| Current Tropical Cyclones |
There is 1 active system
Sabtu, 31 Oktober 2009
Magnitude 6.8 - RYUKYU ISLANDS, JAPAN
Magnitude 6.8 - RYUKYU ISLANDS, JAPAN
2009 October 30 07:03:39 UTC
Earthquake Details
| Magnitude | 6.8 |
|---|---|
| Date-Time |
|
| Location | 29.192°N, 129.877°E |
| Depth | 35 km (21.7 miles) set by location program |
| Region | RYUKYU ISLANDS, JAPAN |
| Distances | 275 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 Uncertainty | horizontal +/- 5 km (3.1 miles); depth fixed by location program |
| Parameters | NST=272, Nph=280, Dmin=305.3 km, Rmss=1.02 sec, Gp= 32°, M-type=centroid moment magnitude (Mw), Version=7 |
| Source |
|
| Event ID | us2009njal |
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.
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 Intensity | Est. Population Exposure | Perceived Shaking | Potential Structure Damage | |
|---|---|---|---|---|
| Resistant | Vulnerable | |||
| X | 0 | Extreme | V. Heavy | V. Heavy |
| IX | 0 | Violent | Heavy | V. Heavy |
| VIII | 0 | Severe | Moderate/Heavy | Heavy |
| VII | 100 | Very Strong | Moderate | Moderate/Heavy |
| VI | 4k | Strong | Light | Moderate |
| V | 83k | Moderate | V. Light | Light |
| IV | 212k | Light | none | none |
| II-III | 1,050k* | Weak | none | none |
| I | --* | Not Felt | none | none |
*Estimated exposure only includes population within calculated shake map area
| Population Exposure Population per ~1 sq. km. from LandScan  | Selected Cities Exposed
| ||||||||||||||||||||||||||||||||||||
Shaking Intensity |
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
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