一种实测重力异常区域场的消除方法

doi:10.11720/wtyht.2021.0287

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Abstract

The measured gravity anomaly is a superimposed field composed of a regional field and a local field, whose characteristics is complex shape and various amplitude changes. In order to complete the geological task better, it is necessary to separate the regional field and the local field. Based on the the measured gravity anomalies, this paper studies the relationship separately between the elevation and free-air gravity anomaly, simple bouguer gravity anomaly, bouguer gravity anomaly. By the way of mathematical statistics to perform regression analysis, the regional field (background field) and the local field (remaining field) are separated which improves the credibility of the interpretation results of gravity data and provides basic services for analyzing and solving geological tasks.

Key words： measured gravity anomalies regression analysis correlational relationship regional field local field

Received: 22 February 2021 Published: 21 December 2021

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	Zheng-Ke WANG
	Lin LU
	Hua-Ting LIU

Cite this article:

Zheng-Ke WANG,Lin LU,Hua-Ting LIU. A way of eliminating the regional field of measured gravity anomalies[J]. Geophysical and Geochemical Exploration, 2021, 45(6): 1569-1577.

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https://www.wutanyuhuatan.com/EN/10.11720/wtyht.2021.0287 OR https://www.wutanyuhuatan.com/EN/Y2021/V45/I6/1569

The figure of regression analysis method

The different processed results of gravity data in area A
a—bouguer anomaly; b—regression residual anomaly from bouguer anomaly; c—contour map; d—residual anomaly calculated by field method on the basis of (a); e—residual anomaly calculated by field method on the basis of (b); f—correlation coefficient of (d) and (e).

The different processed results of gravity data in area B
a—bouguer anomaly; b—regression residual anomaly from bouguer anomaly; c—contour map;d—residual anomaly calculated by field method on the basis of (a); e—residual anomaly calculated by field method on the basis of (b);f—correlation coefficient of (d) and (e)

Comparison diagram of the relationship among the three regression residual anomalies in area C
a—regression residual anomaly on the basis of simple bouguer anomaly; b—regression residual anomaly on the basis of free-air gravity anomaly; c—regression residual anomaly on the basis of bouguer anomaly; d—correlation coefficient of (a) and (b); e—correlation coefficient of (b) and (c); f—correlation coefficient of (a) and (c)

Comparison diagram of the relationship among the three regression residual anomalies in area B
a—regression residual anomaly on the basis of simple bouguer anomaly; b—regression residual anomaly on the basis of free-air gravity anomaly; c—regression residual anomaly on the basis of bouguer anomaly; d—correlation coefficient of (a) and (b); e—correlation coefficient of (b) and (c); f—correlation coefficient of (a) and (c)

Comparison diagram of the relationship among the three regression residual anomalies with different starting point in area B
a、b—regression residual anomaly on the basis of simple bouguer anomaly; c—correlation coefficient on the basis of (a) and (b);d、e—regression residual anomaly on the basis of free-air gravity anomaly; f—correlation coefficient of (d) and (e);g、h—regression residual anomaly on the basis of bouguer anomaly; i—correlation coefficient on the basis of (g) and (h)

Comparison diagram of the relationship among the three regression residual anomalies with different starting point in area B
a、b—regression residual anomaly on the basis of simple bouguer anomaly; c—correlation coefficient on the basis of (a) and (b);d、e—regression residual anomaly on the basis of free-air gravity anomaly; f—correlation coefficient of (d) and (e);g、h—regression residual anomaly on the basis of bouguer anomaly;i—correlation coefficient on the basis of (g) and (h)

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