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Posts Tagged ‘japan quake 2009’

Izu-hanto Japan hit by another quake

Posted by feww on December 18, 2009

Shallow earthquake measuring 5.3Mw strikes 75 km (45 miles) E of Shizuoka, Honshu, Japan

The quake was the latest event in a swarm of earthquake that have struck the area since Thursday.

The latest event was located at 35.0N, 139.1E, and occurred at 08:45 JST on 18 Dec 2009, and at a “very shallow” depth, JMA said.

See earlier post for background info: Large Swarm of Quakes Strike Near Honshu, Japan

FEWW Comment: More intense seismic activity may occur in the region. Other geophysical events including seismic, volcanic activity and submarine eruptions may be occurring. The geophysical events in the region could herald a change to the map of Japan.


Above Left: USGS/EHP map of the latest quake measuring 5.3 Mw which struck at a very shallow depth near South Coast of Honshu, Japan.

Above Right: JMA map of the same quake in Izu-hanto Toho-oki. [JMA map may be subject to copyright.]

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Posted in earthquake, Hamamatsu, Izu-hanto Toho-oki, japan quake swarm, Kofu quake, Shizuoka quake | Tagged: , , , , , | 1 Comment »

Large Swarm of Quakes Strike Near Honshu, Japan

Posted by feww on December 17, 2009

Earthquake Measuring M5.3 Strikes Eastern Honshu, Japan

The earthquake was preceded by a large swarm of smaller quakes which began striking SSW of Tokyo, near the south coast of Honshu, early Thursday Japan time.

JMA has recorded about 5 dozen quakes measuring 2.0 to 5.3 Mw in the Izu-Hanto region. It appears that submarine volcanic eruptions may be occurring.

The northern Izu Island arc is a tectonically active region, where several destructive interplate [and intraplate] earthquakes, severe earthquake swarms and volcanic eruptions have previously occurred.

Details of the Latest Quake

10-degree Map Centered at 35°N,140°E


Earthquake Location Map. E
arthquake location marked in blue also show the area where the swarm is striking. Source of the original map: USGS/EHP. Enhancement: FEWW.

  • Magnitude: 5.3
  • Date-Time:  Thursday, December 17, 2009 at 20:41:27 UTC  [Friday, December 18, 2009 at 05:41:27 AM at epicenter]
  • Location: 36.392°N, 139.487°E
  • Depth: 63 km (39.1 miles)
  • Region: EASTERN HONSHU, JAPAN
  • Distances:
    • 40 km (25 miles) E of Maebashi, Honshu, Japan
    • 85 km (50 miles) NNW of TOKYO, Japan
    • 90 km (55 miles) W of Mito, Honshu, Japan
    • 115 km (70 miles) NE of Kofu, Honshu, Japan
  • Location Uncertainty: horizontal +/- 5.3 km (3.3 miles); depth +/- 5.8 km (3.6 miles)
  • Parameters NST=159, Nph=159, Dmin=365.5 km, Rmss=0.73 sec, Gp= 97°, M-type=body wave magnitude (Mb), Version=7
  • Source: USGS NEIC (WDCS-D)
  • Event ID: us2009qhbf

Earthquake Location Maps. Seismicity since December 17, 2009. Source: JMA. Images may be subject to copyright.

FEWW Comment: Regarding the FEWW Forecast of seismicity in Tokyo Bay Area, on November 20, 2009 Fire Earth said: “A tremendous amount of stress energy is unaccounted for in the area near the forecast epicenter.”

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Posted in destructive interplate earthquakes, earthquake, northern Izu Island arc, quake swarm, tokyo earthquake | Tagged: , , , , | 1 Comment »