Magnitude 7.7 - ANTOFAGASTA, CHILE
2007 November 14 15:40:50 UTC
- This event has been reviewed by a seismologist.
|Depth||40 km (24.9 miles) set by location program|
|Distances||35 km (25 miles) ESE of Tocopilla, Chile|
100 km (65 miles) WNW of Calama, Chile
165 km (105 miles) NNE of Antofagasta, Chile
1245 km (770 miles) N of SANTIAGO, Chile
|Location Uncertainty||horizontal +/- 6.1 km (3.8 miles); depth fixed by location program|
|Parameters||NST=323, Nph=323, Dmin=108.4 km, Rmss=1.09 sec, Gp= 40°,|
M-type=centroid moment magnitude (Mw), Version=V
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The following is a release by the United States Geological Survey, National Earthquake Information Center: An earthquake occurred about 40 km (25 mi) east-southeast of Tocopilla at 8:40 AM MST, Nov 14, 2007 (12:40 PM local time in Chile). The magnitude and location may be revised when additional data and further analysis results are available.
Two people killed, at least 45 injured and buildings damaged (VIII) at Tocopilla. Twenty people injured and buildings damaged (VII) at Maria Elena. Several thousand homes destroyed or damaged, displacing about 15,000 people in the Maria Elena-Tocopilla area. Buildings damaged (VII) at Antofagasta and Calama. Power and telephone outages occurred at Antofagasta and Iquique. Felt (VIII) at Quillagua; (VII) at Baquedano and Mejillones; (VI) at Alto Hospicio, Arica, Huara, Iquique and Taltal; (V) at Caldera, Chanaral, Copiapo and Tierra Amarilla; (III) at Alto del Carmen, Coquimbo, Freirina, Huasco, La Higuera, La Serena and Vallenar; (II) at Santiago, Valparaiso and Vina del Mar. Felt from Arica to Santiago. Felt (IV) at Arequipa; felt at Lima and in Moquegua and Tacna, Peru. Felt (III) at La Paz; felt at Cochabamba and in other parts of Bolivia. Felt at San Juan, Argentina. Also felt at Sao Paulo, Brazil. Tsunami wave heights in centimeters (peak-to-trough) were recorded at the following tide stations: 25.5 at Antofagasta, 19.5 at Arica, 9.5 at Caldera and 19.3 at Iquique.
The earthquake near Antofagasta, Chile of November 14th 2007 results from the release of stresses generated by the subduction of the oceanic Nazca plate beneath the South American plate. In this region, known as the Peru-Chile subduction zone, the Nazca Plate thrusts beneath South America at a rate of approximately 79mm/year in an east-north-east direction. This earthquake indicates subduction-related thrusting, likely on the interface between these two plates.
This earthquake occurred near (and within) the southern end of the rupture area of the great magnitude 8.8 earthquake of 1877, which produced a destructive tsunami and whose source region has since the late 1970ís been recognized as a potentially dangerous seismic gap. In 1995, a magnitude 8.0 earthquake thrust-fault occurred in the same subduction zone approximately 200km further south of the November 14th event.
Scientific & Technical 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
- Preliminary Earthquake Report
- U.S. Geological Survey, National Earthquake Information Center:
World Data Center for Seismology, Denver