Joint Inversion of 1-D Magnetotelluric and Surface-Wave Dispersion Data with an Improved Multi-Objective Genetic Algorithm and Application to the Data of the Longmenshan Fault Zone
Joint Inversion of 1-D Magnetotelluric and Surface-Wave Dispersion Data with an Improved Multi-Objective Genetic Algorithm and Application to the Data of the Longmenshan Fault Zone
复制标题
改进的多目标遗传算法一维大地电磁波和面波频散数据联合反演及其在龙门山断裂带数据中的应用
DOI：
10.1007/s00024-018-1884-z
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发表时间：
2018-05
影响因子：
2
通讯作者：
Mao Wang
中科院分区：
文献类型：
--
作者：
Pingping Wu;H;ong Tan;Miao Peng;Huan Ma;Mao Wang
大地电磁法和地震面波法是两种重要的深部地球物理勘探方法。联合反演可以提高反演精度。本文提出了一种改进的多目标遗传算法（NSGA-SBX），并将其应用于两个数值试验，以验证该算法的优点。研究结果表明，当电性模型和速度模型的不连续性一致时，采用NSGA-SBX方法进行联合反演可以通过加强结构耦合来改善反演结果;当电性模型和速度模型的不连续性不一致时，联合反演可以保留单独反演的优点。通过将该算法应用于龙门山断裂带沿着的四个检测点，我们观察到几个特征。四川盆地地壳浅部S波速度低、电导率高，可能与沉积层厚有关。青藏高原东缘地壳浅部表现为高速度、高电阻率，而中下地壳存在两个低速层和一个高导层，可能是中地壳通道流的指示。沿着龙门山断裂带，在北方段下方约8 ~ 20 km处存在高导层，在中段下方随深度减小，这可能是断裂带流体含量升高所致。
Magnetotellurics and seismic surface waves are two prominent geophysical methods for deep underground exploration. Joint inversion of these two datasets can help enhance the accuracy of inversion. In this paper, we describe a method for developing an improved multi-objective genetic algorithm (NSGA–SBX) and applying it to two numerical tests to verify the advantages of the algorithm. Our findings show that joint inversion with the NSGA–SBX method can improve the inversion results by strengthening structural coupling when the discontinuities of the electrical and velocity models are consistent, and in case of inconsistent discontinuities between these models, joint inversion can retain the advantages of individual inversions. By applying the algorithm to four detection points along the Longmenshan fault zone, we observe several features. The Sichuan Basin demonstrates low S-wave velocity and high conductivity in the shallow crust probably due to thick sedimentary layers. The eastern margin of the Tibetan Plateau shows high velocity and high resistivity in the shallow crust, while two low velocity layers and a high conductivity layer are observed in the middle lower crust, probably indicating the mid-crustal channel flow. Along the Longmenshan fault zone, a high conductivity layer from ~ 8 to ~ 20 km is observed beneath the northern segment and decreases with depth beneath the middle segment, which might be caused by the elevated fluid content of the fault zone.
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DOI：
10.1029/2009jb006369
发表时间：
2010-04
期刊：
Journal of Geophysical Research: Solid Earth
影响因子：
--
作者：
M. Moorkamp;Alan G. Jones;S. Fishwick
通讯作者：
M. Moorkamp;Alan G. Jones;S. Fishwick
DOI：
10.3997/2214-4609.201410822
发表时间：
1991-05
期刊：
--
影响因子：
--
作者：
L. Dresen;M. Dobróka;Á. Gyulai;T. Ormos;J. Csokas
通讯作者：
L. Dresen;M. Dobróka;Á. Gyulai;T. Ormos;J. Csokas
DOI：
10.1016/0031-9201(94)90034-5
发表时间：
1993-07
期刊：
--
影响因子：
--
作者：
Francis T. Wu
通讯作者：
Francis T. Wu
影响因子：
56.9
作者：
Nelson, KD;Zhao, WJ;Edwards, M
通讯作者：
Edwards, M
影响因子：
6.8
作者：
Srinivas, N.;Deb, Kalyanmoy
通讯作者：
Deb, Kalyanmoy