[轉貼] 墨西哥La Mira 7.0強震（星盤）

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墨西哥7.0強震 國際機場正常運作

時間：2012/4/12 07:47 撰稿‧編輯：吳寧康 　　新聞引據： 採訪、法新社、美聯社

根據美國地質調查所(USGS)指出，墨西哥西部11日發生芮氏規模7.0強震，首都墨西哥市的建築發生搖晃，人們衝出辦公室跑到街道上避難。目前並未傳出重大損害報告。

　　這起地震發生在台灣時間12日上午6點55分，震央距離米卻肯(Michoacan)州的米拉(La Mira)約51公里處，深度為65.6公里。

　　墨西哥市市長厄伯拉特(Marcelo Ebrard)透過推特指出，目前尚未有嚴重損害的初步跡象傳出，墨西哥市包括地下鐵和國際機場在內的重要服務都正常運作。

　　墨西哥西南部上個月20日曾遭到7.4強震襲擊，墨西哥市居民也感受到搖晃，所幸並未有重大災情。

 

http://news.rti.org.tw/index_newsContent.aspx?nid=349952&id=5&id2=2

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M6.5 - Arteaga, Mexico 2012-04-11 22:55:10 UTC

 

Summary

Location and Magnitude contributed by: USGS National Earthquake Information Center

 

Event Time

1. 2012-04-11 22:55:10 UTC
2. 2012-04-11 15:55:10 UTC-07:00 at epicenter
3. 2012-04-12 06:55:10 UTC+08:00 system time

Nearby Cities

1. 39km (24mi) WSW from Arteaga, Mexico
2. 61km (37mi) WNW from Las Guacamayas, Mexico
3. 61km (37mi) WNW from La Orilla, Mexico
4. 65km (40mi) SW from La Mira Tumbiscatio, Mexico
5. 400km (248mi) WSW from Mexico City, Mexico

Related Links

• Additional earthquake information for Mexico

Tectonic Summary

Seismotectonics of Mexico

Located atop three of the large tectonic plates, Mexico is one of the world's most seismologically active regions. The relative motion of these crustal plates causes frequent earthquakes and occasional volcanic eruptions. Most of the Mexican landmass is on the westward moving North American plate. The Pacific Ocean floor south of Mexico is being carried northeastward by the underlying Cocos plate. Because oceanic crust is relatively dense, when the Pacific Ocean floor encounters the lighter continental crust of the Mexican landmass, the ocean floor is subducted beneath the North American plate creating the deep Middle American trench along Mexico's southern coast. Also as a result of this convergence, the westward moving Mexico landmass is slowed and crumpled creating the mountain ranges of southern Mexico and earthquakes near Mexico's southern coast. As the oceanic crust is pulled downward, it melts; the molten material is then forced upward through weaknesses in the overlying continental crust. This process has created a region of volcanoes across south-central Mexico known as the Cordillera Neovolcánica.

The area west of the Gulf of California, including Mexico's Baja California Peninsula, is moving northwestward with the Pacific plate at about 95 mm per year. Here, the Pacific and North American plates grind past each other creating strike-slip faulting, the southern extension of California's San Andreas fault. In the past, this relative plate motion pulled Baja California away from the coast forming the Gulf of California and is the cause of earthquakes in the Gulf of California region today.

Mexico has a long history of destructive earthquakes and volcanic eruptions. In September 1985, a magnitude 8.1 earthquake killed more than 9,500 people in Mexico City. In southern Mexico, Volcán de Colima and El Chichón erupted in 2005 and 1982, respectively. Paricutín volcano, west of Mexico City, began venting smoke in a cornfield in 1943; a decade later this new volcano had grown to a height of 424 meters. Popocatépetl and Ixtaccíhuatl volcanos ("smoking mountain" and "white lady", respectively), southeast of Mexico City, occasionally vent gas that can be clearly seen from the City, a reminder that volcanic activity is ongoing. In 1994 and 2000 Popocatépetl renewed its activity forcing the evacuation of nearby towns, causing seismologists and government officials to be concerned about the effect a large-scale eruption might have on the heavily populated region. Popocatépetl volcano last erupted in 2010.

More information on regional seismicity and tectonics

 

http://earthquake.usgs.gov/earthquakes/eventpage/usc00090z0#summary

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2012-4-12 17:01