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.
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:
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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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