川滇地区陆地流动重力测网场源分辨能力评估

doi:10.12196/j.issn.1000-3274.2021.01.015

Abstract

Abstract: Terrestrial gravity measurement is an important means of studying the interior material movement and mass changes in the crust, and the field source resolution is a key indicator to assess the monitoring efficiency of the mobile gravity network. In this paper, we studied the gravity network of Sichuan-Yunnan region, where the tectonic movement and seismicity is active. Based on the field source anomaly parameters and the distribution of measuring points of the network, we calculated the checkboard of gravity anomaly by Tesseroid model, and comparison of model anomalies recovered by Inverse-distance-weighting method, Kriging method and Least-square-collocation-method, respectively. On this basis, we evaluated the capacity of the field source resolution of the gravity network in Sichuan-Yunnan region, and obtained the gravity changes from 2014 to 2017 in the region. The results show that the Least-square-collocation-method is the optimal method to recover the gravity field in the Sichuan-Yunnan region. The spatial resolution of land-based mobile gravity network is better than 0.75°×0.75° in most of the Sichuan-Yunnan region, and in some area even to 0.25°×0.25°. The spatial resolution is 0.50°×0.50°in the first-order active block boundary zone, and that is better than 0.75°×0.75° in the second-order active block boundary zone. Lastly according to active block boundaries and gravity measurement points, we evaluated the capacity of the field source resolution of the land-based mobile gravity network in different zones in Sichuan-Yunnan region.

Key words: Terrestrial mobile gravity network, The capacity of field source resolution, Tesseroid model, The Least-square-collocation-method, Sichuan-Yunnan region

CLC Number:

P315.7

XU Wei-min, CHEN Shi, RUAN Ming-ming, YANG Jin-ling, HAN Jian-cheng, LI Hong-lei, LU Hong-yan. Evaluation of Field Source Resolution of Terrestrial Mobile Gravity Network in Sichuan-Yunnan Region[J]. EARTHQUAKE, 2021, 41(1): 191-204.

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Evaluation of Field Source Resolution of Terrestrial Mobile Gravity Network in Sichuan-Yunnan Region

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