美国地震局关于此次四川汶川地震的数据与图片

Posted May 13th, 2008 by admin

　　美国地质调查局（USGS，United States Geological Survey ）公布了此次四川汶川地震的大量数据，还有图片。

图１：震中位置

图２：从Google earth上看震中位置

　　该信息由美国地质调查局，美国国家地震信息中心提供。北京时间五月12号14:28分，在成都西北方向90公里，北京西南1545公里的四川省，发生地震。地震数据和位置可能会在有了进一步的数据和研究之后有所调整。

　　至少8500人死亡，中国许多地区有震感，泰国和台湾部分地区也有震感。

　　原文全文如下：

　　The following is a release by the United States Geological Survey, National Earthquake Information Center: An earthquake occurred 90 km (55 miles) WNW of Chengdu, Sichuan, China and 1545 km (960 miles) SW of BEIJING, Beijing, China at 12:28 AM MDT, May 12, 2008 (2:28 PM local time in China). The magnitude and location may be revised when additional data and further analysis results are available.
Felt Reports

　　At least 8,500 people killed. Felt widely in China. Also felt in parts of Thailand and Taiwan.
Tectonic Summary

　　The Sichuan earthquake of May 12, 2008, occurred as the result of motion on a northeast striking reverse fault or thrust fault on the northwestern margin of the Sichuan Basin. The earthquake’s epicenter and focal-mechanism are consistent with it having occurred as the result of movement on the Longmenshan fault or a tectonically related fault. The earthquake reflects tectonic stresses resulting from the convergence of crustal material slowly moving from the high Tibetan Plateau, to the west, against strong crust underlying the Sichuan Basin and southeastern China.

　　On a continental scale, the seismicity of central and eastern Asia is a result of northward convergence of the India plate against the Eurasia plate with a velocity of about 50 mm/y. The convergence of the two plates is broadly accommodated by the uplift of the Asian highlands and by the motion of crustal material to the east away from the uplifted Tibetan Plateau.

　　The northwestern margin of the Sichuan Basin has previously experienced destructive earthquakes. The magnitude 7.5 earthquake of August 25, 1933, killed more than 9,300 people.

　　大家可以运行Google earth，然后下载http://earthquake.usgs.gov/eqcenter/recenteqsww/Quakes/us2008ryan.kml文件打开，即可看到第二张图片的情况。（本文来源：美国地质局）