Dibblee (2002)

Morton & Miller (2006)

Ross (1969); AP Fault Zone (1974)

ApproximatelyLocated

AccuratelyLocated

Concealed

Fault TracesPlate 1a (to FER 251)

Previous fault mapping in the Mescal Creek quadrangle.

MESCAL CREEK

MOUNTSAN ANTONIO

EL MIRAGE

VALY

ERM

O

PHEL

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H PK1b

1a Dendochronological Dating Sample Sites - Jacoby (1988)

0 1 20.5Km

Morton & Miller (2006)

Ross (1969); AP Fault Zone (1974)

ApproximatelyLocated

AccuratelyLocated

Concealed

Fault Traces

Wrightwood Paleoseismic Site.SAF - San Andreas Fault (based on Trench Data)

Dendochronological Dating Sample Sites - Jacoby (1988)

0 1 20.5Km

Plate 1b (to FER 251)

Previous fault mapping in the Mount San Antonio quadrangle.

MESCAL CREEK

MOUNTSAN ANTONIO

EL MIRAGE

VALY

ERM

O

PHEL

AN

CRYS

TAL L

AKE

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H PK1b

1a

Trench

Inset figure from Scharer et al. (2007)

Imagery interpretation of geomorphic features related to recent faulting in the Mescal Creek quadrangle.

Fused imagery (MASTER & LiDAR)Illumination Source:90° & 26° Sun Azimuth45° Sun Elevation

Resolution: 0.5 m

Fault traces related to geomorphic features.

Plate 2a (to FER 251)

scarp modifiedby road

ponded alluvium

linear drainage

tonal lineament ?

vegetation contrast ?in young Qal

broad sidehill bench

vegetation contrast

shutter ridgelinear trough

closed depression,(sag pond)

break in slopeSW-facing scarp

beheadeddrainage

scarp in terrace

right-laterallydeflected drainage

linear trough1857?

right-laterallydeflected drainage

SW-facing scarpmodified by grading

?

?

???

?

right-laterallydeflected drainage

right-laterallydeflected drainage

detoeddrainage

linear ridge

linear drainagemodified by road grade

sidehill bench

break in slope orSW-facing scarp

in bedrock

linear trough or sidehill bench -

ridgetopspreading?

0 1 20.5Km

45°

Interpreted by Bryant & Perez (2007) and Perez & Bryant (this report) from the MASTER/LiDAR imagery.

1b2c2a

2b

3a

1a

3b

4a

4b

4c

5b5a

6

8a

7

8b 10

911a

11c

11e

11b

11d11f

12

21Fault feature number refers to description/attributionas discussed in the “Imagery Interpretation” section of the report.

MESCAL CREEK

MOUNTSAN ANTONIO

EL MIRAGE

VALY

ERM

O

PHEL

AN

CRYS

TAL L

AKE

TELE

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H PK2b

2a

Plate 2b (to FER 251)

Imagery interpretation of geomorphic features related to recent faulting in the Mount San Antonio quadrangle.

Fused imagery (MASTER & LiDAR)Resolution: 0.5 m

Illumination Source:90° & 26° Sun Azimuth45° Sun Elevation

0 1 20.5Km

linear trough, NE-facing scarp

linear ridge

vogue tonal lineament in Qal

tonal lineament,possible SW-facing scarp on young alluvial fan

possible SW-facing scarp, fluvially modified

tonal lineament,modified NE-facing scarp

vegetation contrastin young alluvial fan

modified NE-facing scarp

vegetation contrastin young Qal

closed depression(sag pond),artificial?

tonal lineament,possible NE-facing scarp in young Qal

closed depression(sag pond)

vegetation contrastin Holocene Qal

right-laterallydeflected drainage

right-laterally deflected streamchannel wall

right-laterallydeflected drainage

possible SW-facing

scarp

right-laterallydeflected drainage

sidehill bench

?

?

?

?

?

?

?

?

?

?

45°

south bound of pressure ridge?

MESCAL CREEK

MOUNTSAN ANTONIO

EL MIRAGE

VALY

ERM

O

PHEL

AN

CRYS

TAL L

AKE

TELE

GRAP

H PK2b

2a

Fault traces related to geomorphic features.

16

14

17a17b

18a19a

20a

20b

13h

13f

13g

18b

19b

13a 15a

15b

13d13b

13e

13c

21Fault feature number refers to description/attributionas discussed in the “Imagery Interpretation” section of the report.

Interpreted by Bryant & Perez (2007) and Perez & Bryant (this report) from the MASTER/LiDAR imagery.

Plate 3a (to FER 251)

Fault traces recommended for inclusion in the revised EFZ of the Mescal Creek 7.5-minute quadrangle.

MESCAL CREEK

MOUNTSAN ANTONIO

EL MIRAGE

VALY

ERM

O

PHEL

AN

CRYS

TAL L

AKE

TELE

GRAP

H PK3b

3aRecommended Alquist-Priolo Earthquake Fault Zone

1974 Alquist-Priolo Earthquake Fault Zone

Faults mapped by Ross (1969) based on photo interpretation of 1966 APs. Approximately

LocatedAccurately

Located Concealed

Fault Traces

These faults will be spatially modified to conform with the more accurately located fault traces of Perez & Bryant.

Inferred

? ?

Area not evaluated

Area not evaluated

0 1 20.5Km

Area outside Imagery Coverage not evaluated

Fault traces Interpreted by Bryant & Perez (2007) and Perez & Bryant (this report) from the MASTER/LiDAR imagery.

Plate 3b (to FER 251)

Fault traces recommended for inclusion in the revised EFZ of the Mount San Antonio 7.5-minute quadrangle.

MESCAL CREEK

MOUNTSAN ANTONIO

EL MIRAGE

VALY

ERM

O

PHEL

AN

CRYS

TAL L

AKE

TELE

GRAP

H PK

0 1 20.5Km

3b

3aRecommended Alquist-Priolo Earthquake Fault Zone

1974 Alquist-Priolo Earthquake Fault Zone

Faults mapped by Ross (1969) based on photo interpretation of 1966 APs. Approximately

LocatedAccurately

Located Concealed

Fault Traces

These faults will be spatially modified to conform with the more accurately located fault traces of Perez & Bryant.

Inferred

Fault traces Interpreted by Bryant & Perez (2007) and Perez & Bryant (this report) from the MASTER/LiDAR imagery.

Area not evaluated

Area not evaluated

Area outside Imagery Coverage not evaluated