INVESTIGATION ON INTENSITY DISTRIBUTION AND SEISMOGENIC STRUCTURE OF THE 2001 YAJIANG-KANGDING EARTHQUAKE OF M6.0
He Yulin Zhang Qin Huang Wei (Seismological Bureau of Sichuan Province, Chengdu 610041, China)
An earthquake of M 6.0 occurred on February 23, 2001 in the western Sichuan Province, China. The macroseismic epicenter situated in the high mountain-narrow valley region between Yajiang and Kangding counties. According to the investigation on the earthquake region, the areas with intensity Ⅷ, Ⅶ and Ⅵ region are 180 km 2, 1 472 km 2 and 3 998 km 2, respectively. The isoseismals are generally in elliptic shape with long axis trending near NS direction. The earthquake destroyed many buildings and produced some phenomena of ground failure in the area with intensity Ⅷ. This event may be resulted from long activities of the Litang fault and Yunongxi fault, two main faults in the western Sichuan. The movement between the main faults made the crust stress adjust and concentrate, and finally a quite large energy are released by the earthquake on the secondary fault in the block.
【CateGory Index】： P315.5