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Archive for the ‘Okinawa Islands’ Category

Magnitude 6.2 Quake Strikes Kyushu, Japan

Posted by feww on September 3, 2009

Strong 6.2 Mw quake strikes off the south-western tip of the Island of Kyushu, Japan

The earthquake, reported by various seismic monitoring centers, occurred on Thursday, September 03, 2009 at 13:26 UTC at a depth of about 160 km some 70 km SW of Kagoshima, Kyushu, Japan.

The 6th strong quake to strike Japan Region in the past several weeks, this event was consistent with FEWW earlier forecast. On August 17, FEWW Moderators  forecast a series of  powerful earthquakes in the region and said as many as 10 additional magnitude 6+ quakes could yet strike the region in coming weeks.

Summary of this earthquake:

GFZ Potsdam – Earthquake Bulletin
Region:     Kyushu, Japan
Time:     2009-09-03 13:26:18.4 UTC
Magnitude:     6.2
Epicenter:     130.19°E   31.18°N
Depth:     166 km

© Helmholtz-Zentrum Potsdam Deutsches GeoForschungsZentrum – GFZ


JMA Map shows the intensity of th equake as recorded by various stations throughout the Islands of Kyushu and Honshu, Japan.
Image may be subject to copyright.

Japan Meteorological Agency (JMA) reported NO tsunami caused by  this quake.

There was no report of any casualties at the time of posting.

10-degree Map Centered at 30°N,130°E

Magnitude 6.2 - KYUSHU - JAPAN 3-09-09

Earthquake Location Map. Source: USGS/EHP. Enhanced by FEWW.

Seismic Hazard Map [Source: USGS]

kyushu 3-09-09  neic_lcaq_w -
Major Tectonic Boundaries: Subduction Zones -purple, Ridges -red and Transform Faults -green

Historic Seismicity [Mag 7+ EQs since 1900] – USGS

kyushu 3-09-09 neic_lcaq_7
Major Tectonic Boundaries: Subduction Zones -purple, Ridges -red and Transform Faults -green

Related Links

Posted in Earthquakes, Fukuoka, global earthquakes, Okinawa Islands, seismic activity report, Seismic Hazard | Tagged: , , , , , , | Leave a Comment »

M 6.4 Quake Strikes SW Ryukkyu Isls, Japan

Posted by feww on August 5, 2009

A Magnitude 6.4  Earthquake Struck Southwestern RyuKyu Islands, Japan

A strong earthquake measuring 6.4 Mw struck southwestern RyuKyu Islands, Japan, Wednesday, August 05, 2009, at 00:18 UTC, USGS reported.

So far, there have been no reports of aftershocks, which might follow later. There has continual seismic activity in the area in the past weeks.

Japan Meterological Agency (JMA) posted no No tsunami warning, however, it advised that slight sea level changes may occur.

Earthquake Details

  • Magnitude: 6.4
  • Date-Time:
    • Wednesday, August 05, 2009 at 00:18:00 UTC
    • Wednesday, August 05, 2009 at 09:18:00 AM at epicenter
  • Location: 24.232°N, 125.007°E

10-degree Map Centered at 25°N,125°E

us2009jyab
Earthquake Location Map. USGS

  • Depth: 35 km (21.7 miles) set by location program
  • Region: Southwestern RyuKyu Islands, Japan
  • Distances:
    • 84 km (52 miles) ESE (103°) from Ishigaki-jima, Ryukyu Islands, Japan
    • 322 km (200 miles) E (97°) from Su-ao, Taiwan
    • 343 km (213 miles) SW (232°) from Naha, Okinawa, Japan
    • 1150 km (714 miles) NNE (21°) from MANILA, Philippines
  • Location Uncertainty:  horizontal +/- 5.1 km (3.2 miles); depth fixed by location program
    Parameters NST=159, Nph=159, Dmin=366 km, Rmss=0.9 sec, Gp= 40°,  M-type=teleseismic moment magnitude (Mw), Version=6
  • Source: USGS NEIC (WDCS-D)
  • Event ID: us2009jyab

Historic Seismicity Magnitude 7 and Greater Earthquakes Since 1900
[Source: USGS]

neic_jyab_7 -- us2009jyab

Seismic Hazard Map [Source: USGS]

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

Related Links:


Posted in Okinawa Islands, Plate Tectonics, Seismic Hazard, Su-ao, tsunami warning | Tagged: , , , , , | 1 Comment »