APPLICATION OF DEFORMATION RATE ACCUMULATION FOR CROSS-FAULT LEVELING IN NORTHEASTERN MARGINS OF QINGHAI-TIBET BLOCK

Six cross-fault leveling data of thirty years in northeastern margins of Qinghai-Tibet block with the method of Deformation Rate Accumulation are analyzed,and the experience and method for extracting anomaly information are discussed,the relevant earthquake cases within 400 km are gathered and analyzed,the experience and characteristics of deformation rate accumulation show: ①Anomaly accumulation chart is more prominent and intuitive than primary curve;②Only out-of-range and continuous anomaly data is cumulated,and discontinuous anomaly data isn't cumulated;③From the time that beginning of anomaly to the earthquakes,this method can be the medium-term indicator of the earthquake prediction.