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Magnitude 6.8 - RYUKYU ISLANDS, JAPAN

Magnitude 6.8 - RYUKYU ISLANDS, JAPAN

2009 October 30 07:03:39 UTC

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Earthquake Details

Magnitude6.8
Date-Time
Location29.192°N, 129.877°E
Depth35 km (21.7 miles) set by location program
RegionRYUKYU ISLANDS, JAPAN
Distances275 km (170 miles) SSW of Kagoshima, Kyushu, Japan
340 km (210 miles) SSW of Miyazaki, Kyushu, Japan
400 km (250 miles) NNE of Naha, Okinawa, Japan
1170 km (730 miles) SW of TOKYO, Japan
Location Uncertaintyhorizontal +/- 5 km (3.1 miles); depth fixed by location program
ParametersNST=272, Nph=280, Dmin=305.3 km, Rmss=1.02 sec, Gp= 32°,
M-type=centroid moment magnitude (Mw), Version=7
Source
  • USGS NEIC (WDCS-D)
Event IDus2009njal
http://earthquake.usgs.gov/eqcenter/eqinthenews/2009/us2009njal/#scitech

M 6.8 - RYUKYU ISLANDS, JAPAN

PAGER - M 6.8 - RYUKYU ISLANDS, JAPAN

Alert Version: 2Friday, October 30th, 2009 at 07:03:39 UTCLocation: 29.2° N, 129.9° EDepth: 35kmEvent Id: US2009NJALCreated: 8 hours, 10 minutes after earthquake.
Overall, the population in this region resides in structures that are a mix of vulnerable and earthquake resistant construction. A magnitude 7.1 earthquake 126 km South of this one struck Japan on October 18, 1995 (UTC), with estimated population exposures of 8,000 at intensity VIII and 27,000 at intensity VII, with no reported fatalities. On March 18, 1987 (UTC), a magnitude 6.6 earthquake 369 km Northeast of this one struck Japan, with estimated population exposures of 592,000 at intensity VII and 651,000 at intensity VI, resulting in an estimated 1 fatality. Recent earthquakes in this area have caused landslides that may have contributed to losses.

Estimated Population Exposed to Earthquake Shaking

Est. Modified Mercalli IntensityEst. Population ExposurePerceived ShakingPotential Structure Damage
ResistantVulnerable
X0ExtremeV. HeavyV. Heavy
IX0ViolentHeavyV. Heavy
VIII0SevereModerate/HeavyHeavy
VII100Very StrongModerateModerate/Heavy
VI4kStrongLightModerate
V83kModerateV. LightLight
IV212kLightnonenone
II-III1,050k*Weaknonenone
I--*Not Feltnonenone
*Estimated exposure only includes population within calculated shake map area
Population Exposure
Population per ~1 sq. km. from LandScan
Population Exposure Map
Selected Cities Exposed
MMICityPop.
IVNaze41k
IIINishinoomote18k
IIIMakurazaki25k
IIIKaseda24k
IIIIbusuki30k
IIIKagoshima555k
IIIKanoya82k
IIIMiyakonojo131k
IIIKokubu58k
IIIHamanoichi39k
IIINichinan44k
Shaking Intensity
Shake Map

PAGER results are generally available on the Internet within 30 minutes of the earthquake’s occurrence. However, information on the extent of shaking will be uncertain in the minutes and hours following and earthquake and typically improves as additional sensor data and reported intensities are acquired and incorporated into models of the earthquake's source. Users of PAGER estimates should account for uncertainty and always seek the most current PAGER release for any earthquake.

http://earthquake.usgs.gov/earthquakes/pager/events/us/2009njal/index.html