honshu japan earthquake
TRANSCRIPT
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HONSHU JAPAN
EARTHQUAKE
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EARTHQUAKE DETAILSHONSHU JAPAN EARTHQUAKE
MAGNITUDE 9.0
DATE-TIME Friday, March 11, 2011 at 05:46:24 UTC
Friday March, 20122 at 02:46:24 PM at epicenter
LOCATION 38.297N, 142.372E
DEPTH 30 km (18.6 miles) set by location program
REGION Near the east coast of Honshu, Japan
DISTANCES 129 km (80 miles) E of Sendai, Honshu, Japan
177 km (109 miles) E of Yamagata, Honshu, Japan
177 km (109 miles) ENE of Fukushima, Honshu, Japan
373 km (231 miles) NE of Tokyo, Japan
LOCATION UNCERTAINTY horizontal +/- 13.5 km (8.4 miles); depth fixed by
location program
PARAMETERS NST=350, Nph=351, Dmin=416.3 km, Rmss=0.1 sec,
Gp= 29,
M-type=centroid moment magnitude (Mw), Version=A
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HONSHU JAPAN EARTHQUAKE REPORT
At least 15,703 people killed, 4,647 missing,5,314 injured, 130,927 displaced and at least332,395 buildings, 2,126 roads, 56 bridges and26 railways destroyed or damaged by the
earthquake and tsunami along the entire eastcoast of Honshu from Chiba to Aomori.
The majority of casualties and damageoccurred in Iwate, Miyagi and Fukushima from
a Pacific-wide tsunami with a maximum runupheight of 37.88 m at Miyako.
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HONSHU JAPAN EARTHQUAKE REPORT
The total economic loss in Japan was
estimated at 309 billion US dollars.
Liquefaction observed at Chiba, Odaiba, Tokyo
and Urayasu. The tsunami destroyed or
severely damaged many coastal towns in the
Kuji-Minamisanriku-Nami area.
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TECHTONIC SUMMARY
The magnitude 9.0 Tohoku earthquake on
March 11, 2011, which occurred near thenortheast coast of Honshu, Japan, resultedfrom thrust faultingon or near the subduction
zone plate boundary between the Pacific andNorth America plates.
Modeling of the rupture of this earthquakeindicate that the fault moved upwards of 30-
40 m, and slipped over an area approximately300 km long (along-strike) by 150 km wide (inthe down-dip direction).
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TECHTONIC SUMMARY
The rupture zone is roughly centered on the
earthquake epicenter along-strike, while peakslips were up-dip of the hypocenter, towardsthe Japan Trench axis.
The March 11 earthquake was preceded by aseries of large foreshocks over the previoustwo days, beginning on March 9th with a M7.2 event approximately 40 km from the
epicenter of the March 11 earthquake, andcontinuing with another three earthquakesgreater than M 6 on the same day.
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LOCATION MAP
Major Tectonic Boundaries: Subduction Zones -purple, Ridges -red and Transform Faults
Major Tectonic Boundaries: Subduction Zones -purple,
Ridges -red and Transform Faults -green
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SEISMIC HAZARD MAP
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AFTERSHOCK MAP
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HONSHU JAPAN EARTHQUAKE
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