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

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Taipei

T'aichung

T'ainanKaoshsiung

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_̂

China

Laos

Cambodia

Vietnam

Thailand

ParacelIs.

SpratlyIs.

JapanSouthKorea

Taiwan

PhilippinesSouthChinaSea

Sulu Sea

SibuyanSea

PhilippineSea

EastChinaSea

YellowSea

130°

130°

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110°

110°

30° 30°

20° 20°

10° 10°

M6.2 Taiwan Earthquake of 02 June 2013

0 250 500125Kilom e te rs

_̂

China

Laos

Cambodia

Vietnam

Thailand

ParacelIs.

SpratlyIs.

JapanSouthKorea

Taiwan

Philippines

130°

130°

120°

120°

110°

110°

30° 30°

20° 20°

0 500 1,000 1,500 2,000250Kilom e te rs

Prepared in cooperation with the Global Seismographic Network

Tectonic Setting

Seismic Hazard

Epicentral Region

TECTON IC SUMMARYThe June 2, 2013 M 6.2 e a rthqua ke s outhe a s t of Buli, Ta iwa n,occurre d a s the re s ult of thrus t or re ve rs e fa ulting within the crus t ofce ntra l Ta iwa n. The is la nd of Ta iwa n s its a t the com ple x pla teb ound a ry b e twe e n the Philippine a nd Eura s ia te ctonic pla te s . At thela titud e of the June 2 e a rthqua ke , the Philippine a nd Eura s ia pla te sa re conve rg ing a t a ra te of a pproxim a te ly 78 m m /yr. The June 2e a rthqua ke is a s s ocia te d with this b roa d -s ca le conve rg e nce ,re fle cting fa ulting b e ne a th the thicke ne d Ce ntra l Mounta in Ra ng e .The June 2, 2013 e a rthqua ke is loca te d jus t 10 km to the e a s t of theSe pte m b e r 1999 M 7.7 Chi-Chi e a rthqua ke , the la rg e s t inla nde a rthqua ke in Ta iwa n in the 20th ce ntury, a nd a n e ve nt which ca us e dm a jor d a m a g e a nd a pproxim a te ly 2,400 fa ta litie s . Prior to the 1999e a rthqua ke , m uch of the s e is m icity in Ta iwa n ha d b e e n conce ntra te da long the e a s t coa s t of the is la nd ; s ince , howe ve r, the Chi-Chie a rthqua ke a nd its a fte rs hock s e que nce ha ve d e line a te d a s e rie s offa ulting s tructure s throug h the ce nte r of the is la nd tha t m a rk thewe s te rn b ound a ry of the thicke ne d a nd uplifte d Ce ntra l Mounta inRa ng e . The June 2 e a rthqua ke , like the Chi-Chi e ve nt b e fore it, islike ly a s s ocia te d with fa ulting in this we s te rn b ound a ry re g ion. Thed e pth a nd fa ulting m e cha nis m of the June 2, 2013 e a rthqua ke im plye ithe r s lip on a thrus t fa ult s triking a pproxim a te ly north-s outh a ndd ipping s ha llowly to the e a s t (cons is te nt with inte rpre ta tions of the1999 Chi-Chi m a ins hock), or on a m ore s te e ply we s t-d ipping , re ve rs e -fa ulting s tructure (cons is te nt with inte rpre ta tions of s om e a fte rs hocksof the Chi-Chi e ve nt).

EXPLANATIONEarthquake Magnitude

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

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

!( 70 - 299

!( ≥ 300# Sub d uction

Tra ns formDive rg e ntOthe rs

Slab Contours (Depth)0 - 120 (20 km inte rva ls )160 - 360 (40 km inte rva ls )400 - 560 (40 km inte rva ls )600 + (40 km inte rva ls )

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.

EXPLANATIONMa in Sh o c kMa in Sh o c k

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

Pla te Bound a ry# Sub d uction

Tra ns formDive rg e ntOthe rs

Volca noe s#*

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

Significant Earthquakes Mag >= 7Y e a r Mon Da y Tim e La t Long De p Ma g1906 04 13 1918 23.600 120.400 5 7.11906 06 19 1122 20.000 122.000 60 7.11906 10 17 0940 19.000 121.000 60 7.31909 04 14 1953 25.000 122.500 5 7.11909 11 21 0736 25.500 122.000 5 7.31910 04 12 0022 25.000 123.000 200 7.61910 09 01 0045 21.000 122.000 0 7.01910 11 14 0734 24.500 122.000 0 7.01915 01 05 2326 25.100 123.300 150 7.31915 02 28 1859 23.600 123.500 0 7.71916 08 28 0727 23.900 120.500 5 7.21917 07 04 0038 25.000 123.000 0 7.21917 07 04 0536 25.000 123.000 0 7.21918 02 13 0607 23.540 117.243 15 7.21919 06 01 0651 27.074 123.315 35 7.11919 12 20 1933 22.500 122.500 35 7.11919 12 20 2037 23.536 121.212 35 7.01920 06 05 0421 23.813 122.080 35 7.91921 04 02 0936 23.000 123.000 35 7.21922 09 01 1916 24.506 122.040 35 7.51922 09 14 1931 24.378 122.644 35 7.11925 04 16 1952 21.798 121.111 35 7.11926 06 29 1427 26.986 127.473 142 7.41930 12 21 1451 19.986 121.585 35 7.01934 02 14 0359 17.404 119.190 35 7.51935 04 20 2202 24.364 120.613 35 7.11935 09 04 0137 22.259 121.257 35 7.11935 12 17 1917 22.525 125.747 25 7.11936 08 22 1109 21.949 121.186 35 7.21937 12 08 0832 22.872 121.010 38.8 7.0

1938 05 23 0821 18.053 119.994 35 7.01938 06 10 0953 25.208 125.115 35 7.61938 09 07 0403 23.737 121.408 47.4 7.01938 12 06 2300 22.614 121.398 39 7.01941 12 16 1919 23.251 120.391 35 7.11947 09 26 1601 24.750 123.000 110 7.41948 03 03 0909 18.500 119.000 0 7.11949 12 29 0303 18.000 121.000 0 7.21951 10 21 2134 23.750 121.500 0 7.51951 10 22 0329 23.750 121.250 0 7.21951 10 22 0428 23.900 121.700 0 7.01951 10 22 0543 24.000 121.250 0 7.11951 11 24 1850 23.000 122.500 0 7.31957 02 23 2026 23.917 121.517 56.8 7.21958 03 11 0026 24.433 124.351 109 7.21959 04 26 2040 24.687 122.792 126 7.51959 08 15 0857 21.952 120.970 25 7.21963 02 13 0850 24.356 122.060 35 7.31966 03 12 1631 24.307 122.695 28.9 7.41967 10 25 0059 24.464 122.221 67.1 7.01968 02 26 1050 22.762 121.414 16.2 7.21972 01 25 0206 22.549 122.325 10.1 7.51972 01 25 0341 23.037 122.118 11.9 7.01975 05 23 1601 22.753 122.567 17.9 7.01978 07 23 1442 22.243 121.419 39.2 7.31978 12 23 1123 23.224 122.015 48 7.01986 11 14 2120 23.989 121.731 34 7.41998 05 03 2330 22.430 125.375 25.4 7.51999 09 20 1747 23.819 120.863 21 7.72002 03 31 0652 24.315 122.179 41.1 7.42006 12 26 1226 21.799 120.547 10 7.1

Pe a k Ground Acce le ra tion in m /s e 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 Center03 June 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.

M6.2 Taiwan Earthquake of 02 June 2013 02 June 2013 5:43:04 UTC 23.794° N., 121.082° E.Depth 20 kmMw = 6.2 (USGS)

EARTHQUAKE SUMMARY MAP

PACIFIC PLATE

PAGER

Pacific Ocean

South China Sea

EURASIA PLATE

Taiwan

Did You Feel It?

A

B

China

Philippines