乌鲁木齐地电的短临异常与地震活动

通过对乌鲁木齐地电台1988—1992年视电阻率及自然电位观测资料的分析,认为:该台视电阻率观测曲线具有较好的年变形态,在周围250km范围内发生的3次M_s5.0以上地震前均具有较好的异常显示;N30°E道自然电位对周围100km范围内发生的M_s4.5左右地震反映也较灵敏。在此基础上分析了该台的台址条件,并利用形变观测资料推算该台的k值(k=(Δps/ps)/(ΔL/L)达到10~3量级,确认乌鲁木齐地电台观测条件良好,地震—地电异常是可信的。

SHORT-TERM AND IMPENDING ANOMALIES ON GEOELECTRICITY AND ITS CORRELATION TO SEISMICITIES IN URUMQI AREAS

Through analysis of the observed data of apparent resistivity and spontaneous potential in Urumqi Geoelectricity observation during 1988-1992, we've found that the apparent resistivity curves of this station showed some anomalous shaps in annual variations. Obvious abnormal changes were captured before three earthquakes with magnitude of 5.0 within the distance about 250 km around the station, while the spontaneous potential in the channel N30?E was sensitive to earthquake with Ms 4.5 within the range of about 100 km. Besides, the station condtions were studied as well, and it is estimated that value k( k=l )was in the order of magnitude 10, by which we consider that the conditions of Urumqi Geoeletricity observatory are quite good, and the anomalous patterns of geoelectricily are supposed to be reliable in earthquake prediction.