DEVELOPMENT AND DISTRIBUTION PATTERNS OF ACTIVE FAULT ZONES IN QINGHAI PROVINCE

Active fault zones in Qinghai Province have their own distribution and kinematic characteristics under the pushing function of the Indian plate. This paper is based on the twenty-four active faults in the Province. Most of them are extended to NWW and sinistral strike-slip fault zones. The active fault zones which are extended to the NNW fault zones are dextral strike-slip and have the anti-clockwise direction characteristic. Mang'ai to Yousha mountain active fault have the highest vertical velocity. It may be caused by the crushing stress of the sinistral strike-lip of the Altun active fault zone and the pushing function of the Indian plate. Tecto-genesis of Miocene is the cause of the basic tectonic landform in Qinghai province. The up-lift of north Qinghai-Tibet Plateau is mainly located in west Qaidam and Qilian mountain area. The distribution of the extrusion stress register as the north and south part is more intense than the middle part. The east part is more intense than the west part.