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Archive for August 5th, 2009

More Aftershocks Strike Gulf of Calif, NZ

Posted by feww on August 5, 2009

Another strong aftershock Strikes Gulf of California

A strong aftershock measuring 5.5Mw struck the Gulf of California on Wednesday, August 5, at 09:13:13 UTC, USGS reported.

The latest aftershock was the third one reported by USGS, which had earlier upgraded a previous aftershock, the largest to date, to a magnitude 6.2 [from 5.9 Mw.]

A powerful mainshock measuring 6.9 shook the Gulf of California on Monday.

10-degree Map Centered at 30°N,115°W

245_30
Earthquake Location Map. USGS

Location: 29.615°N, 113.850°W
Depth: 10km
Event ID: us2009jwbr

A powerful aftershock strikes off west coast of the South Island, NZ

Meanwhile, a much stronger aftershock measuring 6.1Mw struck off west coast of the South Island, New Zealand.

Location: 45.472°S, 166.336°E
Depth: 10km
Event ID: us2009jyaw

Click on the link for details of the mainshock:
Powerful 7.8 M Quake Strikes New Zealand Region

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Posted in Kermadec trench, Mt Ruapehu Eruption Alert, Plate Tectonics, 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

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