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TOPIC: Chile earthquake


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RE: Chile earthquake
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A strong magnitude 6.5 earthquake occurred at 16:35:59 (UTC) on Monday, June 20, 2011, in the Antofagasta region, Chile, 87 km NE of Calama, at a depth of 117 km.

Locationá 21.898░S, 68.299░W



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A strong magnitude 6.4 earthquake occurred at 12:55:21 (UTC) on Wednesday, June 01, 2011, offshore of the Bio-Bio region, Chile, 7 km North of Lebu, at a depth of 15.1 km.

Locationá 37.545░S, 73.663░W



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Andes earthquake
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Title: Orogenic-wedge deformation and potential for great earthquakes in the central Andean backarc
Authors:áBenjamin A. Brooks, Michael Bevis, Kelin Whipple, J Ramon Arrowsmith, James Foster, Tomas Zapata, Eric Kendrick, Estella Minaya, Arturo Echalar, Mauro Blanco, Pablo Euillades, Mario Sandoval & Robert J. Smalley Jr

Subduction of the Nazca plate beneath South America has driven the growth of the Andes Mountains. Subduction has routinely generated earthquakes larger than magnitude 8.0 along the western margin of the mountain belt, but the potential size of less frequent earthquakes in the eastern, backarc margin is unknown. Continued support of the high Andean Plateau at the centre of the Andes can be explained only if deformation of the backarc margin is ongoing. Here we present GPS data that record surface motions in the Subandean ranges that are part of the backarc margin. We find that the velocity of surface movement decreases sharply from west to east across the Subandean ranges. We suggest that a subhorizontal fault underlying the ranges slips freely at depth in the west, but is locked for up to 100 km in shallower sections further east. Analysis of fault scarps formed where the subhorizontal fault intersects the surface indicates that the fault has generated repeated large earthquakes. We suggest that rupture of the entire locked section of the fault could generate an earthquake of magnitude 8.7 - 8.9. We attribute the large seismic potential to the unusual width of the Subandean ranges, and suggest that deformation of the Subandean ranges, at a rate unmatched by erosion, causes the mountain range to widen.

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RE: Chile earthquake
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A strong magnitude 6.2 earthquake occurred at 12:31:56 (UTC) on Sunday, March 06, 2011, in the Tarapace region, Chile, 93 km East from Tacna, Peru, at a depth of 87.8 km.

Locationá 18.108░S, 69.376░W

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A strong magnitude 6.0 earthquake occurred at 01:29:26 (UTC) on Monday, February 28, 2011, in the Bio-Bio region, Chile, 37 km South of Concepcion, at a depth of 16.7 km.

Locationá 36.623░S, 73.165░W

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A strong magnitude 6.0 earthquake occurred at 10:35:06 (UTC) onSunday, February 13, 2011, offshore of the Bio-Bio region, Chile, 25 km NNW of Concepcion, at a depth of 13.3 km.

Locationá 36.623░S, 73.165░W

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A strong magnitude 6.1 earthquake occurred at 01:17:03 (UTC) on Saturday, February 12, 2011, in the Bio-Bio region, Chile, 15 km South of Concepcion, at a depth of 14.8 km.

Locationá 36.985░S, 73.077░W

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A strong magnitude 6.8 earthquake occurred at 20:05:30 (UTC) on Friday, February 11, 2011, offshore of the Bio-Bio region, Chile, 55 km North of Concepcion, at a depth of 18 km.

Locationá 36.344░S, 72.959░W

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A 7.2-magnitude earthquake has hit off the central coast of Chile, the US Geological Survey says.
The epicentre was 95km northwest of Temuco with a depth of 12km, the USGS said.
It added that there was no current widespread tsunami threat, although there are reports of people fleeing the area.

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A major magnitude 7.1 earthquake occurred at 20:20:16 (UTC) on Sunday, January 02, 2011, in the Araucania region, Chile, 70 km NW of Temuco, at a depth of 16.9 km.

Locationá 38.360░S, 73.281░W

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