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Earthquake Hazards Program

Magnitude 7.0 NEAR THE EAST COAST OF HONSHU, JAPAN

2003 May 26 09:24:32 UTC

Preliminary Earthquake Report

U.S. Geological Survey, National Earthquake Information Center
World Data Center for Seismology, Denver

World Location

Regional Location

Magnitude 7.0
Date-Time Monday, May 26, 2003 at 09:24:32 (UTC) - Coordinated Universal Time
Monday, May 26, 2003 at 06:24:32 PM local time at epicenter
Time of Earthquake in other Time Zones
Location 38.90N 141.45E
Depth 68.2 kilometers
Region NEAR THE EAST COAST OF HONSHU, JAPAN
Reference 85 km (55 miles) NE of Sendai, Honshu, Japan
95 km (60 miles) SSE of Morioka, Honshu, Japan
150 km (95 miles) SE of Akita, Honshu, Japan
390 km (240 miles) NNE of TOKYO, Japan
Location Quality Error estimate: horizontal +/- 6.5 km; depth fixed by location program
Location Quality
Parameters
Nst=173, Nph=180, Dmin=386.7 km, Rmss=0.78 sec, Erho=6.5 km, Erzz=0 km, Gp=31.8 degrees
Source USGS NEIC (WDCS-D)
Remarks At least 104 people injured, some damage and landslides occurred in the Sendai area. Felt in much of northern Japan and as far south as Tokyo. Recorded (6L JMA) in Iwate and Miyagi; (5L JMA) in Aomori, Fukushima and Yamagata; (4 JMA) in Akita, Chiba, Ibaraki, Saitama and Tochigi; (3 JMA) in Gumma, Kanagawa, Nagano, Niigata, Shizuoka, Tokyo and Yamanashi Prefectures. Also recorded (4 JMA) in south- central Hokkaido and (3 JMA) throughout southern and central Hokkaido.

This thrust earthquake occurred near the north-east shore of the island of Honshu, Japan. In this region, the convergence of the Pacific plate and the Eurasian plate generates numerous earthquakes. The Pacific plate is moving west at a rate of about 9 cm per year relative to the Eurasian plate. The surface expression of the boundary between these plates is the north-south trending Japan trench which is about 220 km east of the epicenter. Given the earthquake's fault mechanism and depth, it likely resulted from the release of compressional stresses within the Pacific plate that continuously develop as it descends into the mantle.

Scientific & Technical Links

NB: The region name is an automatically generated name from the Flinn-Engdahl (F-E) seismic and geographical regionalization scheme. The boundaries of these regions are defined at one-degree intervals and therefore differ from irregular political boundaries. More->


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