重力异常曲化平的改进插值—迭代法

doi:10.11720/wtyht.2022.1403

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Abstract

Gravity anomaly continuation from undulating surface to plane can provide gravity data on a flat horizontal plane for frequency-domain data processing and inversion. Based on the theory of conventional interpolation-iteration methods, this study proposed a modified interpolation-iteration method by introducing a correction factor of the undulating observation surface in the iteration and correction process. The improved method accelerated the iterative convergence speed and promoted the continuation effects. The theoretical model-based tests show that this method can be used to achieve stable and effective large-span gravity anomaly continuation from greatly undulating surface to plane. The continuation results presented by this method are better than those obtained using conventional interpolation-iteration methods. The application of Bouguer gravity anomaly data of the Sichuan-Yunnan region demonstrates that the modified interpolation-iteration method effectively enhanced anomalous signals and details and can provide reliable data for subsequent processing and interpretation.

Key words： continuation from undulating surface to plane gravity anomaly interpolation-iteration method Sichuan-Yunnan region

Received: 22 July 2021 Published: 25 February 2022

ZTFLH:

P631

Corresponding Authors: GUO Liang-Hui E-mail: 2010200015@cugb.edu.cn;guo_lianghui@163.com

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	Jing YANG
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Cite this article:

Jing YANG,Liang-Hui GUO. A modified interpolation-iteration method for gravity anomaly continuation from undulating surface to plane[J]. Geophysical and Geochemical Exploration, 2022, 46(1): 123-129.

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https://www.wutanyuhuatan.com/EN/10.11720/wtyht.2022.1403 OR https://www.wutanyuhuatan.com/EN/Y2022/V46/I1/123

The diagram of interpolation-iteration method for gravity anomaly continuation from undulating surface to plane

The workflow of the modified interpolation-iteration method

Undulating observation surface of theoretical model and its gravity anomaly
a—theoretical gravity anomaly at 0 m altitude;b—elevation of undulating observation surface;c—theoretical gravity anomaly at undulating observation surface

Comparison between the results of different interpolation-iteration methods and the gravity forward values of plane surface
a、b—the result of the routine interpolation-iteration method for continuation from undulating surface to plane and its deviation from the values of plane surface;c、d—the result of the modified interpolation-iteration method and its deviation from the values of plane surface

Different S comparison along profile A

The Bouguer gravity comparison before and after continuation from undulating surface to plane of Sichuan-Yunnan region
a—the elevation of Sichuan-Yunnan region;b—the denoised Bouguer gravity anomaly;c—the Bouguer gravity anomaly after continuation from undulating surface to plane by using the modified interpolation-iteration method;d—the anomaly deviations before and after continuation from undulating surface to plane

The gravity anomaly comparison and the elevation along profile B

The vertical derivative of Bouguer gravity comparison before and after continuation from undulating surface to plane of Sichuan-Yunnan region
a—the vertical derivative of Bouguer gravity anomaly;b—the vertical derivative of Bouguer gravity

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