摘要
The earth-resistivity change recorded before the Jingtai earthquake(EQ).with Ms=6.2 at 11 geoelectric stations within 400 km of the EQ was discussed in this paper,and the following conclusions are made:1) imminent variations of earth-resistivity prior to the EQ were recorded at the Wuwei,Dingxi and Shandan stations immediately before the EQ;2) the recordability of the imminent variations at a station was related to the active deep faults and the strongly active faults inside and outside the focal zone,and to the causative stress field as well;3) the temporal and spatial characteristics of the earth-resistivity change immediately before the EQ showed that the EQ was probably induced by the NNW direction stress field(or by another one of similar direction)which was greatly increased during a short period immediately before the EQ and that the northern wall of the focal fault played a major role in the process of the EQ preparation and occurrence of the EQ.
The earth-resistivity change recorded before the Jingtai earthquake(EQ).with Ms=6.2 at 11 geoelectric stations within 400 km of the EQ was discussed in this paper,and the following conclusions are made:1) imminent variations of earth-resistivity prior to the EQ were recorded at the Wuwei,Dingxi and Shandan stations immediately before the EQ;2) the recordability of the imminent variations at a station was related to the active deep faults and the strongly active faults inside and outside the focal zone,and to the causative stress field as well;3) the temporal and spatial characteristics of the earth-resistivity change immediately before the EQ showed that the EQ was probably induced by the NNW direction stress field(or by another one of similar direction)which was greatly increased during a short period immediately before the EQ and that the northern wall of the focal fault played a major role in the process of the EQ preparation and occurrence of the EQ.
