Magnitude 7.7 - ANTOFAGASTA, CHILE

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Earthquake Details

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Earthquake Summary

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Felt Reports

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.

Tectonic Summary

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 1970’s 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.

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Earthquake Information for South America

Earthquake Information for Chile

Tsunami Information

• NOAA West Coast & Alaska Tsunami Warning Center
• NOAA Pacific Tsunami Warning Center

The earthquake locations and magnitudes cited in these NOAA tsunami bulletins are very preliminary and may be superceded by USGS locations and magnitudes computed using more extensive data sets.

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Scientific & Technical Information

• USGS Prototype Centroid Moment Tensor Solution
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