Massive earthquake Shakes Japan

Massive deep earthquake sends a vibration all over Japan

Last update: January 1, 2012 at 1:45 pm by By

Earthquake overview : A massive earthquake occurred in the hot solid mantle of the earth.  Due to the focal depth of 370 km this earthquake has been felt all over Japan. The earthquake was however harmless due to the weakened impact.

Intensity map courtesy JMA Japan

Update : The hypocenter of this earthquake was far too deep to generate a tsunami.

Update :  Values of other seismological agencies
EMSC : 7.0 at 365 km
GEOFON : 6.7 at 361 km
CEN : 7.0 at 360 km

The earthquake must have been felt by millions of people.

A little bit to our surprise the shaking was strongest in the greater Tokyo area (see yellow bullets on the JMA map) , although other areas in Japan felt it as a weak shaking and were located closer to the epicenter. Part of the reason will certainly be the propagation of the wave.

The earthquake was calculated to be felt as a weak shaking based on the USGS Data, however the Japanese seismological agency JMA reported a V MMI (moderate shaking). These values are approx.  4 JMA (Japanese use another seismic intensity scale)

Very strong but very deep earthquake with an hypocenter (focal depth) in the hot solid mantle of the earth. Based on calculations of the seismological centers, only a weak shaking will have been felt in a very wide area. The epicenter was located in between a lot of submarine volcanoes .

Most important Earthquake Data:
Magnitude : 7.0 (JMA) 6.8 (USGS)
UTC Time : Sunday, January 01, 2012 at 05:27:54 UTC
Local time at epicenter :  Sunday, January 01, 2012 at 02:27:54 PM at epicenter
Depth (Hypocenter) : 370 km (JMA) 349 km (USGS)
Geo-location(s) :
242 km (150 miles) SW of Hachijo-jima, Izu Islands, Japan
365 km (226 miles) S of Hamamatsu, Honshu, Japan
393 km (244 miles) S of Shizuoka, Honshu, Japan
495 km (307 miles) SSW of TOKYO, Japan

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