The Sichuan Province in China is located in the middle section of a large north-south seismicity belt. The Xianshuihe Fault striking northwest-southeast, the Longmenshan east fault striking north-south, and the Anninghe Fault striking north-south together form a “Y” shape. Sichuan is located in the east margin of the Qinghai-Tibet crustal block. More than 8,000 earthquakes with magnitude 0.0 occur in Sichuan every year, and 2,000 of these can be located (Han and Lu, 2001).

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Since 26 B.C., 240 strong earthquakes have occurred in Sichuan with magnitude ML ≥ 5.0. Fifty of these events had ML 6.0-6.9,...

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