August 3, 2016

7.4 Magnitude Earthquake ‘Aftershock’ Hits Japan

A magnitude 7.4 ‘aftershock’ earthquake hits Japan on April 7, 2011 and was detected by the USGS and is being widely reported by Japanese and worldwide news media.


Click here for the USGS earthquake report.

Japan Aftershock - Powerful 7.4 Magnitude Earthquake Hits April 7, 2011

A powerful 7.4 magnitude earthquake aftershock hits Japan on April 7, 2011.

While this is a significantly powerful earthquake in its own right, this is considered to be an aftershock of the powerful Japan earthquake that hit the previous month (See this post about the March 11 Earthquake in Japan).

Bloomberg is reporting that there have been no reports to Japanese nuclear plants, but that a tsunami warning has been issued for Japan.  The Pacific Tsunami Warning Center has issued a bulletin on the aftershock but advises that a tsunami is not expected to reach Hawaii.

The Japan Meteorological Agency issued the following info about the earthquake, measuring it at 7.4 magnitude:

******* Earthquake Information ********
Occurred at 23:32 JST 07 Apr 2011
Region name MIYAGI-KEN OKI
Latitude 38.2N
Longitude 142.0E
Depth about 40 km
Magnitude 7.4

The USGS released the following report on the earthquake, measuring it at a 7.1 magnitude:

Magnitude 7.1
Date-Time 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 49 km (30.4 miles)
Region NEAR THE EAST COAST OF HONSHU, JAPAN
Distances 66 km (41 miles) E ofÊSendai, Honshu, Japan
114 km (70 miles) E ofÊYamagata, Honshu, Japan
116 km (72 miles) ENE ofÊFukushima, Honshu, Japan
330 km (205 miles) NNE ofÊTOKYO, 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 NEIC (WDCS-D)
Event ID usc0002ksa

UPDATE – Tsunami warning for Japan has been lifted.

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