不规则测线视电阻率数据的3D反演方法

doi:10.11720/wtyht.2025.1277

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Abstract

The electrical resistivity tomography (ERT) method has become the primary geophysical technique for landslide structure investigation. However, the complex terrain of landslides and the impacts of collapsed surface features render it challenging to arrange survey lines orderly along a straight line in practice. This leads to deviations in the calculations of apparent resistivity. To minimize the impacts of irregular survey lines on the final results, this study developed a scheme for the 3D inversion of measured data. Specifically, this scheme minimized 3D grid subdivision by identifying the rectangle enclosing the minimum area of complete survey lines. Meanwhile, this scheme suppressed the changes in model parameters in the vertical direction by increasing the regularization parameters along the vertical direction of the survey lines. Numerical simulation results indicate that, compared to the traditional 2D inversion scheme, the proposed 3D inversion scheme can significantly improve the identification accuracy of the sliding zone. The measured results of the Baishuihe landslide have verified the effectiveness of the proposed method.

Key words： electrical resistivity tomography complex terrain irregular survey line 3D inversion landslide

Received: 26 June 2024 Published: 07 August 2025

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	Articles by authors
	Jun-Qi GUO
	Ben-Feng FAN
	Kai LU
	Peng WANG
	Hao-Jie ZHAI

Cite this article:

Jun-Qi GUO,Ben-Feng FAN,Kai LU, et al. A 3D inversion method for apparent resistivity data along irregular survey lines under complex terrain[J]. Geophysical and Geochemical Exploration, 2025, 49(4): 896-901.

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https://www.wutanyuhuatan.com/EN/10.11720/wtyht.2025.1277 OR https://www.wutanyuhuatan.com/EN/Y2025/V49/I4/896

Schematic of the 3D inversion process for resistivity data from irregular survey lines
a—the electrode distribution in the projected coordinate system; b—the minimum enclosing rectangular area and the transformed coordinate system; c—the grid division after coordinate transformation; d—the resistivity model obtained from 3D inversion after maximizing the regularization parameter in the y direction; e—the resistivity data extracted at the bottom of the survey line; f—the resistivity cross-section diagram where the coordinates in e are converted into 2D survey line length and elevation

Schematic of numerical model of landslide bodies and irregular survey lines

Numerical simulation results
a—shows the resistivity model at the bottom of the survey line, where the blue area represents 30 Ω·m and the red area represents 100 Ω·m; b—shows the 2D cross-sectional display of the 3D forward modeling apparent resistivity data; c—shows the smooth-constrained 2D inversion cross-section, where the black lines represent the projected positions of the fault zones on the inversion cross-section; d—shows the resistivity cross-section obtained by the 3D inversion method in this study

Surface topography of the Baishui River landslide and positions of actual survey lines

Inversion results of actual measured data from irregular survey lines
a—shows the results for ERT-1 survey line; b—shows the results for ERT-2 survey line

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