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Seventh Powerful Quake Hits Japan Region

Posted by feww on October 30, 2009

Powerful Earthquake measuring up to 7.2 Mw Strikes  RYUKYU ISLANDS, JAPAN

Background:

A powerful earthquake measuring up to 7.2 Mw occurred in Ryukyu Islands, Japan, about 280 km (175 miles) SSW of Kagoshima, Kyushu, at a depth of 35 km (21.7 miles), on Friday, October 30, 2009 at 07:03 UTC.

Referring to an earlier forecast, FEWW Moderators believe an additional series of 6 – 7 quakes measuring ≥ 6.0 Mw could strike Japan region in the coming weeks.

FEWW Moderators had previously anticipated more powerful earthquakes in the region, including as many as 10 additional magnitude 6+ quakes to strike the region in the coming weeks.

A moderate earthquake measuring up to 5.3 Mw struck near 29.165°N, 130.061°Eclose to the latest event on Sunday, October 25, 2009 at 06:17 UTC at a depth of about 47.5 km (29.5 miles).

10-degree Map Centered at 30°N,130°E

RYUKYU ISLANDS -  JAPAN - 30-10-2009
Earthquake Location Map. Source: USGS/EHP. Map enhanced by FEWW.

Earthquake Details:

  • Reported Magnitude: 6.9 [Maximum quake magnitude estimated by FEWW at 7.2 Mw]
  • Date-Time:
    • Friday, October 30, 2009 at 07:03:39 UTC
    • Friday, October 30, 2009 at 04:03:39 PM at epicenter
  • Location: 29.154°N, 129.903°E
  • Depth:  35 km (21.7 miles)
  • Region:  RYUKYU ISLANDS, JAPAN
  • Distances:
    • 280 km (175 miles) SSW of Kagoshima, Kyushu, Japan
    • 340 km (210 miles) SSW of Miyazaki, Kyushu, Japan
    • 400 km (245 miles) NNE of Naha, Okinawa, Japan
    • 1170 km (730 miles) SW of TOKYO, Japan
  • Location Uncertainty:  horizontal +/- 5.5 km (3.4 miles)
  • Source: USGS NEIC (WDCS-D)
  • Event ID: us2009njal

Seismic Hazard Map [USGS]

seis nes  30oct09
Major Tectonic Boundaries: Subduction Zones -purple, Ridges -red and Transform Faults -green

Historic Seismicity [Source: USGS?EHP]

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

Related Links:

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