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A powerful earthquake has struck the east coast of Honshu, Japan. The preliminary magnitude was 6.0, according to the U.S. Geological Survey. A tsunami warning has not been issued. Details from the USGS:

Date-Time:

Tuesday, February 14, 2012 at 06:21:58 UTC

Tuesday, February 14, 2012 at 03:21:58 PM at epicenter

Location: 36.154°N, 141.494°E

Depth: 10 km (6.2 miles)

Distances from epicenter:

93 km (57 miles) ESE of Mito, Honshu, Japan

113 km (70 miles) SSE of Iwaki, Honshu, Japan

151 km (93 miles) ESE of Utsunomiya, Honshu, Japan

165 km (102 miles) ENE of TOKYO, Japan

This page will be updated if the event proves significant.