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2007 Tocopilla earthquake
The 2007 Tocopilla earthquake occurred on November 14 at . Its epicenter was located between the localities of Quillagua and Tocopilla, affecting the Tarapacá and the Antofagasta regions in northern Chile. The earthquake had a moment magnitude of 7.7 and lasted about 3 minutes and 35 seconds.〔Terra.cl, 14/11/07, ''(«Fuerte sismo sacudió esta tarde al Norte del País» )''〕 Seventeen aftershocks of magnitude greater than 5.3, including one of magnitude 7.1 and two others of magnitude 6.3 or higher, were recorded.〔(Magnitude 7.1, Antofagasta earthquake ) of 15 November 2007〕 The Pacific Tsunami Warning Center issued a tsunami warning, stating a tsunami had been generated; after one hour, this warning was cancelled.〔(NOAA Pacific Tsunami Warning Center )〕〔(Cancellation bulletin ) issued by the PTWC〕
The earthquake was felt from Santiago, 1,245 km south from the epicenter, to La Paz, about 700 km north-northeast.〔(Strong earthquake shakes northern Chile, kills at least two ) AFP news report〕
== Tectonic summary ==
The USGS reported that the earthquake resulted 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 79 mm/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 9.1 earthquake of 1877, which produced a destructive tsunami and whose source region has since the late 1970s been recognized as a potentially dangerous seismic gap. In 1995, a magnitude 8.0 earthquake occurred in the same subduction zone approximately 200 km further south of the November 14th event.〔(Magnitude 7.7 - ANTOFAGASTA, CHILE )〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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