honshu japan earthquake

8/11/2019 Honshu Japan Earthquake

1/11

HONSHU JAPAN

EARTHQUAKE


2/11

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


3/11

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.


4/11

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.


5/11

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).


6/11

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.


7/11

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


8/11


9/11

SEISMIC HAZARD MAP


10/11

AFTERSHOCK MAP


11/11

HONSHU JAPAN EARTHQUAKE

END

honshu japan earthquake

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