U.S. DEPARTMENT OF THE INTERIOR EARTHQUAKE …18 June 2008 Map not approved for release by Director...
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Map prepared by U.S. Geological Survey National Earthquake Information Center 18 June 2008 Map not approved for release by Director USGS EARTHQUAKE SUMMARY MAP XXX U.S. DEPARTMENT OF THE INTERIOR U.S. GEOLOGICAL SURVEY 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 significance. Japan Basin Hokkaido J AP A N T R E N CH 2003 Kinki Kanto Chubu Tohoku Hokkaido Gifu Aomori Osaka Kyoto Nagoya Yokohama Sendai Sapporo Tokyo 1968 1952 1933 1995 1994 1993 1993 1989 1984 1983 1982 1981 1978 1974 1974 1971 1968 1968 1968 1968 1965 1964 1962 1961 1960 1959 1953 1952 1952 1948 1945 1943 1939 1939 1938 1938 1938 1938 1938 1938 1937 1936 1935 1935 1933 1931 1928 1927 1924 1924 1923 1923 1923 1923 1923 1923 1923 1921 1919 1917 1917 1916 1915 1915 1915 1915 1915 1914 1913 1909 1909 1908 1906 1906 1905 1904 1902 1901 1901 1901 1900 Owase KAINAN KOYASAN WAKAYAMA Hashimoto FUKE IZUMI- SANO NAGANO KISHIWADA ISE SAKURAI MATSUZAKA KOKUBU OSAKA AKASHI KOBE NARA ARAI TOYOHAMA TSU HAMAMATSU TOYOHASHI MATSUZAKI UENO KAKEOAWA TOYONAKA IKEDA MIKI SHIMADA AKUTAGAWA Seki YAIZU NISHIO FUJIEDA Sanda TOKONAME HANDA CHIKURA OKAZAKI YOKKAICHI ITO SHIZUOKA TATEYAMA KARIYA OTSU KYOTO HINO SHIMIZU KUSATSU SASAYAMA TOYOTA ATAMI NUMAZU Kamogawa KATADA MISHIMA Misaki NAGOYA YOSHIWARA ECHIGAWA SETO FUJINOMIYA OHARA ODAWARA YOKOSUKA HIKONE OKOSHI FUKUCHIYAMA FUJISAWA HIRATSUKA TAJIMI OGAKI KISARAZU GIFU MOBARA MAIZURU OI HIGASHI- MAIZURU SEKI FUJI- YOSHIDA KINOMOTO IIDA KATAKAI Miyazu Mino IWATAKI AOYAGI CHIBA NARUTO KOFU HACHIOJI AMINO TOKYO ENZAN SAKURA Asahi Yokaichiba AKAHO TAKO CHOSHI HACHIMAN ICHIKAWA HANNO OMIGAWA TAKEFU Ryugaski OMIYA KAWAGOE NODA SABAE Chino SUWA FUKUI OKAYO TAKAYAWA Ishioka KUMAGAYA KOGA MATSUMOTO FURUKAWA Tomioka ISEZAKI SHIMODATE TAKASAKI FUNATSU ASHIKAGA KARUIZAWA Kasama MAEBASHI KOMATSU UEDA KIRYU KUJI Omachi UTSUNMIYA MATSUSHIRO KANAZAWA FUKUNO HITACHI Numata SUZAKA NAGANO KARASUYAMA ISURUGI TOYAMA TAKAOKA Nikko TAKAMATSU FUSHIKI UOZU Liyama HIMI UEDA ONAHAMA TAIRA NANAO TAKADA Shirakawa TOGI KASHIWAZAKI KORIYAMA NAGAOKA WAKAMATSU SANJO Kamo Gosen FUKUSAIMA MAKI NIITSU KAMEDA YONEZAWA NIIGATA SHIBATA Murakami YAMAGATA SENDAI SHIOGAMA ISHINOMAKI WAKUYA FURUKAWA SANUMA TSURUOKA Shinjo SAKATA ICHINOSEKI MIZUSAWA KAMAISHI HANAMAKI MIYAKO MORIOKA AKITA NOSHIRO ODATE HACHINOHE HIROSAKI Sambongi AJIGASAWA AOMORI NOHEJI HAKODATE MURORAN DATE TOMAKOMAI CHITOSE KUTCHAN SHIRANUKA KUSHIRO IWANAI KURIYAMA SAPPORO YUBARI 144° 144° 142° 142° 140° 140° 138° 138° 136° 42° 42° 40° 38° 38° 36° 36° 34° K URI L - K A M CHA T K A TR E N C H J A PA N T R EN C H I Z U T R E N C H A N S E I - SH O T O (RY UKY U ) TR E N C H OKHOTSK PLATE AMUR PLATE OKINAWA PLATE PACIFIC PLATE EAST CHINA SEA YELLOW SEA SEA OF JAPAN K u ril I sl a nd s JAPAN NORTH KOREA SOUTH KOREA Northwest Pacific Basin Shatsky Rise K u r il Ba s i n Japan Basin CHINA Birobidzhan Gifu Shimonoseki Naha Nagasaki Cheju Matsuyama Ch'ungju Ch'unch'on Kaesong Haeju Hamhung Sinuiju Aomori Kanggye Ch'ongjin Yuzhno- Sakhalinsk Blagoveshchensk Taegu Kwangju Pusan Taipei Hangzhou Fukuoka Kita Kyushu Hiroshima Osaka Kobe Kyoto Nagoya Yokohama Kawasaki Chonju Qingdao Taejon Inch`on Sendai P'yongyang Dalian Anshan Shenyang Fushun Sapporo Vladivostok Jilin Changchun Harbin Qiqihar Khabarovsk Seoul Shanghai Tokyo 160° 160° 150° 150° 140° 140° 130° 130° 50° 50° 40° 30° 30° M6.9 Northern Honshu, Japan Earthquake of 13 June 2008 0 200 400 100 Kilometers Birobidzhan Gifu Shimonoseki Nagasaki Cheju Matsuyama Ch'ungju Ch'unch'on Kaesong Haeju Wonsan Hamhung Sinuiju Aomori Kanggye Ch'ongjin Yuzhno- Sakhalinsk Blagoveshchensk Taegu Kwangju Pusan Fukuoka Kita Kyushu Hiroshima Osaka Kobe Kyoto Nagoya Yokohama Kawasaki Chonju Taejon Inch`on Sendai P'yongyang Dalian Anshan Shenyang Fushun Sapporo Vladivostok Jilin Changchun Harbin Qiqihar Khabarovsk Seoul Shanghai Tokyo 160° 160° 150° 150° 140° 140° 130° 130° 50° 50° 40° 40° 30° 30° DATA SOURCES EARTHQUAKES AND SEISMIC HAZARD USGS, National Earthquake Information Center NOAA, National Geophysical Data Center IASPEI, Centennial Catalog (1900 - 1999) and extensions (Engdahl and Villaseñor, 2002) HDF (unpublished earthquake catalog) (Engdahl, 2003) Global Seismic Hazard Assessment Program PLATE TECTONICS AND FAULT MODEL PB2002 (Bird, 2003) Finite Fault Model, Chen Ji, UC Santa Barbara (2007) BASE MAP NIMA and ESRI, Digital Chart of the World USGS, EROS Data Center NOAA GEBCO and GLOBE Elevation Models 0 400 800 1,200 1,600 200 Kilometers Scale Prepared in cooperation with the Global Seismographic Network Tectonic Setting Seismic Hazard Epicentral Region Honshu Earthquake 13 June 2008 23:42:46 UTC 39.122° N., 140.678° E. Depth 10 km Mw = 6.9 (USGS) An earthquake occurred about 85 km (50 miles) SSE of Akita, Honshu, Japan or about 100 km (60 miles) NNW of Sendai, Honshu, Japan or about 390 km (240 miles) N of TOKYO, Japan at 5:43 PM MDT, Jun 13, 2008 (Jun 14 at 8:43 AM local time in Japan). Shaking was felt over a wide region. Ten deaths and 236 injuries were reported. TECTONIC SUMMARY The Mw 6.9 Honshu earthquake of June 13th 2008 occurred in a region of convergence between the Pacific Plate and the Okhotsk section of the North American Plate in northern Japan, where the Pacific plate is moving west- northwest with respect to North America at a rate of approximately 8.3 cm/yr. The hypocenter of the earthquake indicates shallow thrusting motion in the upper (Okhotsk) plate, above the subducting Pacific plate, which lies at approximately 80 km depth at this location. The earthquake occurred in a region of upper- plate contraction, probably within the complicat- ed tectonics of the Ou Backbone Range, known to have hosted several large earth- quakes in historic times. The largest of these events occurred in 1896, approximately 70km north of the June 13th event, and killed over 200 people in the local area. Seismic hazard is expressed as peak ground acceleration (PGA) on firm rock, in meters/sec², expected to be exceeded in a 50-yr period with a probability of 10 percent. EXPLANATION Main Shock M6.8 Mag ≥ 7.0 0 - 69 km 70 - 299 300 - 600 Plate Boundaries Subduction Transform Divergent Convergent Volcanoes RELATIVE PLATE MOTIONS Plate boundary symbols indicate the general pattern of relative plate motion. The Pacific Plate, however, is moving west-northwest relative to the Okhotsk Plate at approximately 8.3 cm/yr. 0 400 800 1,200 1,600 200 Kilometers Scale REFERENCES Bird, P., 2003, An updated digital model of plate boundaries: Geochem. Geophys. Geosyst., v. 4, no. 3, pp. 1027- 80. Engdahl, E.R. and Villaseñor, 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 Academeic Press, 932 p. Engdahl, E.R., Van der Hilst, R.D., and Buland, R.P., 1998, Global teleseismic earthquake relocation with improved trav- el times and procedures for depth determination: Bull. Seism. Soc. Amer., v. 88, p. 722-743. Scale 1:4,000,000 Finite Fault Model for M6.8 Earthquake Significant Earthquakes Mag >= 7.5 Year Mon Day Time Lat Long Dep Mag 1896 08 31 1706 39.500 140.700 0 7.2 1901 08 09 1833 40.600 142.300 35 7.5 1906 01 21 1349 34.000 137.000 350 7.7 1909 03 13 1429 34.500 141.500 35 7.6 1915 11 01 0724 38.300 142.900 35 7.5 1923 09 01 0258 35.405 139.084 35 7.9 1923 09 02 0246 34.900 140.200 35 7.6 1931 03 09 0348 40.484 142.664 35 7.7 1933 03 02 1731 39.224 144.622 35 8.4 1938 05 23 0718 36.458 141.755 35 7.7 1938 11 05 0843 37.009 142.045 35 7.9 1938 11 05 1050 37.108 142.081 35 7.8 1938 11 06 0853 37.287 142.283 35 7.7 1944 12 07 0435 33.750 136.000 0 8.1 1952 03 04 0122 42.500 143.000 0 8.1 1953 11 25 1748 34.034 141.786 35 7.9 1960 03 20 1707 39.871 143.435 2.1 7.8 1964 06 16 0401 38.434 139.226 13.1 7.5 1968 05 16 0049 40.903 143.346 25.8 8.3 1968 05 16 1039 41.593 142.786 11.8 7.8 1978 06 12 0814 38.224 142.009 53.3 7.7 1983 05 26 0300 40.468 139.080 20 7.7 1993 01 15 1106 43.022 144.124 102 7.6 1993 07 12 1317 42.883 139.225 20.4 7.7 1994 12 28 1219 40.530 143.403 29.2 7.8 Peak Ground Acceleration in m/sec**2 .2 .4 .8 1.6 2.4 3.2 4.0 4.8 Sea of Japan EPICENTRAL REGION Pacific Ocean EXPLANATION Earthquake Magnitude 5.50 - 5.99 6.00 - 6.99 7.00 - 7.99 8.00 - 8.99 9.00 - 9.99 Earthquake Depth 0 - 69 70 - 299 300 - 700 FINITE FAULT MODEL Contributed by Gavin Hayes, NEIC and Chen Ji, University of California at Santa Barbara Distribution of the amplitude and direction of slip for subfault elements (small rectangles) of the fault rupture model are determined from the inversion of teleseismic body waveforms. Arrows indicate the amplitude and direction of slip (of the hanging wall with respect to the foot wall); the slip amount is also color-coded as shown. The view of the rupture plane is from above. The strike of the fault rupture plane is N25E and the dip is 49.67 NW. The dimensions of the subfault elements are 3 km in the strike direction and 2 km in the dip direction. The seismic moment released based on the plane is 2.466 E+26 dyne.cm. 1:20,000,000 1:20,000,000 EPICENTRAL REGION Did You Feel It? Distance along strike 205° (N 155° W) (km) Distance downdip (km) Dip 49.67° Northwest 0 -22 0 -19 23 Slip (cm) 0 - 50 50 - 100 100 - 150 150 - 200 200 - 250 250 - 300 300 - 350 350 - 400 400 - 450 450 - 500 500 - 550
Transcript of U.S. DEPARTMENT OF THE INTERIOR EARTHQUAKE …18 June 2008 Map not approved for release by Director...
Map prepared by U.S. Geological SurveyNational Earthquake Information Center18 June 2008Map not approved for release by Director USGS
EARTHQUAKE SUMMARY MAP XXXU.S. DEPARTMENT OF THE INTERIORU.S. GEOLOGICAL SURVEY
DISCLAIMERBase map data, such as place names and politicalboundaries, are the best available but may not be current or may contain inaccuracies and thereforeshould not be regarded as having official significance.
J a p a nB a s i n
Hokkaido
JAP A
N T R
E NC H
2003
Kinki
Kanto
Chubu
Tohoku
Hokkaido
Gifu
Aomori
Osaka
Kyoto Nagoya
Yokohama
Sendai
Sapporo
Tokyo
1968
1952
1944
1933
1995
1994
19931993
1989
1984
1983
1982
1981
1978
1974
1974
1971
1968
1968
1968
1968
1965
1964
1962
1961
1960
1959
1953
1952
1952
1948
1945
1943
1939
1939
19381938
1938
19381938
1938
1937
1936
19351935
1933
1931
1928
1927
1924
1924
1923
1923
1923
1923
1923
1923
1923
1921
19191917
1917
1916
1915
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1915
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1915
1914
1913
19091909
1908
19061906
1905
1904 1902
19011901
1901
1900
SHINGUTANABE
GoboOwaseKAINAN
KOYASANWAKAYAMA
HashimotoFUKE IZUMI-
SANO
NAGANOKISHIWADA ISESAKURAI MATSUZAKAKOKUBU
OSAKAAKASHIKOBE NARA
ARAITOYOHAMATSU HAMAMATSU
TOYOHASHI MATSUZAKIUENO
KAKEOAWATOYONAKAIKEDAMIKISHIMADAAKUTAGAWA
Seki YAIZUNISHIOFUJIEDASanda
TOKONAMEHANDACHIKURA
OKAZAKIYOKKAICHI ITOSHIZUOKA TATEYAMA
KARIYAOTSU
KYOTO HINO SHIMIZUKUSATSUSASAYAMA TOYOTAATAMINUMAZU Kamogawa
KATADAMISHIMA Misaki
NAGOYA YOSHIWARAECHIGAWA SETO FUJINOMIYA OHARAODAWARA YOKOSUKA
HIKONE OKOSHIFUKUCHIYAMA FUJISAWAHIRATSUKATAJIMIOGAKI KISARAZU
GIFUMOBARAMAIZURU
OIHIGASHI-MAIZURU
SEKI FUJI-YOSHIDA
KINOMOTO IIDAKATAKAI
MiyazuMinoIWATAKI AOYAGI CHIBANARUTOKOFU HACHIOJIAMINO
TOKYOENZAN
SAKURA AsahiYokaichiba
AKAHO TAKO CHOSHIHACHIMAN ICHIKAWA
HANNO OMIGAWATAKEFU RyugaskiOMIYAKAWAGOE NODASABAE ChinoSUWAFUKUI OKAYOTAKAYAWA IshiokaKUMAGAYA KOGA
MATSUMOTOFURUKAWA Tomioka ISEZAKI SHIMODATETAKASAKIFUNATSU ASHIKAGAKARUIZAWA
KasamaMAEBASHIKOMATSU UEDA KIRYU KUJIOmachi UTSUNMIYAMATSUSHIRO
KANAZAWA FUKUNO HITACHINumataSUZAKANAGANO KARASUYAMAISURUGI TOYAMATAKAOKA
NikkoTAKAMATSU FUSHIKI UOZU LiyamaHIMI UEDA ONAHAMATAIRANANAO TAKADA ShirakawaTOGI
KASHIWAZAKI KORIYAMANAGAOKA WAKAMATSUSANJO
Kamo GosenFUKUSAIMAMAKI NIITSU
KAMEDAYONEZAWANIIGATA SHIBATA
Murakami YAMAGATA SENDAISHIOGAMA ISHINOMAKI
WAKUYAFURUKAWA
SANUMATSURUOKA Shinjo
SAKATA ICHINOSEKI
MIZUSAWAKAMAISHI
HANAMAKI
MIYAKOMORIOKAAKITA
NOSHIRO ODATE
HACHINOHEHIROSAKI Sambongi
AJIGASAWAAOMORI
NOHEJI
HAKODATE
MURORANDATE
TOMAKOMAI
CHITOSEKUTCHAN SHIRANUKA
KUSHIROIWANAI KURIYAMASAPPORO YUBARI
144°
144°
142°
142°
140°
140°
138°
138°
136°
136°
42° 42°
40° 40°
38° 38°
36° 36°
34° 34°
K U R I L -
K AM C H ATK A TR E N C H
J A PAN
T RE N
C H
IZ U T R E NCH
N A N S E I - S
H O TO ( RY U K Y U ) T
R E N C H
OKHOTSKPLATE
AMUR PLATE
OKINAWAPLATE
PACIFIC PLATEE A S T
C H I N AS E A
Y E L L O WS E A
S E A O F J A P A N
Kuril Is la
nds
J A P A N
N O R T HK O R E A
S O U T HK O R E A
N o r t h w e s tP a c i f i cB a s i n
S h at s
k y R
i se
K u r i l B a s i n
J a p a nB a s i n
CHINABirobidzhan
Gifu
Shimonoseki
Naha
NagasakiCheju Matsuyama
Ch'ungjuCh'unch'on
KaesongHaeju
HamhungSinuijuAomoriKanggye
Ch'ongjin
Yuzhno-Sakhalinsk
Blagoveshchensk
TaeguKwangjuPusan
Taipei
Hangzhou
FukuokaKitaKyushu
HiroshimaOsaka
KobeKyoto
Nagoya YokohamaKawasakiChonju
Qingdao TaejonInch`on
SendaiP'yongyangDalian
Anshan ShenyangFushunSapporoVladivostokJilin
Changchun
Harbin
QiqiharKhabarovsk
Seoul
Shanghai
Tokyo
160°
160°
150°
150°
140°
140°
130°
130°
50° 50°
40° 40°
30° 30°
M6.9 Northern Honshu, Japan Earthquake of 13 June 2008
0 200 400100Kilometers
Birobidzhan
Gifu
Shimonoseki
NagasakiCheju Matsuyama
Ch'ungjuCh'unch'on
KaesongHaejuWonsan
HamhungSinuijuAomoriKanggye
Ch'ongjin
Yuzhno-Sakhalinsk
Blagoveshchensk
TaeguKwangju Pusan
Fukuoka KitaKyushu
Hiroshima Osaka KobeKyoto Nagoya YokohamaKawasakiChonju
TaejonInch`on
SendaiP'yongyangDalian
AnshanShenyang Fushun
SapporoVladivostokJilinChangchun
Harbin
QiqiharKhabarovsk
Seoul
Shanghai
Tokyo
160°
160°
150°
150°
140°
140°
130°
130°
50° 50°
40° 40°
30° 30°
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) HDF (unpublished earthquake catalog) (Engdahl, 2003) Global Seismic Hazard Assessment ProgramPLATE TECTONICS AND FAULT MODEL PB2002 (Bird, 2003) Finite Fault Model, Chen Ji, UC Santa Barbara (2007)BASE MAP NIMA and ESRI, Digital Chart of the World USGS, EROS Data Center NOAA GEBCO and GLOBE Elevation Models
0 400 800 1,200 1,600200Kilometers
Scale
Prepared in cooperation
with the Global Seismographic
Network
Tectonic Setting
Seismic Hazard
Epicentral Region
Honshu Earthquake 13 June 2008 23:42:46 UTC 39.122° N., 140.678° E.Depth 10 kmMw = 6.9 (USGS) An earthquake occurred about 85 km (50 miles) SSE of Akita, Honshu, Japan or about 100 km (60 miles) NNW of Sendai, Honshu, Japan or about 390 km (240 miles) N of TOKYO, Japan at 5:43 PM MDT, Jun 13, 2008 (Jun 14 at 8:43 AM local time in Japan). Shaking was felt over a wide region. Ten deaths and 236 injuries were reported.
TECTONIC SUMMARYThe Mw 6.9 Honshu earthquake of June 13th2008 occurred in a region of convergencebetween the Pacific Plate and the Okhotsksection of the North American Plate in northernJapan, where the Pacific plate is moving west-northwest with respect to North America at arate of approximately 8.3 cm/yr. The hypocenterof the earthquake indicates shallow thrustingmotion in the upper (Okhotsk) plate, abovethe subducting Pacific plate, which lies atapproximately 80 km depth at this location.The earthquake occurred in a region of upper-plate contraction, probably within the complicat-ed tectonics of the Ou Backbone Range,known to have hosted several large earth-quakes in historic times. The largest of theseevents occurred in 1896, approximately 70kmnorth of the June 13th event, and killed over200 people in the local area.
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.
EXPLANATIONMain Shock M6.8
Mag ≥ 7.00 - 69 km70 - 299300 - 600
Plate BoundariesSubductionTransformDivergent
ConvergentVolcanoes
RELATIVE PLATE MOTIONSPlate boundary symbols indicate thegeneral pattern of relative plate motion.The Pacific Plate, however, is movingwest-northwest relative to the OkhotskPlate at approximately 8.3 cm/yr.
0 400 800 1,200 1,600200Kilometers
Scale
REFERENCESBird, P., 2003, An updated digital model of plate boundaries: Geochem. Geophys. Geosyst., v. 4, no. 3, pp. 1027- 80.Engdahl, E.R. and Villaseñor, 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 Academeic Press, 932 p.Engdahl, E.R., Van der Hilst, R.D., and Buland, R.P., 1998, Global teleseismic earthquake relocation with improved trav- el times and procedures for depth determination: Bull. Seism. Soc. Amer., v. 88, p. 722-743.
Scale 1:4,000,000
Finite Fault Modelfor M6.8 Earthquake
Significant Earthquakes Mag >= 7.5
Year Mon Day Time Lat Long Dep Mag1896 08 31 1706 39.500 140.700 0 7.21901 08 09 1833 40.600 142.300 35 7.51906 01 21 1349 34.000 137.000 350 7.71909 03 13 1429 34.500 141.500 35 7.61915 11 01 0724 38.300 142.900 35 7.51923 09 01 0258 35.405 139.084 35 7.91923 09 02 0246 34.900 140.200 35 7.61931 03 09 0348 40.484 142.664 35 7.71933 03 02 1731 39.224 144.622 35 8.41938 05 23 0718 36.458 141.755 35 7.71938 11 05 0843 37.009 142.045 35 7.91938 11 05 1050 37.108 142.081 35 7.81938 11 06 0853 37.287 142.283 35 7.71944 12 07 0435 33.750 136.000 0 8.11952 03 04 0122 42.500 143.000 0 8.11953 11 25 1748 34.034 141.786 35 7.91960 03 20 1707 39.871 143.435 2.1 7.81964 06 16 0401 38.434 139.226 13.1 7.51968 05 16 0049 40.903 143.346 25.8 8.31968 05 16 1039 41.593 142.786 11.8 7.81978 06 12 0814 38.224 142.009 53.3 7.71983 05 26 0300 40.468 139.080 20 7.71993 01 15 1106 43.022 144.124 102 7.61993 07 12 1317 42.883 139.225 20.4 7.71994 12 28 1219 40.530 143.403 29.2 7.8
Peak Ground Acceleration in m/sec**2
.2 .4 .8 1.6 2.4 3.2 4.0 4.8
S e a o f J a p a n
EPICENTRAL REGION
P a c i f i c O c e a n
EXPLANATIONEarthquake Magnitude
5.50 - 5.996.00 - 6.997.00 - 7.998.00 - 8.99
9.00 - 9.99
Earthquake Depth0 - 6970 - 299300 - 700
FINITE FAULT MODELContributed byGavin Hayes, NEIC and ChenJi, University of California atSanta BarbaraDistribution of the amplitudeand direction of slip forsubfault elements (smallrectangles) of the fault rupturemodel are determined from theinversion of teleseismic bodywaveforms. Arrows indicatethe amplitude and direction ofslip (of the hanging wall withrespect to the foot wall); theslip amount is also color-codedas shown. The view of therupture plane is from above.The strike of the fault ruptureplane is N25E and the dip is49.67 NW. The dimensions ofthe subfault elements are 3 kmin the strike direction and 2 kmin the dip direction. Theseismic moment releasedbased on the plane is 2.466E+26 dyne.cm.
1:20,000,000
1:20,000,000
EPICENTRAL REGION
Did You Feel It?
Distan
ce al
ong s
trike 2
05° (N
155°
W) (k
m)
Distance downdip (km)
Dip 49.67° Northwest 0
-22
0
-19
23
Slip (cm)0 - 5050 - 100100 - 150150 - 200200 - 250250 - 300300 - 350350 - 400400 - 450450 - 500500 - 550
