可控源音频大地电磁和微动资料的拟二维联合反演

doi:10.11720/wtyht.2024.1477

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Abstract

Both the controlled source audio-frequency magnetotellurics (CSAMT) and the microtremor survey exhibit promising application prospectsunder strong urban interference. However,single geophysical inversion methods are challenged by a multiplicity of solutions. To achieve the complementary advantages of different geophysical methods, and address the lateral discontinuity of single-point inversion, this studyexplored the quasi-two-dimensional joint inversion of the CSAMTand microtremor survey data. It enabled the joint inversionby introducing a lateral constraint matrix into the objective function for joint inversion and employing the limited-memory Broyden-Fletcher-Goldfarb-Shanno (LBFGS) algorithm. The reliability and effectiveness of the joint inversion were verified using the inversion example of synthetic data from theoretical models. The results show that compared to single data inversion, the joint inversion can effectively improve the accuracy of inversion results, with the resistivity model more consistent with theshear-wave velocity structure. Moreover,lateral constraints can effectively reduce the discontinuity of the physical parameters of adjacentsurvey points. The quasi-two-dimensional joint inversion with lateral constraints enhances the inversion reliability by obtaining more reasonable profile results of physical parameters and structures with the efficiency of single-point inversion.

Key words： joint inversion controlled source audio-frequency magnetotellurics microtremor survey laterally constrained inversion

Received: 10 November 2023 Published: 19 September 2024

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	Ji-Wei ZHANG
	Hui TAN

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Ji-Wei ZHANG,Hui TAN. Quasi-two-dimensional joint inversion of the data from the controlled source audio-frequency magnetotellurics and the microtremor survey[J]. Geophysical and Geochemical Exploration, 2024, 48(4): 1094-1102.

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https://www.wutanyuhuatan.com/EN/10.11720/wtyht.2024.1477 OR https://www.wutanyuhuatan.com/EN/Y2024/V48/I4/1094

Layered model of elastic media

Schematic of quasi two-dimensional joint inversion model

Inversion results of the tilted three layer model
a—tilt three layer resistivity model; b—tilt three layer velocity model; c—single method inversion results (resistivity); d—single method inversion results (shear wave velocity); e—unconstrained joint inversion results (resistivity); f—unconstrained joint inversion results (shear wave velocity); g—lateral constraint joint inversion results (resistivity); h—lateral constraint joint inversion results (shear wave velocity)

Inversion results of step three layer model
a—step three layer resistivity model; b—step three layer velocity model; c—single method inversion results (resistivity); d—single method inversion results (shear wave velocity); e—unconstrained joint inversion results (resistivity); f—unconstrained joint inversion results (shear wave velocity); g—lateral constraint joint inversion results (resistivity); h—lateral constraint joint inversion results (shear wave velocity)

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