MT剖面透视新方法与托来6.0级地震
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摘要
在近 10余年观测研究的基础上 ,采用高精度MMS0 2E系统 ,在青藏高原北缘祁连山地震危险区 ,建立了国内外第一个初具规模的MT透视剖面。研究区不仅电磁干扰背景较弱 ,而且地震活动性较强。自 1986年以来 ,我们已经获得了 11次 5～ 7级地震前后的宝贵资料 ,在研究这些资料的基础上 ,提出了一些有意义的认识和结论。对观测资料进行了全定量化的误差分析 ,评估了MT响应参数的复合二元相关度和可信限 ,论述了MT剖面透视资料的可靠性和可信性。对介质导电性和电性横向非均匀性动态变化的原因进行了讨论。研究表明 ,MT剖面透视为大陆块内破坏性地震的中短期预测及震源物理发展过程提供了定量化的多参数指标体系
Based on the ten years'observation with high precise system of MMS 02E, the first MT profile measurement has been practiced in the dangerous area of earthquake in Qilianshan Mountain on the Qinghai Xizang plateau. The environment of the area has less electronic and magnetic perturbation, and has higher seismicity. Since 1966, the data of 11 earthquakes with greater than magnitude 5 7 has been obtained, from that some significant understanding and results have been proposed. The errors of the data have been calculated, the two dimensional co correlation degree of MT response factors and interval of believing degree have been estimated. The reliability and believing degree of the data from the profile measurement have been discussed and the reasons for the change of both property of conducting electricity of medium and horizontal heteropic property of medium. The study results pointed out MT profile measurement was a useful for medium and short\|term earthquake prediction and earthquake source development monitoring. And the method also could provide a quantitative and multi factor judgement standard.
Based on the ten years'observation with high precise system of MMS 02E, the first MT profile measurement has been practiced in the dangerous area of earthquake in Qilianshan Mountain on the Qinghai Xizang plateau. The environment of the area has less electronic and magnetic perturbation, and has higher seismicity. Since 1966, the data of 11 earthquakes with greater than magnitude 5 7 has been obtained, from that some significant understanding and results have been proposed. The errors of the data have been calculated, the two dimensional co correlation degree of MT response factors and interval of believing degree have been estimated. The reliability and believing degree of the data from the profile measurement have been discussed and the reasons for the change of both property of conducting electricity of medium and horizontal heteropic property of medium. The study results pointed out MT profile measurement was a useful for medium and short\|term earthquake prediction and earthquake source development monitoring. And the method also could provide a quantitative and multi factor judgement standard.
引文
钱家栋 ,1 992 ,点电源二维起伏界面三层介质边界单元法 ,西北地震学报 ,1 4 ( 2 ) ,3～ 1 3。
张云琳、安海静、刘晓玲 ,1 994a,祁连山中西段MT剖面透视研究 ,河西祁连山中段地震危险基础研究 ,北京 :地震出版社
张云琳、刘晓玲、安海静等 ,1 994b,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 ,3 7( 2 ) ,2 0 0～ 2 0 9。
张云琳、刘晓玲、安海静等 ,1 994c ,祁连山中段深部电性结构及潜在震源危险区的研究 ,中国地震 ,1 0 ( 1 ) ,62～ 71。
Барсуков,О .М .,1 983 ,Эдектросопротивлениени3 копористыхгорныхпородитрешинообразование,Физиказемли ,( 4) ,91～96.
Садовсu椃 ,M .A .,1 988,占巴扎布、冯德益 (译 ) ,1 990 ,苏联地震预报文集 (一 ) ,北京 :地震出版社 ,2 9～ 77.
Park,S.K .,1 983 ,Distortionofmagnetotelluricsoundingcurvebythree dimensionalstructures,Geophysics,( 5) ,785～ 797
张云琳、安海静、刘晓玲 ,1 994a,祁连山中西段MT剖面透视研究 ,河西祁连山中段地震危险基础研究 ,北京 :地震出版社
张云琳、刘晓玲、安海静等 ,1 994b,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 ,3 7( 2 ) ,2 0 0～ 2 0 9。
张云琳、刘晓玲、安海静等 ,1 994c ,祁连山中段深部电性结构及潜在震源危险区的研究 ,中国地震 ,1 0 ( 1 ) ,62～ 71。
Барсуков,О .М .,1 983 ,Эдектросопротивлениени3 копористыхгорныхпородитрешинообразование,Физиказемли ,( 4) ,91～96.
Садовсu椃 ,M .A .,1 988,占巴扎布、冯德益 (译 ) ,1 990 ,苏联地震预报文集 (一 ) ,北京 :地震出版社 ,2 9～ 77.
Park,S.K .,1 983 ,Distortionofmagnetotelluricsoundingcurvebythree dimensionalstructures,Geophysics,( 5) ,785～ 797
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