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2010 March 11 14:39:44 UTC

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Earthquake Details

  • This event has been reviewed by a seismologist.
Location34.259°S, 71.929°W
Depth11 km (6.8 miles) set by location program
Distances105 km (65 miles) W of Rancagua, Chile
130 km (80 miles) N of Talca, Chile
140 km (85 miles) S of Valparaiso, Chile
145 km (90 miles) SW of SANTIAGO, Chile
Location Uncertaintyhorizontal +/- 6.3 km (3.9 miles); depth fixed by location program
ParametersNST=284, Nph=284, Dmin=594 km, Rmss=0.89 sec, Gp= 18°,
M-type=teleseismic moment magnitude (Mw), Version=A
Event IDus2010tsa6
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Earthquake Summary

Small globe showing earthquakeSmall map showing earthquake

Felt Reports

Damage reported at Rancagua. A small tsunami was recorded with wave heights (peak-to-peak) of 16 cm at Valparaiso and 29 cm at San Antonio. Felt (VII) at Rancagua; (IV) at Santiago and Talca; (V) at Concepcion, San Antonio and Valparaiso; (IV) at Petorca, Quillota, Temuco and Villa Alemana; (III) at Quintero.

Tectonic Summary

Location map The Chile earthquakes of March 11, 2010, 14:39 UTC and 14:55 UTC, occurred in the region of the plate boundary between the Nazca and South America plates, in the aftershock region of the great Chile earthquake of February 27, 2010. The March 11 earthquakes almost certainly occurred as the result of the change of regional stress caused by the February 27 earthquake. Preliminary analyses of their locations and seismic-wave radiation patterns, however, imply that the March 11 shocks occurred as the result of normal faulting within the subducting Nazca plate or the overriding South America plate, unlike the February 27 earthquake, which occurred as thrust faulting on the interface between the two plates. At present, the focal depths of the shocks are not known with sufficient precision to confidently determine within which of the Nazca or South America plate the earthquakes occurred.

Earthquake Information for Chile

Earthquake Information for South America

Tsunami Information

The earthquake locations and magnitudes cited in NOAA tsunami statements and bulletins are preliminary and are superseded by USGS locations and magnitudes computed using more extensive data sets.

General Tsunami Information