MT剖面透视新方法与托来6.0级地震  

Tuolai M_S 6.0 Earthquake and MT Profile Measurement

作　　者：张云琳[1] 刘伟[1] 安海静 陈运平[1] 李志雄[1] 刘晓玲[1] 

机构地区：[1]海南省地震局,中国海口570203 [2]兰州地震研究所,中国兰州730000

出　　处：《中国地震》2001年第1期82-91,共10页Earthquake Research in China

基　　金：地震基金重点课题!"95 0 7 4 3 1"资助

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 。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.

关 键 词：MT剖面透视 视电阻率 扭曲度 主轴方位角 托来地震 地震活动性 

分 类 号：P315.3[天文地球—地震学]