCSBLGSBLPSBSCSBSMSBSN

SFRSFTSGMSHCSHGSHR

SJGSL1SL2SL3SL4SL5

SL6SL7SL8SPTSRSSTC

37-11,9436-13.8235-52.9136-51.3836-58.6236-57.19

36-33.7338-50.8536-10,1236- 6*. 5036-50.0236-50.70

37-54 r 7537-34.9537-12.7434-00.8034-56".4834-22.12

34-29.7934- 6.5734-33 f 6233-59.6834- 2.2533-14.70

37-47.2837-24.3138-52.0338-40.2236-24.8338-31.20

36-47^8837-04.87377 01 f 9037-06.8837-00.2637-04.26

^37-01.7037-01.7837-04.8138-10.9636T 40.1136-38;iO

122-20.90121-46.32120-24.81121-24.37121-49.93121-41.70

121-38.18122-56.78121-22.68120-43.27121-12.76120-49.40

121-54.33122-25.03122-10.06119-26.23120-10.32119-20.63

119-42.81119- 3.85120-24.03119-37.99120-20.99119-30.40

122-23.37122-10.55122-42.58122-38.03121-15.22122-36.43

121-34U3121-03.67121-03 ? 32121r08.29121-06.90121-d9".36

^121-05.52121-08.41121-05.65122-27 ? 20121-31.13121-14.38

8434946912215894

305783

1591506536372

331207262113610213

1190415134457172259

8143

10801200192328

171116293189219180

30221912288

399259

211122

212211

122222

222222

111121

211111

111122

V2.24.34.64.93.7

lU1 i?2.11,9V5?7

4.82.24.6(3.5)(3.5)(3.5)

(3.5)(3.5)(3.5)(3.5)(3.5)(3.5)

1.94104.11.30.52.0

3.02.32.32.32.32.3

2.32.32. 32.3VIf - £

2,52.45.36.54.03.5

1.61.61.31.9

; 4.0- 5^4

4.82.24.0(3.5)(3.5)(3.5)

(3.5)(3.5)(3.5)(3.5)(3.5)(3.5)

1.94.04.0 07/021.60.12.0

1.55.2 02/285.2 02/285.2 02/285.2 02/285.2 02/28

* 5.2 02/28* 5.2 02/28

5.2 02/282.20,5 ~1.9

TO 12/31

TO 12/31TO 12/31TO 12/31TO 12/31TO 12/31

TO 12/31TO 12/31TO 12/31

8

TABLE 1. STATION DATA (CONTINUED)

OES TELEMETERED STATIONS

ODE

STJSTNSTVSVCTAYTMN

TWNWDSWHWWKR

t LAT N

37-20.0337-54 p 2737-17.0737-17.113*-56.7338-23.15

36-03^1637-25.*0838-27,4235-48.87

LONG W

122- 5.48120-24,29122- 7.42121-46.35120-28.45122-40.83

121-30U5122-16.33122-53.26120-30.67

ELV

122366357128552105

147628050

503

K

112111

2212

D(E)

6.1(3,5)3.05.44.32.7

2*43,3r.64.2

DCW)

Ail(3 f 5)3.04.85.62.7

oU2.51.64.4

NOTE**

THIS COLUMN INDICATES THE OPERATION PERIOD. IF IT IS 9LANK THEN THIS STATION HAS BEEN OPERATED CONTINUOUSLY DURING 1974

UNIVERSITY OF CALIFORNIA STATIONS

CODE LAT N LONG W ELV DCE) DCW)

BKSBRKFHCFRIGCCJAS

LLAMHCMINPCCPRIPRS

SAOWDC

37-52.6037-52.4040-48,1036-59,5037- 1.8037-56.80

36-37,0037T 20,5040-20,7037-30,00

-367 *s 50. 36-19190

36-45^9040-34.80

122-14.10122-15.60123-59.10119-42,50121-59.80120-26.30

120-56.60121^38,50121-36.30122-22.90120-39.90121-22.20

121-26",70122-*2.40

27681

610119122457

47512821495

911187363

350300

111121

111212

21

2.42.4

(3,5)C3'.5>1.7

(3.5)

V4.5

(3.5)3.74.01.1

2>(3'. 5)

2.42.4

(3.5)(3.5)1.7

(3.5)

2.15.0

(3.5)3.74.01.1

1.0(3.5)

TABLE ll STATION DATA (CONTINUED)

CALIFORNIA DEPARTMENT OF WATER RESOURCES STATIONS

CODE LAT N LONG W ELV K D(E) D(W)

ORV 39-33 v.33 121-30^.00 362 1 (3.5) (3U) SLD 37-04.48 121-13.33 443 1 2.3 5.2

*LAT AND LONG ARE LATITUDE AND LONGITUDE IN DEGREES AND MINUTES. ELV IS ELEVATION IN METERS. D(E) AND D(W) ARE GIVEN IN KILOMETERS. SEE TEXT (P. 12 ) FOR EXPLANATION OF K, D(E), AND D(U).

10

40.00*

lSAN FRANCISCO\\

A NCER TELEMETERED STATION

O STATION OPERATED BY UCB

STATION OPERATED BY COWR

0 SOKM

35.50*'

Figure 3. Map showing principal seismograph stations used in locating earthquakes.

11

Location of earthquakes was based mainly on first P-arrivals. When an adequate location could not be obtained using P-arrivals alone, S-arrivals were used to supplement the P-arrivals whenever possible. The HYP071 computer program uses Geiger's method (Geiger, 1912) to determine hypocenters by minimizing the residuals between observed and calculated arrivals in a least-squares sense. Traveltimes from a trial hypocenter to the stations and their partial derivatives are computed on the assumptions of a horizontal multilayer velocity model by a technique introduced by Eaton (1969).

The crustal velocity model used was derived mostly from analysis of explosion data by Wesson and others (1973a). It is specified by:

Layer Depth (km) P-velocity (tap/sec) S-velocity (km/sec)

1 0 to D 4.0 2.22 D to 15 5.9 3.33 15 to 25 6.8 3.84 below 25 8.05 4.5

The variable boundary between the first and second layer (depth D) is determined for each station from time-term analysis of explosion data. The variable first layer in the crustal model is an approximation of the sedimentary layer above the Pg refractor. To allow for sharp changes in sediment thickness across the San Andreas fault, two D values for each station were determined: one for sources east of the fault, and the other for sources west of the fault. The set of D values to be used in the program is determined by the location, relative to the fault, of the station with the earliest P-arrival time. For example, if the earliest P-arrival occurs at a station west of the fault, then the set of D values appropriate to the sources on the west side, D(W), of the fault is selected. Table 1 shows values of D, in kilometers, at each station for sources east (D(E)) and west (D(W)) of the San Andreas fault, as well as the location of the stations relative to the fault (K = 1 for east, and K = 2 for west). An assumed value for D of 3.5 km (about the median of the calculated values) is given in parentheses if a value could not be determined from the explosion data.

The method used for estimating the Richter magnitude of the earth­ quakes has been described by Lee and others (1972a). In brief, the magnitude of an earthquake is based on the average of magnitudes estimated at various stations. Station magnitude (M) is derived from its recorded signal duration (T) according to:

M = -0.87 + 2.00 log (T) + 0.0035A

where A is the epicentral distance in kilometers. The signal duration is defined as the duration time in seconds from the onset of the first P-arrival to the point where the trace amplitude (peak-to-peak) falls below 1 cm as it appears on the Geotech film viewer.

12

For earthquakes with Richter magnitudes of 3.5 and below, equation (1) gives a good estimate of the magnitude: however, for Richter magni­ tudes above 3.5, the relationship between signal duration and magnitude is still under investigation. Therefore, for earthquakes with signal duration magnitudes of 3.5 or greater, Richter magnitudes have been calculated (Richter, 1942) using records obtained from the UCB Wood- Anderson seismographs at Berkeley and Mount Hamilton, and the Stanford- USGS Wood-Anderson at Palo Alto. The earthquakes for which the Richter magnitude has been determined from Wood-Anderson records are indicated in the Appendix by an R next to the magnitude.

A substantial effort has been made to identify man-made explosions so as to eliminate them from the catalog* Explosions can be identified on the basis of one or more of the following criteria: location of a known quarry or blasting site, shallow focal depth, time of day, focal mechanism, and/or through correspondence with quarry operators. During 1974, 138 blasts were identified and eliminated from the catalog.

DISCUSSION OF CATALOG

The parameters for the earthquakes listed in the Appendix include the origin time, location of hypocenter (epicenter and focal depth), and magnitude. In addition, six other parameters are listed so that an evaluation of the quality of the hypocenter solution may be made. These parameters are (1) the largest azimuthal separation between stations, GAP, (2) epicentral distance to the nearest station, DMIN, (3) root-mean-square error of the time residuals, RMS, (4) standard error of the epicenter, ERH, (5) standard error of the focal depth, ERZ, and (6) number of P- and S-arrivals used in locating the event, NO. Based on these parameters, the general reliability of each earthquake solution is graded as either excellent (A), good (B), fair (C), or poor (D). Exact rules of quality classification are given in the Appendix.

A brief discussion on the accuracy of hypocenter determinations has been given by Lee and others (1971). To obtain a reliable epicenter, GAP should be less than 180*: to obtain a reliable focal depth, DMIN should be less than the focal depth. In addition, systematic errors arise from uncertainties in the crustal velocity model. These errors cannot be determined except through controlled experiments, e.g., known explosions in the focal region. Because we present all hypocenter solutions of earthquakes in the region we studied, their quality varies. Although standard errors of epicenter and focal depth (ERH and ERZ) are given, they must be interpreted with caution, especially for quality C and D solutions. Hypocenter solutions for known blasts distributed throughout the San Francisco Bay region indicate that the true positions are often within the standard error limits of the solutions, provided that the conditions GAP < 180° and DMIN is within a few kilometers are met. For example, comparison of locations determined for well-recorded quarry blasts (solution quality A) with the known coordinates indicate a typical

13

error of about 1 km. Based on comparisons between calculated and true quarry blast locations, a general statement on the accuracy of our hypocenter solutions is as follows:

Solution Quality Approximate accuracy inEpicenter Focal Depth

A (excellent)B (good)C (fair)D (poor)

12.555

kmkmkmkm

2 km5 km5 km5 km

Epicenters listed in the Appendix are plotted according to magnitude in Figure 4.

The dashed lines in Figure 4 indicate the boundaries of the NCER seis­ mograph network as it existed during 1974. We feel that the hypocenters listed in the the Appendix represent a nearly complete set of earthquakes above magnitude 1 within these boundaries and that these earthquakes are generally well located. Earthquakes outside the dashed boundaries in Figure 4 tend to have less reliable locations, depending on their distance from the network and their relationship to its geometry. Further, the minimum magnitude event that we can detect and locate increases with increasing distance from the network. For earthquakes outside the network, which yielded unsatisfactory locations on the basis of first P-arrivals alone, S-arrivals were included whenever possible.

We believe that the precision of the earthquake locations (or the relative locations) is better than the absolute accuracy of the earthquake locations. Despite our attempts to model the laterally inhomogeneous nature of the velocity structure within the earth's crust using a variable surface layer, we suspect that the locations within certain parts of the area included in the boundaries of the network may be systematically biased by as much as 2-3 km (Mayer-Rosa, 1973).

Some of the earthquakes listed in this catalog represent multiple events, that is, earthquakes from a given source region which occur in such rapid succession that the seismographs are still recording arrivals from one earthquake when the first arrivals from a following earthquake begin to appear. Depending on the size of the individual events and their separation in time, it may not be possible to accurately time and locate the later event(s), and therefore only the location of the first event in the multiple sequence is listed in the Appendix.

The contents of the Appendix, along with similar location information for central California earthquakes since 1969, may be obtained (at modest cost) in forms amenable to computer input (magnetic tape) by contacting:

National Geophysical Data Center Environmental Data Service

NOAA Boulder, CO 80302

14

40C O.CO

SYMBOL MAGNITUDE

M < I 5

15 < M < 25

x 25 < M < 35

X 35 < M <X M > 45

Figure 4. Map showing earthquake epicenters reported in the Appendix, Earthquakes in the region enclosed by the dashed line are generally well recorded and located.

15

ACKNOWLEDGEMENTS

Some of the arrival times used in this study were obtained through the courtesy of the Seismographic Station, University of California, Berkeley, and the California Department of Water Resources, Sacramento. We thank Dr. B. A. Bolt, Director of the first institution, and Mr. Paul Morrison of the last institution, for their cooperation. Roy Miller of UCB and his staff offered generous help with their data and records. We are indebted to many quarry operators for helping us to eliminate blasts from the earthquake catalog.

We are grateful to Wayne Jackson, John Van Schaack, Ron Radarabek, Wes Hall and their associates for operating the NCER seismograph stations and telemetry network. We thank Shirley Marks, Carol McHugh, Sharon Kirkman, and Sue Conens for their help in various phases of data processing and for comments on the manuscript.

We are most deeply indebted to J. P. Eaton, W. H. K. Lee, J. C. Lahr, and J. H. Pfluke of NCER for their development of the techniques and computer programs which have made the preparation of this catalog a routine production.

16

REFERENCES

Bufe, C. G., F. W. Lester, K. L. Meagher, and R. L. Wesson, Catalog of earthquakes along the San Andreas fault system in central California, April-June, 1973, U.S. Geological Survey Open-File Report 75-125, 44 p., 1975.

Eaton, J. P., HYPOLAYR - a computer program for determining hypocenters of local earthquakes in an earth consisting of uniform flat layers over a half space. U.S. Geological Survey Open-File Report, 155 p., 1969.

Eaton, J. P., W. H. K. Lee, and L. C. Pakiser, Use of mi cr ©earthquakes in the study of the mechanics of earthquake generation along the San Andreas fault in central California, Tectonophysics , v. 9, p. 259-282, 1970.

Geiger, L. , Probability method for the determination of earthquake epi­ centers from the arrival time only (translated from Geiger 's 1910 German article) Bulletin of St. Louis University, v. 8, p. 56-71,

Lee, W. H. K. , and J. C. Lahr, HYP071: a computer program for determining hypocenter, magnitude, and first motion pattern of local earthquakes, U.S. Geological Survey Open-File Report, 100 p., 1972.

Lee, W. H., K. , J. P. Eaton, and E. E. Brabb, The earthquake sequence near Danville, California, 1970, Bulletin Seismological Society of America, v. 61^, p. 1771-1794, 1971.

Lee, W. H. K. , R. E. Bennett, and K. L. Meagher, A method of estimating magnitude of local earthquakes from signal duration, U.S. Geological Survey Open-File Report, 18 p., 1972a.

Lee, W. H. K. , J. C. Roller, P. G. Bauer, and J. D. Johnson, Catalog of earthquakes along the San Andreas fault system in central California for the year 1969, U.S. Geological Survey Open-File Report, 49 p., 1972b.

Lee, W. H. K. , J. C. Roller, K. L. Meagher, and R. E. Bennett, Catalog of earthquakes along the San Andreas fault system in central California for the year 1970, U.S. Geological Survey Open-File Report, 73 p., 1972c.

Lee, W. H. K. , K. L. Meagher, R. E. Bennett, and E. E. Matamoros, Catalog of earthquakes along the San Andreas fault system in central California for the year 1971, U.S. Geological Survey Open-File Report, 62 p., 1972d.

17

Lester, F. W., K. L. Meagher, and R. L. Wesson, Catalog of earthquakes along the San Andreas fault system in central California, July-September, 1973, U.S. Geological Survey Open-File Report 76-169, 38 p., 1976a.

Lester, F. W., S. L. Kirkman, and K. L. Meagher, Catalog of earthquakes along the San Andreas fault system in central California, October - December 1973, U.S. Geological Survey Open-File Report 76-732, 37 p., 1976b.

Mayer-Rosa, Dieter, Traveltime anomalies and distribution of earthquakes along the Calaveras fault zone, California, Bulletin Seismological Society of America, v. 63, p. 713-729, 1973.

Pakiser, L. C., J. P. Eaton, J. H. Healy, and C. B. Raleigh, Earthquake prediction and control, Science, v. 166, p. 1467-1474, 1969.

Richter, C. F., An instrumental earthquake magnitude scale, Bulletin Seismological Society of America, v. 25, p. 1-32, 1942.

Stewart, S. W., W. H. K. Lee, and J. P. Eaton, Location and real-time detection of microearthquakes along the San Andreas fault system in central California, Recent Crustal Movements, Royal Society of New Zealand Bulletin, v. 9, p. 205-209, 1971.

Wesson, R. L., R. E. Bennett, and K. L. Meagher, Catalog of earthquakes along the San Andreas fault system in central California, January-March, 1972, U.S. Geological Survey Open-File Report, 60 p., 1972a.

Wesson, R. L., R. E. Bennett, and F. W. Lester, Catalog of earthquakes along the San Andreas fault system in central California, April- June, 1972, U.S. Geological Survey Open-File Report, 42 p., 1972b.

Wesson, R. L., J. C. Roller, and W. H. K. Lee, Time-term analysis and geologic interpretation of seismic traveltime data from the Coast Ranges of central California, Bulletin Seismological Society of America, v. 63, p. 1447-1471, 1973a.

Wesson, R. L., K. L. Meagher, and F. W. Lester, Catalog of earthquakes along the San Andreas fault system in central California, July- September, 1972, U.S. Geological Survey Open-File Report, 49 p., 1973b.

Wesson, R. L., F. W. Lester, and K. L. Meagher, Catalog of earthquakes along the San Andreas fault system in central California, October- December, 1972, U.S. Geological Survey Open-File Report, 46 p., 1974a

Wesson, R. L., F. W. Lester, and K. L. Meagher, Catalog of earthquakes along the San Andreas fault system in central California, January- March, 1973, U.S. Geological Survey Open-File Report, 46 p., 1974b.

18

APPENDIX; CATALOG OF EARTHQUAKES FOR THE YEAR 1974

Earthquakes along the San Andreas fault system in central California for 1974, are listed chronologically in this Appendix.

The following data are given for each event:

1. Origin time in Coordinated Universal Time (UTC): date, hour (HR), minute (MN), and second (SEC). To convert to Pacific Standard Time (PST), subtract eight hours, to Pacific Daylight Time (PDT), subtract seven hours.

2. Epicenter in degrees and minutes of north latitutde (LAT N) and west longitude (LONG W).

3. DEPTH, depth of focus in kilometers. If "*" follows the DEPTH, it means that the focal depth is constrained by the location program.

4. MAG, local magnitude of the earthquake. If "R" follows the magnitude, it indicates the Richter magnitude calculated from Wood-Anderson seismograph records.

5. NO, number of P- and S-arrivals used in locating earthquake.

6. GAP, largest azimuthal separation in degrees between stations.

7. DMIN, epicentral distance in kilometers to the nearest station.

8. RMS, root-mean-square error of the time residuals:

RMS = / I R i

where R^ £ s the observed seismic-wave arrival time minus the computed time at the ith station.

9. ERH, standard error of the epicenter in kilometers:

ERH » / SDXZ + SDYZ

where SDK and SDY are the standard errors in latitude and longitude, respectively, of the epicenter.

10. ERZ, standard error of the depth in kilometers.

11. Q, solution quality of the hypocenter. This measure is intended to indicate the general reliability of each solution.

19

Epicenter Focal Depth

A B C D

excellent good fair poor

good fair poor poor

Q is based on both the nature of the station distribution with respect to the earthquake and the statistical measure of the solution. These two factors are each rated independently according to the following schemes.

Station Distribution

NO

A B C D Others

GAP

±9°I135 <180

DMIN

< DEPTH or 5 kmT 2 x DEPTH or 10 km< 50 km

Statistical Measures

A B C D

RMS (sec)

< 0.15 < 0.30 < 0.50 Others

ERH (km)

-? 1.0< 2.5< 5.0

ERZ (km)

2.0 5.0

Q is taken as the average of the ratings from the two schemes, i.e., an A and a C yield a B, and two B's yield a B. When the two ratings are only one level apart the lower one is used, i.e., an A and a B yield a B.

12. QUADRANGLE, for earthquakes between 35o QO.O 1 and 40° 00.0* N latitude and 119o 45.0' and 123° 45.0' W. longitude, QUADRANGLE indicates the name of the U.S. Geological Survey 7.5 quadrangle (or quadrant of 15* quadrangle), on which the epicenter is located. For earthquakes offshore or outside the designated area, the entry is starred and indicates the general geographic area in which the epicenter is located, for example, "***MONTEREY BAY***".

20

CE

NT

RA

L

CA

LIF

OR

NIA

F

AP

TH

fiU

A<

FS

--1

l?7

4

19

74

JA

N

1 1 1 1 1 1 1 2 2 2 2 2 2 3 3 3 3 3 3 4 4 4 5 5 5 5 5 5 5 6 6 6 6 6 6 6 6 7 7 7 7 7 7 7 7

HR

M

N

6 12

7 9

7 58

9 35

15

0

17

47

23

39

1 1

52

318

6

18

41

9

25

21

61

32

3 3

2

8 55

11

28

1315

21

38

0 1

5

10

50

17

2

53

56

4 0

4 1

2

10

4

617

2

722

5

22

3

61

12

2 35

2 41

3 6

4 55

5 6

21

52

22

43

1 3

75

53

10

38

1 1

91

5 4

516

30

17

0

18

14

sec

14

.010.9

53

.635.6

46.9

4.0

54,9

47.0

20*.

99

*8

19,7

23

?1

8,4

45^3

34.6

16,2

40*

79.8

13.6

58.0

5 6*

. 8

38.5

47

.151.0

4*.

6

59

.51

9.0

58.3

53

,01711

17

.43

5*8

59

.154.1

27.8

39.0

u'.o

17

.41

2.0

39

1 7

29

.35?.

43

9.4

47.0

43

.4

LA

T

N

38-4

412

36-2

7.

337-3

8.

33

6-5

0.6

35

-48

.0

36-5

7.7

36

-31

, 5

36

-54

,637-3

7,9

36

-46

.9

37-1

2^0

36-4

4t5

36

-30

*8

36

-1 6

, 0

36

-41

.2

36

-56

17

37-1

7,3

36

-27

.236-3

0.3

36-5

6*.

8

37

-45

', 6

36

-36

.73

7-2

6.9

37

-15

. 3

36-2

4*.

1

36

-56

. 8

36-3

8.8

36-4

5.2

37-4

9'.8

36-3

8'. 3

36-5

7.2

36

-57

,13

6-4

4'. 0

36-3

9.8

36

-28

.4

37

-25

,037-2

5'. 5

37

-50

.736-3

2.

337-

0.9

36-4

5.

83

7-5

H.3

35-5

7.7

37

-51

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36-3

*.

2

LON

G

W

1 22-4

4.0

12

1-

4.3

1?

2-

1 .9

121-3

4.5

12

1-

9.6

121

-39.

01

21

- 7.0

121-4

7f

91

21-4

3.9

12

1-3

1 .

3

% 2

1-4

31

51

1*1

-27

.31

21

- 7t9

;i2

0-4

3R

7,;<

121 -

20.1

' 121-3

6f

51

21

-38

16

12

1-

4.7

12

1-

7.1

121-2

5.9

121-5

6.7

121-1

5.0

1 2

1-3

2.1

121-5

7,8

1 20-5

8*.

1

121-3

6.9

121-1

7.6

121-2

0,8

12

1-5

61

1121-1

6.9

121-3

8.0

. 121-3

7,5

121-2

5.6

121-1

9.4

12

1-

2.8

121-4

9.2

1 2

1 -

4 1

1 6

122-1

7,5

12

1-

8.6

121-4

3.1

121-2

8.0

121-5

9.0

120-5

6.7

1 21

-57.

P121-1

6.9

DF

PT

H

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5]2

2.P

5.

S8

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2.5

8.4

11.2 slo

7.5

9.0

6.8

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10,3

3.1

9,6

3.0

5.7

7.5

415

5.8

5.5

7.8

5.3

8.1

1 .7

1 3

.17.4

1.0

5.2

3.5

5l4

5.4

1 5

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3.2 Us

5.0

9.4

9.9

5.8

11.8

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1.4

MA

G

1,8

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O.R

1 .

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2,0

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1 .5

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n.9

1 1 1

2.1

n.p

n.7

n 1 °

1 .3

n.9

1 .7

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1 .2

1.?

1 .0

nil

NO 9 7

1 3

1 6 9

10

1 1

1 3 7

27 16

25 9 7 7 8 9

20 8

16

1 3

1 4 9

1 6

11 10 1 2

1 0

16

10

23 m 1 5

21 7 9 9

1 1 7

24 R

1 3 6

1 1 8

GA

P

1*7

12

858 72

??

3

60 84

178

15

78

8 80

73

91 111

11

6 79

86

63

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95 75 55

60

20

85

81

25 84 52

90 57

57

45 63 69

59

161

11

81

06

98

154 48

90

611

69

7S S7

DM

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55

*2l8 V

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3j5

4S,0 8(

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3*0

2,8

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53

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3*4

& 456

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10

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3.7

213

4,0

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4,R

3,3

RM

S

o.m

0.1

20.1

50.1

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0.0

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0.1

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0.1

10^16

0,1

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0.1

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0,0

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0.0

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0,1

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0.1

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0.1

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0.1

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0",

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0.0

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0,1

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3

FR

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1

1.2

n'1'

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0,4

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0,3

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0,4

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ni

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Q C 8 9 B D A A 9 B A A 8 B B B A A"

9 B B A A D B B A A

.'' "

B A B B a B 3 A 8 A C B A

QU

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RA

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LE

MO

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TO

PO

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WA

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SA

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TT

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21

CENTRAL CALIFORNIA FAR THOUAKFS--1974 (CONTINUFD)

1974

HR MM

SEC

LAT

NLONG W

OFPTH

MAG

NO GAP

DM IN

RMS

FRH

FRZ Q

QUADRANGLE

JAN

7 7 8 8 8 8 8 8 8 9 9 9 9

10

10

10

10

10

10

10

10

10

10

10

10

10

10

10

10

10

10 10

10

10

10

10

10

10

10 10 11 11 11 11 11

?1

422

22

n 57

3 56

4 4

9

11

12

13

6

16

38

20

30

5 3

2

6 0

20

17

21

8

7 3

79

27

9 35

10

5

511

8

11

18

11

19

11

22

11

33

11

37

11

38

11

44

12

21

12

26

12

53

13

01

3

5

13

2114

26

14

29

15

17

17

7

18

5

819

14

21

21

23

12

23

47

0 50

n 56

1 47

5 2

911

2

6

8.6

13

.55

?.

420.8

is; 6 9.3

58.3

32'.

11

4.4

17.9

42.7

39

.638.4

16.2

31:6

27".

64

1.4

30.0

1 .7

2 9*

. 9

24

.739.6

10

,55

.810.4

25.1

52

^3

57

.859.2

36

,11

19,4

22*.

747.0

23

.027.1

2U

22

9^2

53

.642.4

29'.9

19.2

45.5

9.4

42.2

24.2

37

-51

.9

36

-V3

.63

6-3

3.9

36-3

5.7

38

-2?

. 8

37-2

5.2

37-2

1.8

37

-29

^0

37-2

2.9

36-2

7.7

37

- 3y6

36-3

6f

43

6-4

5.8

36-3

3.7

36-3

7*7

36-3

7^8

36

-37

.63

7-3

2.

33

7-3

2*

0

37-3

2.2

36-5

7.1

37-3

2.3

36-3

7.8

36-3

3.5

36

-57

. 1

36

-56

.836-5

7.1

36

-37

*.4

36

-57

.03

6-5

7;

1

37

- 2

.636-5

7,0

36

-57

.236-5

6.9

36-5

6;9

36

-5l'.7

36-4

9.1

36

-57

, 2

38-4

2".

836-5

8*.

8

37-4

7.9

37-4

7.8

37

-47

. 7

37

-10

*. 4

36-2

7.8

1 2

1-5

8.

5121-1

?.

11

21

-11

. 5

121-1

1 .

4122-3

6.0

121-4

5.3

12?-

8i9

12

1-3

6.2

1 21-4

2.6

121-

4.3

12

1-1

2.6

f21

- 7

lO121-2

8.3

42

1-1

1.6

1;2

1-

8.7

12

1-

8*5

12

1-

8.5

121-5

4.3

12

1-5

4.3

121-5

4^4

121-3

5.7

121-5

4.5

12

1-

8.7

1 2

1 -

1 T

. 5

121-3

5.4

121-3

5.0

121

-34', 7

12

1-

8*. 6

121-

37:1

12

1-3

4.9

121-A

4r

81

21

-35

.31

21

-35

.51

21

-35

.1121-3

5;0

121-3

0*.

11

21

-28

.21

21

-35

.31

22

-44

;9121-2

7'.0

12

1-5

7.6

12

1-5

7.6

12

1-5

7.4

122-

6'.9

12

1-

4.9

5.?

6.1

V 9.1

4.4

4 .4

6,

80

.66

.7?

.4

6,4

5.6

6.9

6?

?1

^3

1 2*

. 7

15,5

5.5

5.1

5*5

7.7

5.'4

1 2

t 5

P.1

5.8

5.9

7.1

1 4

.61

2.7

5.8

12,8

5.4

6.8

6.3

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74

(C

ON

TIN

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D)

1974

JAN

21 ?2 22

22

22

22 22 22

22

23 23

23

23

23

23

23

23

23

24

24

24 24 24 24 24 24 25 25 25 25 25 25 26 26

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HR MN

CENTRAL CALIFORNIA F4RTHOUA<FS--197 4 (CONTTNUFO)

SFC

LAIN

LONGW

OFPTH

MAG

NO GAP

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RMS

ERH

ERZQ

QUADRANGLE

JAN 26

26 27 27 27 27 27 27 27 27 27 28 28 28 28 28 28 28 28 28 28 28 29 29 29 29 29 29 30 30 30 30 30 30 30 30 30 30 30 31 31 31 31 31 31

22

231 a 11 13 14 14 16 19 211 4 5 6 7

10 14 19 21 22 232 2 4 8

14 210 1 2 2 4 5 5 8 8

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223 4 4 7 8

1 1

31

33 35 26 50 34 11 43 21 22 47 43 25 58 15 26 10 536 0

402

29 50 29 35 18 38 51 40 20 359

31 54 47 53 463

40

246 468 6

27.0

37.4

57.7

17.9

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34"

832.3

17.8

12.5

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2.7

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36-5

7*.

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32'.

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31

CENTRAL CALIFORNIA

F A R THOU AK

E S--1 9 7 4 (CONTINUED)

1974

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SEC

LAT N

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DEPTH

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QUADRANGLE

BICKMORE CANYON

MT DAY

CHITTENDEN

CALAVERAS RESERVOIR

LICK OBSERVATORY

BICKMORE CANYON

BICKMORE CANYON

FRANKLIN POINT

PAICINES

TOPO VALLEY

LA COSTA VALLEY

LA COSTA VALLEY

LA COSTA VALLEY

LA COSTA VALLEY

LA COSTA VALLEY

LA COSTA VALLEY

'LA

COSTA VALLEY

LA COSTA VALLEY

LA COSTA VALLEY

LA COSTA VALLEY

[

ST HELENA

LA COSTA VALLEY

SAN

LEANDRO

BICKMORE CANYON

LA COSTA VALLEY

SAN BENITO

LA COSTA VALLEY

STOCKDALE MTN

THREE SISTERS

HOLtlSTER

CALAVERAS RESERVOIR

SAN BENITO

SAN PENITO

MONARCH PEAK

PARKFIELD

PARKFIELD

ROCK SPRING PEAK

WINTFRS

BICKMORE CANYON

MT DAY

CALAVERAS RESERVOIR

CALAVERAS RESERVOIR

SAN PENITO

PAICINES

PAICINES

CE

NT

RA

L

CA

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74

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SEC

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28

28

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--1974

(CO

NT

INU

ED

)

1 974

APR

3 3 3 3 4 4 4 5 5 5 5 5 5 5 5 5 5 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 7 7 7 7 7 7 7 8 a 8 8 8 8

HR MN

5 4?

10 43

14

111716

7 28

8 21

19 36

1 1

2 47

7 37

10 24

11 57

13 40

18 30

20 53

21 43

23 56

3 8

10 47

10 47

11 22

11 36

1215

15

81511

15 41

16 37

16 51

23

223

39

23 39

23 59

3 37

8 55

10 47

13 30

18 10

19 30

22

70

46

1 26

2 35

6 49

7 12

9 20

SEC

9'.0

11 .7

6.9

51 .1

35.4 5.4

"«:

3S3

59.1

45.6

46.7

19.1

56,9

28.3

21 '

.3

25'.4

8f'6

7.1

50.9

5310

55.7

38.9

51,7

36.8

29.2

44.8

25.8

53^3

54.2

56.5

57.9

38.9

19;?9.4

40.8

2'. 3

4.8

1 .9

3 2: 4

44". 3

31.3

1.1

10.4

54*8

48.7

LAT N

37-21.1

37- 6,6

36-13.3

36-52'.2

36-27.5

36-27.7

36-56.7

36-34.2

35-59*6

37- 1:0

36-32J8

36-57*5

36-13.2

35-59j3

35-5910

35-58',

736-56,6

36-52.7

36-37.2

36-37*3

35-58.7

36-35.7

36-49*9

36-15.2

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MT DAY

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HR MN

CENTRAL CALIFORNIA E«RTHQUAKES--1974 (CONTINUED)

SEC

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DEPTH

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NO GAP

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1974

HR MN

SEC

LAT

NLONG W

DEPTH

MAR

NO GAP

DM IN

RMS

ERH

FRZ

Q QUADRANGLE

JUN

1

5 15

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16

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16

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16 16

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C;--1974 (CONTINUED)

1 9

74

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18

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PANOCHF. PASS

PANOCHE PASS

PANOCHE PASS

WATSONVILLE EAST

BICKMORE CANYON

8ICKPORE CANYON

PAICTNFS

***OFFSHORE -

MORO BAY***

ROCK SPRING PEAK

ROCK SPRING PEAK

ROCK SPRING PEAK

PANOCHE PASS

BICKMORE CANYON

NIT HARLAN

MT HARLAN

'PAICINES

NORTH CHALONE PEAK

PAICINES

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TOPO VALLEY

BICKMORE CANYON

CUPERTINO

BICKMORE CANYON

LICK OBSERVATORY

LICK OBSERVATORY

LICK OBSERVATORY

PAICINES

GILROY HOT SPRINGS

54

CENTRAL CALIFORNIA F.ARTHQUAKES--197 4 (CONTINHFD)

1 974

JUN

2

3 23

23

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24 24 24 25 25 25 25 25

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CENTRAL CALIFORNIA E*

R T HO U A<

F «? --1 9 74 (CONTINUED)

1974

JUN

29 29

29

29 30 30 30

30 30

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1974

JUL

6 6 6 6 6 6 6 6 6 6 6 6 6 7 7 8 8 8 9 9 9 9 91

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1974

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58

CENTRAL CALIFORNIA EARTHOUAKFS--1974 (CONTINUED)

1974

HR MN

SEC

LAT

NLONG W

DEPTH

MAG

NO GAP

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fAPTHQUA<FS--19?4 (CONTINUED)

1 9

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QUADRANGLE

THREE SISTERS

STOCKDALE MTN

BICKMORE CANYON

EYLAR MTN

8ICKMORE CANYON

LONOAK

BICKMORE CANYON

BICKMORE CANYON

CHERRY PEAK

EYLAR MTN

SAN BENITO

BICKMORE CANYON -

STOCKOALE MTN

* LONOAK

IDRIA

BICKMORE CANYON

* "ANTIOCH SOUTH

BICKMORE CANYON

SAN JUAN BAUTISTA

SAN JUAN BAUTISTA

BICKMORE CANYON

SAN FELIPE

v MT JOHNSON

MT JOHNSON

BICKMORE CANYON

WATSONVILLE EAST

MT JOHNSON

BICKMORE CANYON

BICKMORE CANYON

BICKMORE CANYON

CHlTTfNDEN

BICKMORE CANYON

LONOAK

BICKMORE CANYON

BICKMORE CANYON

BICKMORE CANYON

BICKMORE CANYON

CHOUNET RANCH

QUIEN SABE VALLEY

BICKMORE CANYON

TRES PINOS

BICKMORE CANYON

RICKMORE CANYON

BICKMORE CANYON

MT JOHNSON

61

CENTRAL CALIFORNIA EARTHOUAKES--1974 (CONTINUED)

1 974

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68

CENTRAL CALIFORNIA

F A R THRU AK

F S--1 9 7 4 (CONTINUE)

1974

HR MN

SEC

L AT

N

LONG W

OFPTH

MAG

NO GAP

DM IN

PMS

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FPZ 0

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SE

P

16

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PAICINES

PAICINES

RICKMORF. CANYON

TOPO VALLEY

CALAVERAS RESERVOIR

LICK OBSERVATORY

MINOEGO HILL

HOLLISTER

BICKMORE CANYON

ST HELENA

MT DAY

CALAVERAS RESERVOIR

HOLLISTER

SAN BENITO

TOPO VALLEY

SAN LEANORO

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QUIEN SABE VALLEY

TRES PINOS

SKAGGS SPRINGS

BICKMORE CANYON

MT HARLAN

PAICINES

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CUPERTINO

MERCY HOT SPRINGS

BICKMORE CANYON

TUMEY HILLS

.CALAVERAS RESERVOIR

WATSONVILLE EAST

MT JOHNSON

MT JOHNSON

CARMEL VALLEY

CHERRY PEAK

SAN BENITO

BICKMORE CANYON

ORTIGALITA PEAK

BICKMORE CANYON

TUMEY HILLS

BICKMORE CANYON

69

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CENTRAL CALIFORNIA EARTHQUAKES--1974 (CONTINUFD)

1974

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1974

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CENTRAL CALIFORNIA FARTHOUAKFS--1974 (CONTINUFD)

1 974

OC

T 26

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1 9

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79

CENTRAL CALIFORNIA EARTHOUA<ES--1974 (CONTINUFfO

1 9

74

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15 15 15 15 16 16 16 16 16 17

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CALAVERAS RESERVOIR

RICKMORE CANYON

SAN FELIPE

SAN JUAN BAUTISTA

SAN FELIPE

MT MADONNA

LOS GATOS

{ TOPO VALLEY

^ BICKMORE CANYON

i SAN BENITO

CHERRY PEAK

CERRO COLORADO

CALAVERAS RESERVOIR

LICK OBSERVATORY

SAN FELIPE

BICKMORE CANYON

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MONARCH PEAK

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THE GEYSERS

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