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 Home > News Releases > A strong aftershock of "The 2011 off the Pacific coast of Tohoku Earthquake" occurred Monday 11 April

A strong aftershock of "The 2011 off the Pacific coast of Tohoku Earthquake" occurred Monday 11 April



    A strong earthquake of magnitude of 7.0 occurred Monday 11 April.
This earthquake is regarded as an aftershock of "The 2011 off the Pacific coast of Tohoku Earthquake".

Earthquake Summary

Date and Time:11 April 2011 17:16 JST (08:16 UTC)
Magnitude:7.0 (interim value)
Hypocenter:N36.9, E140.7 (Iwaki-City) Depth 6km (interim value)
Mechanism:Normal fault type with ENE-WSW tension axis (by first motion mechanism analysis)
Earthquake Early Warning:Issued 6.3 seconds after the detection of the first P-wave at the nearest seismic station
JMA Seismic Intensity:
6- (Max) Nakajima Town, Furudono Town, Iwaki City in Fukushima Prefecture, Hokota City in Ibaraki Prefecture
5+ or weaker Observed nationwide from Hokkaido to Kinki
Tsunami Warnings and Advisories:
Date and Time Action Number of Areas (Total : 66 areas)
Warning
(3m or higher)		 Warning
(Up to 2m)		 Advisory
(About 0.5m)
11 April 2011 17:18 JST (08:18 UTC) Issued 0 1 3
11 April 2011 18:05 JST (09:55 UTC) Lifted 0 0 0
Observed Tsunami: None



Activities of Aftershock

  • This earthquake is regarded as an aftershock of "The 2011 off the Pacific coast of Tohoku Earthquake".
    •
  • As of 18:00JST 11 April, the aftershocks with the seismic intensity of 5 lower occurred 2 times(17:17JST, M6.0 and 17:26JST, M5.6)
    •

Notes on Disaster Prevention

  • In the area where strong shaking was observed, keep vigilant to tremors by aftershocks which may cause landslides and house collapses.
    •

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