智利发生8.8级特大地震
美国地质勘探局：智利发生8.5级特大地震，原文如下：
Magnitude 8.8 – OFFSHORE MAULE, CHILE
2010 February 27 06:34:14 UTC
Earthquake Details
| Magnitude | 8.8 |
|---|---|
| Date-Time |
|
| Location | 35.846°S, 72.719°W |
| Depth | 35 km (21.7 miles) set by location program |
| Region | OFFSHORE MAULE, CHILE |
| Distances | 100 km (60 miles) NNW of Chillan, Chile 105 km (65 miles) WSW of Talca, Chile 115 km (70 miles) NNE of Concepcion, Chile 325 km (200 miles) SW of SANTIAGO, Chile |
| Location Uncertainty | horizontal +/- 7.2 km (4.5 miles); depth fixed by location program |
| Parameters | NST=255, Nph=255, Dmin=988 km, Rmss=1.12 sec, Gp= 36°, M-type=teleseismic moment magnitude (Mw), Version=7 |
| Source |
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| Event ID | us2010tfan |
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Earthquake Summary
Tectonic Summary
This earthquake occurred at the boundary between the Nazca and South American tectonic plates. The two plates are converging at a rate of 80 mm per year. The earthquake occurred as thrust-faulting on the interface between the two plates, with the Nazca plate moving down and landward below the South American plate. Coastal Chile has a history of very large earthquakes. Since 1973, there have been 13 events of magnitude 7.0 or greater. The February 27 shock originated about 230 km north of the source region of the magnitude 9.5 earthquake of May, 1960 – the largest instrumentally recorded earthquake in the world. This great earthquake killed 1655 people in southern Chile and unleashed a tsunami that crossed the Pacific, killing 61 people in Hawaii, Japan, and the Philippines. Approximately 870 km to the north of the February 27 earthquake is the source region of the magnitude 8.5 earthquake of November, 1922. This great quake significantly impacted central Chile, killing several hundred people and causing severe property damage. The 1922 quake generated a 9-meter local tsunami that inundated the Chile coast near the town of Coquimbo; the tsunami also crossed the Pacific, washing away boats in Hilo harbor, Hawaii. The magnitude 8.8 earthquake of February 27, 2010 ruptured the portion of the South American subduction zone separating these two massive historical earthquakes. A large vigorous aftershock sequence can be expected from this earthquake.
原文地址：http://earthquake.usgs.gov/earthquakes/recenteqsww/Quakes/us2010tfan.html
