地震走时和航空电磁联合反演三维速度和电阻率  

Joint Seismic Travel Time and Airborne Electromagnetic Inversion for 3D Velocity and Electrical Resistivity

作　　者：王月 张捷[2] WANG Yue;ZHANG Jie(China Earthquake Networks Center, Beijing 100045, China;University of Science and Technology of China, Hefei 230026, Anhui, China)

机构地区：[1]中国地震台网中心,北京100045 [2]中国科学技术大学,安徽合肥230026

出　　处：《地震研究》2018年第1期22-31,共10页Journal of Seismological Research

基　　金：国家自然科学基金(41374132)资助

摘　　要：地震走时数据可以反演近地表的速度,但不能反演出隐蔽层和低速层。航空电磁数据可以反演近地表的高电阻率和低电阻率,但是对垂直方向的分辨率低。联合三维地震走时数据和航空电磁数据反演了近地表的速度和电阻率结构,并采用棋盘模型测试和实际数据应用展示了联合反演出的速度模型优于单独的走时反演出的速度模型。结果表明:该算法可以应用到处理数据量大的勘探地震成像中,能提供优化的速度结构。In this paper,seismic travel time data are employed to invert the distribution of the subsurface velocity.However,the data received on the surface are difficult to image low velocity structures or hidden layers. Airborne electromagnetic data are used to image the distribution of subsurface resistivity,and both the high resistivity and low resistivity structures can be inverted,however,the vertical resolution is low. We propose a method to combine the seismic travel times with the airborne electromagnetic data simultaneously to invert the resistivity and velocity. Checkerboard tests and real data application illustrate that the velocity model obtained from joint inversion method is better than that obtained from only travel time tomography. This method can be applied to exploration geophysical imaging and produces optimized velocity structures.

关 键 词：联合反演 航空电磁 地震走时 近地表 

分 类 号：P313.23[天文地球—固体地球物理学]