Three-dimensional gravitational and magnetic-data acquisition and analysis via a joint-gradient Euler-deconvolution meth
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Three-dimensional gravitational and magnetic-data acquisition and analysis via a joint-gradient Eulerdeconvolution method* Ma Guo-Qing1, Yong Xiao-Yu1, Li Li-Li1, and Guo Hua2 Abstract: Three-dimensional (3D) gravitational and magnetic exploration is performed using aerial measurement tools, however, this has difficulties with measuring-height design and the construction of a joint-interpretation scheme. At present, the height in such experiments is set according to the measurement scale, and the distribution characteristics of anomalies are not fully considered. Here, we present the idea of using the attenuation characteristics of a singular-value spectrum to evaluate the contributions of various measurement heights and multi-height combinations for inversion to correctly and reasonably design appropriate measuring heights and the number of various measurement heights to be set. The jointgradient Euler-deconvolution method can accurately obtain the distribution of geological bodies from 3D gravitational and magnetic data at an improved resolution, and experimental tests confirm these findings. Therefore, an actual 3D aeromagnetic-data-acquisition and inversion test were carried out in the vicinity of the Zhurihe Iron Mine in Inner Mongolia. The flight-height difference was set to 60 m, and the specific distribution of lodes was obtained by the joint-gradient Euler-deconvolution method. This provides a reliable basis for future detailed exploration and proves that the methods presented in this paper have good practicalapplication effects and prospects. Keywords: Three-dimensional; gravity and magnetic exploration; singular value; gradient Euler deconvolution
Introduction At present, gravitational and magnetic-data acquisition is mostly performed by the land-exploration method or by aerial exploration at a single flight altitude, which is
insufficient to find the vertical-variation characteristics of anomalies. Airborne gravity and magnetic measurement can obtain data with different heights, enabling 3D gravitational and magnetic exploration (Nunez Nikitin, 2006; Wang et al., 2017; Meng et al., 2018), allowing vertical change to be determined and more geological-
Manuscript received by the Editor October 24, 2018; revised manuscript received March 9, 2020. *This work was supported by the National Key Research and Development Program of China (Nos. 2017YFC0602203, 2017YFC0601606, 2017YFC0601305, and 2017YFC0602000), National Science and Technology Major Project task (No. 2016ZX05027-002-003), National Natural Science Foundation of China (No. 41604098), and State Key Program of National Natural Science of China (No. 41430322). 1. College of Geoexploration Science and Technology, Jilin University, Changchun 130021, China. 2. China Aero Geophysical Survey and Remote Sensing center for Land and Resources, Beijing 100083, China. ♦Corresponding author: Li Li-Li (Email: [email protected]) © 2020 Chinese Geophysical Society. All rights reserved.
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