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|caption = |map alt = The earthquake's epicenter is shown in northwestern Mexico. |date = April 4, 2010 |origintime = 3:40:41 PDT |duration = 89 seconds |magnitude = 7.2 Mw |depth = |location = |type = |countries affected = Mexico United States |damage = |intensity = IX〔 |tsunami = No |landslide = Yes |aftershocks = Yes |casualties = 4 killed, at least 100 injured in the vicinity of Mexicali.〔 }} The 2010 Baja California earthquake (also known as 2010 Easter earthquake, 2010 Sierra El Mayor earthquake, or 2010 El Mayor – Cucapah earthquake) was an earthquake of 7.2 magnitude on the moment magnitude scale. It started south of Guadalupe Victoria, Baja California, Mexico, at a depth of . It occurred at 3:40:41 pm Pacific Daylight Time (PDT) (22:40:41 UTC) on Easter Sunday, April 4, 2010, and it is said to have lasted about a minute and a half. The strongest shaking was felt in the ejido of Alberto Oviedo Mota, municipality of Mexicali, at Mercalli intensity scale VIII (Severe). In Mexicali, Calexico and Guadalupe Victoria it rated VII (Very Strong), while in Ensenada and Tijuana it measured VI (Strong).〔(PAGER – M 7.2–39.0 mi SSE of Calexico, CA )〕 Most of the damage in this earthquake occurred in the twin cities of Mexicali and Calexico on the Mexico–United States border.〔 Four people were killed and 100 people were injured. The quake was widely felt throughout the Western United States, some Southern zones, and Northwest Mexico. The earthquake was the strongest to rock Southern California in at least 18 years (since the 1992 Landers earthquake (M 7.3)), if not longer: the next most recent comparable earthquake—the 1952 Kern County earthquake (M 7.3)—was 58 years earlier. Each of these earthquakes had a similar magnitude, and was also felt across a large swath of North America. ==Geology== The quake was believed to have occurred on the Laguna Salada Fault, which is about to long and straddles the California–Baja California border.〔 The active Laguna Salada Fault ruptured in February 1892 with an estimated Mw 7.2 earthquake.〔〔(Hough & Elliott, Bulletin of the Seismological Society of America, August 2004, volume 94)〕 By the distribution of aftershocks and using radar interferometry, the main shock rupture was found to have occurred on a previously unmapped fault in the Cucapa Mountains and beneath the Colorado River Delta. This fault line was named the Indiviso Fault, after the nearby town of El Indiviso. A liquefaction zone bounded by the Cerro Prieto Fault and the Laguna Salada Fault was observed.〔http://www.asf.alaska.edu/news_notes/6-4/m72-el-major-cucapa-earthquake-baja-california〕 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「2010 Baja California earthquake」の詳細全文を読む スポンサード リンク
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