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Japan Quake: Strong Shock Rattles Next Target Area

Posted by feww on April 22, 2011

M6.2 Quake Strikes 16 km East of Chiba

Strong Quakes Rattles Large Areas East of Tokyo, Japan

The strong quake, epicentered  at 140.39°E,  35.53°N struck at a depth of 28km at 13:37:02 UTC on April 21, GFZ Potsdam reported.

The quake was followed by a number of aftershocks, the largest of which measured 5.6Mw.

FIRE-EARTH forecast: The mean distance of epicenters for significant shocks striking near Boso Triple Junction (Sagami Trough), on the east coast of Honshu, are moving closer to Tokyo area, making Chiba City a highly probable target for a large quake (Magnitude > 8.4Mw).

NGDC/NOAA map of Japan Trench, with the broader location of Boso Triple Junction marked. Map enhanced by FIRE-EARTH.


Earthquake Map

Quake Details

Region: Near East Coast of Honshu, Japan
Magnitude: 6.2Mw
Time:     2011-04-21 13:37:01.9 UTC
Epicenter:     140.39°E, 35.53°N
Depth:     28 km
Source: GFZ Potsdam – Earthquake Bulletin

Japan Meteorological Agency reported the quake as a 6.0Mw, while USGS recorded a 6.1Mw shock. NO tsunami warning/advisory was issued.

Distances [USGS]

  • 64 km (39 miles) E of TOKYO, Japan
  • 76 km (47 miles) ENE of Yokohama, Honshu, Japan
  • 82 km (50 miles) S of Mito, Honshu, Japan
  • 115 km (71 miles) SSE of Utsunomiya, Honshu, Japan

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