'Strong' Quake Off Japanese Coast

TECTONICS

Los Angeles (AFP) Nov 14, 2005
A "strong" earthquake measuring 6.9 on the Richter scale rocked the seabed off the east coast of Japan, the US Geological Survey said in a revision of an earlier report.

The epicenter of the quake, which hit at 2138 GMT Monday, was about 350 kilometers (215 miles) east of Sendai on the Japanese island of Honshu, the USGS said.

The temblor originated at a depth of 29.8 kilometers (18.5 miles) from the ocean surface.

The USGS had earlier reported the quake at a magnitude of 7.2 on the open-ended Richter scale and at a depth of 24 kilometers (15 miles).

The Hawaii-based Pacific Tsunami Warning Center reported the power of the quake at a magnitude of 7.3. It gave no immediate tsunami warning.

A 30-centimeter (12-inch) high tsunami reached the shore of the northern Japan city of Ofunato, Iwate prefecture, at 7:26 am (22:26 GMT Monday), a municipal official said. Smaller seismic waves were also observed in the prefecture.

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TECTONICS

First Few Seconds Of Earthquake Rupture Provides Data For Distant Shake Warnings

Berkeley CA (SPX) Nov 10, 2005
A University of California, Berkeley seismologist has discovered a way to provide seconds to tens of seconds of advance warning about impending ground shaking from an earthquake.

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