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2009 Gulf of California earthquake : ウィキペディア英語版 | 2009 Gulf of California earthquake
A 6.9 magnitude earthquake occurred in the Gulf of California, between the Mexican states of Sonora and Baja California, on August 3, 2009, at 10:59:56 a.m. PDT (17:59:56 UTC).〔("Magnitude 6.9 - Gulf of California: 2009 August 03 17:59:56 UTC" ) Earthquake Hazards Program, United States Geological Survey, accessed 3 August 2009〕 The quake's epicenter was located offshore, in the Gulf of California, between two islands, only from Isla Ángel de la Guarda and from Tiburón Island. It was north-northeast of Santa Isabel, Baja California, west of Hermosillo, Sonora. The earthquake occurred along the Tiburón fault zone〔Fenby, S. S. and Gastil, R. G. (1991) "Geologic-tectonic map of the Gulf of California and surrounding areas" ''In'' Dauphin, J. P. and Simoneit, B. R. T. (eds.) ''The Gulf and Peninsular Provinces of the Californias'' AAPG Memoir 47, pp. 79–83〕 that is part of the tectonic boundary between the North American plate and the Pacific plate.〔 The quake rocked buildings in Puerto Libertad, El Desemboque, Punta Chueca, Bahía de Kino, Puerto Peñasco and Hermosillo.〔("Sacuden cuatro sismos las costas de Sonora" ("Four earthquakes shake the coast of Sonora") ) ''La Critica'' (a newspaper in Hermosillo, Sonora) 3 August 2009, in Spanish, accessed 3 August 2009〕 It was felt in Ensenada, Tecate, Mexicali and Tijuana. In the United States, the earthquake was felt in parts of Southern California and Arizona. ==Foreshocks and aftershocks==
* 3 August 2009 - 10:55:23 a.m. PDT (17:55:23 UTC) - 5.8 Mw (4 minutes before the larger quake) 〔("Magnitude 5.8 - Gulf of California: 2009 August 03 17:55:23 UTC" ) Earthquake Hazards Program, United States Geological Survey〕 * 3 August 2009 - 11:33:34 a.m. (18:33:34 UTC) - 5.0 Mw 〔("Magnitude 5.0 - Gulf of California: 2009 August 03 18:33:34 UTC" ) Earthquake Hazards Program, United States Geological Survey〕 * 3 August 2009 - 11:40:55 a.m. (18:40:50 UTC) - 6.2 Mw 〔("Magnitude 6.2 - Gulf of California: 2009 August 03 18:40:55 UTC" ) Earthquake Hazards Program, United States Geological Survey〕 * 5 August 2009 - 02:13:13 a.m. (09:13:13 UTC) - 5.5 Mw 〔("Magnitude 5.5 - Gulf of California: 2009 August 05 09:13:13 UTC" ) Earthquake Hazards Program, United States Geolologic Survey〕
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