U.S. DEPARTMENT OF THE INTERIORU.S. GEOLOGICAL SURVEY

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_̂

UnitedStates

BeringSea

PacificOcean

160°

160°

170°

170°

180°

180°

60° 60°

50° 50°

M7.0 Aleutian Islands, Alaska Earthquake of 30 August 2013

0 250 500125Kilom e te rs

_̂

160°

160°

170°

170°

180°

180°

60° 60°

50° 50°

0 500 1,000 1,500250Kilom e te rs

Prepared in cooperation with the Global Seismographic Network

Tectonic Setting

Seismic Hazard

Epicentral Region

TECTONIC SUMMAR YTh e Aug ust 30, 2013 M 7.0 e arth quake south e ast of Adak, Alaska, occurre d as th e re sult ofth rust faulting on or ne ar th e subduction zone inte rface be twe e n th e Pacific and NorthAm e rica plate s. At th e location of th is e ve nt, th e Pacific plate m ove s towards th e north we stwith re spe ct to North Am e rica at a rate of approxim ate ly 73 m m /yr, be g inning its de sce nt intoth e m antle at th e Ale utian tre nch approxim ate ly 130 km south of th e Aug ust 30 e arth quake .Th e de pth and m e ch anism of th is e arth quake are consiste nt with it occurring along th em e g ath rust inte rface be twe e n th e se two plate s.Th e Ale utians Arc is fam iliar with larg e e arth quake s –two-doze n e ve nts of M 6.5 or larg e rh ave occurre d ove r th e last ce ntury with in 250 km of th e Aug ust 30 e arth quake . Th e larg e stof th e se was an Mw 8.6 e arth quake in March of 1957, wh ose h ypoce nte r was locate d just 15km south of th e Aug ust 30 e arth quake . Afte rsh ocks associate d with th e 1957 e ve nt e xte nde dfor m ore th an 1000 km along th e arc, roug h ly from th e Inte rnational Date line in th e we st toUnim ak Island in th e e ast. Th e 1957 e arth quake also re sulte d in a larg e tsunam i th at wasobse rve d th roug h out th e Pacific Basin, and cause d dam ag e locally along th e Ale utian Arcand in Hawaii. Oth e r larg e ne arby e ve nts include th e May 1986 Mw 8.0 e arth quake 40 km toth e south e ast, and th e June 1996 Mw 7.9 e arth quake 150 km to th e we st. Ne ith e r of th e sem ore re ce nt e ve nts are known to h ave cause d fatalitie s or sig nificant dam ag e .

EXPLANATIONEarthquake Magnitude

( 5.50 - 5.99( 6.00 - 6.99( 7.00 - 7.99

( ≥ 8.00Earthquake Depth (km)!( 0 - 69

!( 70 - 299

!( ≥ 300# Subduction

TransformDive rg e ntOth e rs

Seismic hazard is expressed as peakground acceleration (PGA) on firmrock, in meters/sec², expected to beexceeded in a 50-yr period with aprobability of 10 percent.

EXPLANATIONMai n Sh o ckMai n Sh o ck

_̂Mag ≥ 7.0 !( 0 - 69 km!( 70 - 299!( 300 - 600

Plate Boundary# Subduction

TransformDive rg e ntOth e rs

Volcanoe s#*

0 500 1,000 1,500250Kilom e te rs

Significant Earthquakes Mag >= 7.5Ye ar Mon Day Tim e Lat Long De p Mag1900 01 31 1922 48.000 146.000 450 7.51904 06 25 1445 52.000 159.000 0 7.51904 06 25 2100 52.000 159.000 0 7.61905 07 09 0940 49.000 99.000 0 8.41905 07 23 0246 49.000 98.000 0 8.41906 08 17 0010 51.000 179.000 0 7.81913 08 01 1710 47.500 155.500 0 7.71915 05 01 0500 47.500 154.500 35 7.91915 07 31 0131 54.000 162.000 0 7.51916 02 06 2151 48.500 178.500 0 7.71917 05 31 0847 54.500 -160.000 0 7.51923 02 03 1601 53.853 160.761 35 8.51929 03 07 0134 50.786 -169.524 25 7.81929 12 17 1058 53.783 171.512 35 7.71938 11 10 2018 55.328 -158.370 35 8.21946 06 23 1713 49.750 -124.500 0 7.61949 08 22 0401 53.750 -133.250 0 8.11952 11 04 1658 52.755 160.057 22.2 9.01957 03 09 1422 51.556 -175.392 30 8.6

1959 05 04 0715 53.351 159.645 35 8.01965 02 04 0501 51.209 178.499 30.1 7.51965 02 04 0840 51.397 179.560 8.2 7.81965 03 30 0227 50.314 177.935 20 7.71986 05 07 2247 51.557 -174.813 28.2 8.01993 06 08 1303 51.203 157.736 71 7.51996 06 10 0403 51.613 -177.615 28 7.91997 12 05 1126 54.799 162.003 36.1 7.82003 11 17 0643 51.146 178.650 33 7.82008 07 05 0212 53.882 152.886 632 7.72012 08 14 1102 49.800 145.064 583 7.72013 01 05 0858 55.394 -134.650 10 7.5

Pe ak Ground Acce le ration in m /se c**2

.2 .4 .8 1.6 2.4 3.2 4.0 4.8

Epicentral Region

_̂

Epicentral Region

DATA SOURCESEARTHQUAKES AND SEISMIC HAZARD USGS, National Earthquake Information Center NOAA, National Geophysical Data Center IASPEI, Centennial Catalog (1900 - 1999) and extensions (Engdahl and Villaseñor, 2002)EHB catalog (Engdahl et al., 1998)HDF (unpublished earthquake catalog, Engdahl, 2003)Global Seismic Hazard Assessment ProgramPLATE TECTONICS AND FAULT MODELPB2002 (Bird, 2003)Ji, C., D.J. Wald, and D.V. Helmberger, Source description of the 1999 Hector Mine, California earthquake; Part I: Waveletdomain inversion theory and resolution analysis, Bull. Seism. Soc. Am., Vol 92, No. 4. pp. 1192-1207, 2002.DeMets, C., Gordon, R.G., Argus, D.F., 2010.Geologically current plate motions, Geophys. J. Int. 181, 1-80.BASE MAPNIMA and ESRI, Digital Chart of the WorldUSGS, EROS Data CenterNOAA GEBCO and GLOBE Elevation Models

DISCLAIMER

Base map data, such as place names and political boundaries, are the best available but may not be current or may contain inaccuracies and therefore should not be regarded as having official signifiance.Map updated by U.S. Geological Survey National Earthquake Information Center30 August 2013http://earthquake.usgs.gov/Map not approved for release by Director USGS

REFERENCESBird, P., 2003, An updated digital model of plate boundaries: Geochem. Geophys. Geosyst., v. 4, no. 3, pp. 1027-80.

Engdahl, E.R., and Villasenor, A., 2002, Global Seismicity: 1900-1999, chap. 41 of Lee, W.H.K., and others, eds., International Earthquake and Engineering Seismology, Part A: New York, N.Y.,Elsevier Academic Press, 932 p.Engdahl, E.R., Van der Hilst, R.D., and Buland, R.P.,1998, Global teleseismic earthquake relocation with improved travel times and procedures for depth determination;Bull. Seism. Soc. Amer., v. 88, p. 722-743.

M7.0 Aleutian Islands, Alaska Earthquake of 30 August 2013 30 August 2013 16:25:02 UTC 51.61° N., 175.361° W.Depth 34 kmMw = 7 (USGS)

EARTHQUAKE SUMMARY MAP

PAGER

ShakeMap

PACIFIC PLATE

NORTH AMERICA PLATE