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3rd Powerful Quake in 3 Days Strikes Japan Region

Posted by feww on August 13, 2009

More Powerful Quakes May Strike Region:FEWW

Magnitude 6.7 Mw the third significant quake to strike Japan region in three days

Another powerful earthquake measuring 6.7Mw occurred about 60km ESE of Hachijo-jima, Izu Islands, Japan Region, USGS reported, striking at a depth of 51 km at 22:48:51 UTC on Wednesday.

A moderate aftershock measuring 4.7 reportedly occurred about three hours later, on Thursday, August 13, 2009 at 01:53:06 UTC [USGS Event ID: us2009kgad.]  See smaller square in red superimposed on the mainshock marked in orange.

10-degree Map Centered at 35°N,140°E

us2009kfcp
Earthquake Location Map. Source: USGS

This Earthquake

  • Magnitude: 6.7
  • Date-Time:
    • Wednesday, August 12, 2009 at 22:48:51 UTC
    • Thursday, August 13, 2009 at 07:48:51 AM at epicenter
  • Location: 32.816°N, 140.382°E
  • Depth: 51 km (31.7 miles) set by location program
  • Region: IZU ISLANDS, JAPAN REGION
  • Distances:
    • 60 km (40 miles) ESE of Hachijo-jima, Izu Islands, Japan
    • 300 km (190 miles) SE of Shizuoka, Honshu, Japan
    • 320 km (200 miles) S of TOKYO, Japan
    • 325 km (200 miles) SE of Hamamatsu, Honshu, Japan
  • Location Uncertainty:  horizontal +/- 5.6 km (3.5 miles); depth fixed by location program
  • Parameters:  NST=156, Nph=156, Dmin=>999 km, Rmss=1 sec, Gp= 58°, M-type=teleseismic moment magnitude (Mw), Version=8
  • Source: USGS NEIC (WDCS-D)
  • Event ID: us2009kfcp

This earthquake was the third significant seismic event to strike Japan region in just over 72 hours.

1. A powerful earthquake measuring 7.1Mw struck about 165km W of Hachijo-jima, Izu Islands, Japan, at a depth of 303.1km at on August 9, 2009 at 10:55:56 UTC. [EQ No 1 on the location map below.]

2. A strong earthquake measuring 6.4 occurred about 30km SSW of Shizuoka, Japan, at a depth of 30km at 20:07:07 UTC on Monday, August 10, 2009. [No 2 on the location map below.]

3. A 3rd earthquake [this report] measuring 6.7 occurred about 60km ESE of Hachijo-jima, Izu Islands, Japan region at a depth of 51 km at 22:48:51 UTC on August 12, 2009. [No 3 on the location map below.]

Location map japan quakes
Location map of the three significant earthquakes that struck Japan between 9 and 12 August 2009. Original Map: USGS

Earthquake Location Maps [USGS]

neic_kfcp_cy  izu  12aug 2009

neic_kfcp -  izu  12aug 2009 zoom in
Major Tectonic Boundaries: Subduction Zones -purple, Ridges -red and Transform Faults -green [Source: USGS]

Seismic Hazard Map
neic_kfcp_w  izu
Major Tectonic Boundaries: Subduction Zones -purple, Ridges -red and Transform Faults -green [Source: USGS]

Historic Seismicity
us2009kcaz izu HisSeis
Major Tectonic Boundaries: Subduction Zones -purple, Ridges -red and Transform Faults -green [Source: USGS]

Tsunami Information

Japan Meteorological Agency reported NO tsunami damage by this earthquake, but said there may be slight sea level changes in the region.

Related Links:

3 Responses to “3rd Powerful Quake in 3 Days Strikes Japan Region”

  1. […] 3rd Powerful Quake in 3 Days Strikes Japan Region […]

  2. feww said

    5th Strong Quake Strikes Japan Region
    https://feww.wordpress.com/2009/08/17/5th-strong-quake-strikes-japan-region/

  3. Sven said

    Interesting is also this video about EQ clouds and how they can be created artificially: http://www.youtube.com/watch?gl=JP&hl=ja&v=DXwr2aTZuy8

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