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Posts Tagged ‘Ishigaki-jima’

8th Strong Quake Strikes Ryukyu Islands, Japan

Posted by feww on February 7, 2010

Eighth Strong Earthquake Measuring 6.6Mw Strikes Japan Region

Background:

Referring to an earlier forecast, FEWW Moderators believe an additional series of 5 – 6 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.

Earthquake Information Issued by JMA at 15:15 JST 07 Feb 2010

Occurred at (JST)

Latitude

Longitude

Depth

Mag.

Region Name

15:10 JST 07 Feb 2010

23.4ºN

124.0ºE

10km

6.6Mw

Ishigakijima Kinkai

Approximate distances (USGS)

  • 115 km (70 miles) SSW of Ishigaki-jima, Ryukyu Islands, Japan
  • 225 km (140 miles) ESE of Hua-lien, Taiwan
  • 225 km (140 miles) ESE of Su-ao, Taiwan
  • 2055 km (1280 miles) SW of TOKYO, Japan

Note: USGS/EHP has again downgraded the quake by 0.2 order of magnitude to 6.4Mw

Tsunami Forecast/Watch

JMA Issued a Tsunami Forecast at 15:13 JST 07 Feb 2010 for MIYAKOJIMA and YAEYAMA areas saying that tsunami height was expected to be about 0.5 meters.
However, the tsunami watch was later canceled. JMA said: “No tsunami damage at some of the other coasts though there may be slight sea level changes.:

Fire-Earth anticipates intense seismic activity and volcanic unrest/activity in the Japan Region throughout 2010 and beyond.

10-degree Map Centered at 25°N,125°E


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


Political Map of Japan.

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Posted in Japan quake, Japan Quake Forecast, Japan region quake, seismic event report, volcanism | Tagged: , , , , , , , , | 3 Comments »

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 »