Magnitude 6.1 - NEAR THE SOUTH COAST OF HONSHU, JAPAN

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2009 August 10 20:07:07 UTC

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Earthquake Details

  • This event has been reviewed by a seismologist.
Magnitude6.1
Date-Time
Location34.778°N, 138.276°E
Depth26 km (16.2 miles) set by location program
RegionNEAR THE SOUTH COAST OF HONSHU, JAPAN
Distances30 km (20 miles) SSW of Shizuoka, Honshu, Japan
55 km (35 miles) E of Hamamatsu, Honshu, Japan
110 km (70 miles) SSW of Kofu, Honshu, Japan
170 km (105 miles) SW of TOKYO, Japan
Location Uncertaintyhorizontal +/- 5.9 km (3.7 miles); depth fixed by location program
ParametersNST=110, Nph=110, Dmin=708.8 km, Rmss=1.01 sec, Gp= 43°,
M-type=teleseismic moment magnitude (Mw), Version=U
Source
  • USGS NEIC (WDCS-D)
Event IDus2009kdb4
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Earthquake Summary

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Earthquake Summary Poster

Felt Reports

One person killed, 123 people injured and 5,192 buildings damaged in the Shizuoka area. One road damaged at Tokyo. Felt (VI) at Shizuoka; (V) at Akiruno and Numazu; (IV) at Atsugi, Ayase, Gotemba, Machida, Okazaki, Tachikawa, Tokyo, Yamato, Yokohama, Zama and Zushi; (III) at Asaka, Atsugi, Fusa, Hachiaji, Hamura, Kawasaki, Kyoto, Machida, Okazaki, Sagamihara, Yokosuka. A tsunami with a wave height of 60 cm was recorded at Yaizu.

Tectonic Summary

The southern Honshu earthquake of August 10, 2009, occurred near the Suruga Trough, on or very near the boundary between the Philippine Sea plate and the Amur plate (sometimes viewed as part of the Eurasia plate). The source region lies just south of the triple junction of the Philippine Sea plate, the Amur plate, and the Okhotsk plate (sometimes viewed as part of the North America plate) and is tectonically complex. In the epicentral region, the Philippine Sea plate subducts west or northwest beneath the Amur plate. Both the subducting Philippine Sea plate and the overriding Amur plate are seismically active due to high intraplate stresses, and the thrust-fault boundary between the plates is seismogenic. Present estimates of the earthquake’s epicenter, focal-depth, and focal-mechanism suggest that the shock did not occur on the plate interface, but they do not permit us to confidently determine if the earthquake occurred within the Philippine Sea plate or the Amur plate.

Earthquake Information for Asia

Earthquake Information for Japan