Japan Quake: Strong Shock Rattles Next Target Area

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.

SEE ALSO: JPTRMT1

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

Related Links

• WARNING: JPTRMT1
• Japan Earthquakes, Disasters: Recent History and FIRE-EARTH Forecasts