Magnitude 8.8 - OFFSHORE MAULE, CHILE
2010 February 27 06:34:14 UTC
|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
- This event has been reviewed by a seismologist.
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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 earthquake worldwide in the last 200 years or more. This giant earthquake spawned a tsunami that engulfed the Pacific Ocean. An estimated 1600 lives were lost to the 1960 earthquake and tsunami in Chile, and the 1960 tsunami took another 200 lives among Japan, Hawaii, 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.
Scientific & Technical Information
The earthquake locations and magnitudes cited in NOAA tsunami bulletins are very preliminary and may be superseded by USGS locations and magnitudes computed using more extensive data sets.
Tsunami Bulletins for this Earthquake
- Surviving a TsunamiLessons from Chile, Hawaii, and Japan
- Sobreviviendo a un tsunami: lecciones de Chile, Hawai y Japon
- Tsunami advisory cancellation for US west coast, British Columbia, and Alaska from ATWC - PDF
- Pacific Ocean Tsunami Warning Cancellation from PTWC
- Tsunami Warning Cancellation for the State of Hawaii from PTWC
General Tsunami Information
- Preliminary Earthquake Report
- U.S. Geological Survey, National Earthquake Information Center:
World Data Center for Seismology, Denver