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M 7.4 Quake Strikes Japan Region

Posted by feww on December 21, 2010

Powerful Quake Strikes Japan’s Bonin Islands

Earthquake Location Map. Cross shows epicenter of the 7.4Mw quake, while the colored bubbles indicate the seismic intensity at various monitoring centers in Japan. Source: Japan’s Meteorological Agency (JMA). Image may be subject to copyright.

Tsunami Warning/Advisory

The 7.4Mw quake struck at a depth of 10km and created a tsunami which reached a height of about  3m (10 feet) in at least a dozen locations around Japan’s coastal areas

JMA said on its Website:

Tsunami Observations
As of 05:40 JST (UTC+ 9 hours)
At some parts of the coasts, tsunamis may be higher than those observed at the observation sites.
The tsunamis can become higher from now on.

However, JMA later downgraded the warning to a tsunami advisory for the area.

Tsunami Map for the 7.4Mw Bonin Islands Earthquake.
Source: Japan’s Meteorological Agency (JMA). Image may be subject to copyright. The tsunami reached a height of about 3m in at least 12 locations around Japan’s coastal areas.

Earthquake Details [JMA]

  • Magnitude: 7.4Mw [Reported as 7.5Mw by GFZ Potsdam – Earthquake Bulletin]
  • Date- Time 02:20 JST on 22 Dec 2010 a
  • Location: 27.5N 143.4E  Depth: 10km
  • Region: Chichijima Kinkai  [Bonin Islands, Japan Region]
  • Distances [USGS]
    • 150 km (95 miles) E of Chichi-shima, Bonin Islands, Japan
    • 335 km (210 miles) NE of Iwo Jima, Volcano Islands, Japan
    • 1050 km (650 miles) SSE of TOKYO, Japan


About 3 dozen strong aftershocks were reported, as of posting, the most significant of which measured 5.0Mw. Many more aftershocks may follow in the coming days and weeks.

FEWW Forecast

More powerful earthquakes, some related to this event, could strike Japan Region, much closer to the coastal areas.

On June 13, 2010, FIRE-EARTH forecast

Fire Earth Model shows that Japan region could be struck by up to 4 additional strong to large earthquakes possibly this year/early next year, one of which could be a catastrophic event.

Japan Earthquake Forecasts (FEWW)

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