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Posts Tagged ‘Izu Islands quake’

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:

Posted in 3rd Japan Quake, earthquake forecast, Hachijo-jima, seismic event report, Shizuoka | Tagged: , , , , | 3 Comments »

Powerful Earthquake Strikes Near Izu Islands, Japan

Posted by feww on August 9, 2009

Magnitude 7.1 Quake Occurs Near Izu Islands, Japan Region

A powerful earthquake measuring 7.1Mw occurred about 165km W of Hachijo-jima, Izu Islands, Japan, USGS reported, striking at a depth of 303.1km at 10:55:56 UTC.

Japan’s Meteorological agency said there was NO tsunami threat caused by this earthquake.

According to Reuters News Agency, quoting the national broadcaster, NHK, some high-speed train services were briefly suspended, while the tracks were checked, but no damage was reported.

This event raises the probability of FEWW forecast for Tokyo region to about 0.9 (86%).

Earthquake details:

  • Magnitude: 7.1
  • Date-Time
    • Sunday, August 09, 2009 at 10:55:56 UTC
    • Sunday, August 09, 2009 at 07:55:56 PM at epicenter
  • Location: 33.144°N, 138.040°E
  • Depth: 303.1 km (188.3 miles)
  • Region: IZU ISLANDS, JAPAN REGION
  • Distances
    • 165 km (100 miles) W of Hachijo-jima, Izu Islands, Japan
    • 175 km (110 miles) S of Hamamatsu, Honshu, Japan
    • 205 km (130 miles) S of Shizuoka, Honshu, Japan
    • 320 km (200 miles) SSW of TOKYO, Japan
  • Location Uncertainty: horizontal +/- 5 km (3.1 miles); depth +/- 8.9 km (5.5 miles)
  • Parameters: NST=201, Nph=201, Dmin=668.8 km, Rmss=0.85 sec, Gp= 29°, M-type=teleseismic moment magnitude (Mw), Version=7
  • Source: USGS NEIC (WDCS-D)
  • Event ID: us2009kcaz

10-degree Map Centered at 35°N,140°E

us2009kcaz izu
Earthquake Location Map. Source: USGS

Earthquake Location. [USGS.]

us2009jyab eq-loc
Major Tectonic Boundaries: Subduction Zones -purple, Ridges -red and Transform Faults -green.

For additional location maps click here.

Historic Seismicity [Source: USGS]

us2009kcaz izu HisSeis
Major Tectonic Boundaries: Subduction Zones -purple, Ridges -red and Transform Faults -green

Seismic Hazard Map [Source: USGS]
us2009kcaz-izu SeisHaz

Major Tectonic Boundaries: Subduction Zones -purple, Ridges -red and Transform Faults -green

Related Links:

Posted in Honshu quake, seismic event report, Seismic Hazard, Shizuoka, tokyo quake, tsunami threat | Tagged: , , , , , | 3 Comments »