地震前后祁连山中段深部电性变化的跟踪研究
|
摘要
利用在青藏高原北缘（祁连山中段）第一个长约４００ｋｍ的ＭＴ重复监测剖面上所获得的地震前后最新的地表视电阻率资料，用一维ＭＴ反演方法得到了剖面下方电性结构随时间的变化结果。着重分析了相当于大陆多震层深度范围内介质电阻享参数在地震前后的变化。结果表明，地下电阻串的变化呈现分区特征，并与剖面附近地震的强度及位置有关
By using the newest apparent resistivity data which are from the first MT repeated monitoring profile about 400 km long at the middle segment of Mt.Qilian,northern mar- gin of Qinghai-Tibet Plateau before and after earthquakes,the result of electricity varia- tion with time under the profile is obtained through 1-DMT inverse method in this pa- per. The variance of electrical resistivity before and after earthquakes at the depth of most continental earthquakes is principally studied. The results show that the variance of electrical resistivity has the regional characteristics,and relates to magnitued and po- sition of earthquakes near the profile.
By using the newest apparent resistivity data which are from the first MT repeated monitoring profile about 400 km long at the middle segment of Mt.Qilian,northern mar- gin of Qinghai-Tibet Plateau before and after earthquakes,the result of electricity varia- tion with time under the profile is obtained through 1-DMT inverse method in this pa- per. The variance of electrical resistivity before and after earthquakes at the depth of most continental earthquakes is principally studied. The results show that the variance of electrical resistivity has the regional characteristics,and relates to magnitued and po- sition of earthquakes near the profile.
引文
［1］钱家栋、陈有发等编译，1989．地震地电学译文集，北京：地震出版社．［2］张云琳、司玉兰、郭守年、安海静，1989．震源深度范围内视电阻率随时间变化的观测试验及其与地震活动的关系，地震学报，11，98－105．［3］张云琳、刘晓玲、安海静、司玉兰、蒋梅、张五四，1994．MT重复测量在地震中短期预报中的应用─—祁连山中段MT剖面监测研究，地球物理学报，37，200－210．［4］张云琳、刘晓玲、安海静、司玉兰、蒋梅、张五四，1994．祁连山中段深部电住结构及潜在震源区的研究，中国地震，10，62－71．［5］刘国栋、陈乐寿，1984．大地电磁测深研究，北京：地震出版社
版权所有：© 2023 中国地质图书馆 中国地质调查局地学文献中心