山区地形改正密度逐次回归选取方法

doi:10.11720/wtyht.2021.0294

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Abstract

Bouguer gravity anomaly is constantly correlated with terrain in mountainous areas, which is unserviceable to geological interpretation of gravity data. This phenomenon is mainly caused by inaccurate terrain correction density. We ascertain the terrain correction density in mountainous areas based on regression analysis. We obtain the terrain correction density by analyzing the relationship between the free-air gravity anomaly and the elevation, and modify the density according to the relationship between the calculated Bouguer gravity anomaly in each step and the elevation. Based on this, we adjust the terrain correction density of topographic correction successively until we obtain the optimum terrain correction density and the corresponding Bouguer gravity anomaly. We have adopted the proposed method for the terrain correction of the gravity data in the Jiuzongshan mountain and obtained the optimum terrain correction density after 5 iterations, and thus the Bouguer gravity anomaly was calculated. The results of Jiuzhongshan mountain confirmed the correctness of our proposed method.

Key words： Bouguer gravity anomaly mountainous area terrain correction density

Received: 24 May 2021 Published: 21 December 2021

ZTFLH:

P631

Corresponding Authors: FENG Xu-Liang E-mail: totti_gao@163.com;fxlchd@163.com

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	Articles by authors
	Wei-Qiang GAO
	Zhao-Yang SHI
	Li-Ming ZHANG
	Xu-Liang FENG

Cite this article:

Wei-Qiang GAO,Zhao-Yang SHI,Li-Ming ZHANG, et al. Successive regression for determining the optimum terrain correction density in mountainous areas[J]. Geophysical and Geochemical Exploration, 2021, 45(6): 1530-1538.

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https://www.wutanyuhuatan.com/EN/10.11720/wtyht.2021.0294 OR https://www.wutanyuhuatan.com/EN/Y2021/V45/I6/1530

The topographic map obtained by UAV LiDAR survey in Jiuzong mountain and its adjacent area

The free-air gravity anomaly in the research area

The topography in the researched area

Statistics on the density of various rocks in the researched area

The gravity effects caused by terrain calculated using the actual density and the corresponding Bouguer gravity anomaly

Photos of surface outcrop overlooking (a~e) and long-range (f) at some survey sites in the study area

Scatter points shown the relationship between free-air gravity anomaly and elevation in the researched area

The gravity effects caused by terrain calculated using the first regressed density and the corresponding Bouguer gravity anomaly

Scatter points shown the relationship between free-air gravity anomaly and gravity anomaly caused by terrain in the researched area

Scatter points shown the relationship between first calculated Bouguer gravity anomaly and elevation in the researched area

The variation of the density and the correlation coefficient along with the iteration

The Bouguer gravity anomaly in the research area

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