Breaking News: M7.4 quake shakes East Coast of Japan, tsunami alert raised

Earthquake Details

* This event has been reviewed by a seismologist.

Magnitude       7.4


  • Thursday, April 07, 2011 at 14:32:41 UTC
  • Thursday, April 07, 2011 at 11:32:41 PM at epicenter
  • Time of Earthquake in other Time Zones

Location          38.253°N, 141.640°E

Depth  25.6 km (15.9 miles)



  • 66 km (41 miles) E of Sendai, Honshu, Japan
  • 114 km (70 miles) E of Yamagata, Honshu, Japan
  • 116 km (72 miles) ENE of Fukushima, Honshu, Japan
  • 330 km (205 miles) NNE of TOKYO, Japan

Location Uncertainty horizontal +/- 13.1 km (8.1 miles); depth +/- 7.2 km (4.5 miles)

Parameters NST=426, Nph=427, Dmin=358.4 km, Rmss=0.75 sec, Gp= 32°,

M-type=regional moment magnitude (Mw), Version=B

Source: USGS

Tsunami Alert Raised (Updated)

A tsunami warning has been issued for north-eastern Japan after an earthquake with a magnitude of 7.1 struck off the east coast of Honshu.

However, there has been no detectable effect at the Fukushima Daiichi nuclear plant damaged in last month’s quake and tsunami, nor at two other nuclear plants in the area, officials say.

The Japanese authorities have ordered an evacuation from the warning zone.

Fukushima workers were also evacuated.

The tsunami was predicted to have a wave 2m (6ft) high.

Thursday’s quake was 118km (78 miles) north of Fukushima, 40km offshore. It was initially reported to have a magnitude of 7.4 but has now been revised downwards to 7.1, according to the US Geological Survey.

The quake was strong enough to shake buildings in Tokyo, 265km to the south.

Japan’s meteorological agency issued tsunami warnings and advisories for a stretch of coast 420km long, from Aomori prefecture in the north to Ibaraki prefecture in central Japan, just north of Tokyo.

Hundreds of aftershocks have shaken north-eastern Japan in the wake of the earthquake on 11 March, but few have measured higher than 7.0.

About 28,000 people are dead or missing, and hundreds of thousands were left homeless after the tsunami which ripped through Miyagi prefecture.

Source: BBC


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