基于时变重力数据的川滇地区场源模型反演和解释

doi:10.12196/j.issn.1000-3274.2021.01.016

Abstract

Abstract: Time-variable Gravity changes is a reflection of disproportion changes from inner earth media. Based on the 3-D euler deconvolution method, this study calculates the optimum inversion parameters by establishing a suitable field-source model, and the divergent solutions has been eliminated by the method of horizontal gradient filtering. On the basis of relative gravity observations of Sichuan-Yunnan region from 2015 to 2019, we have systematically analyzed the dynamic change of regional gravity field from different spatial-temporal scale. Then the qualitative and quantitative research of regional gravity changes field-source feature has been carried out. The results shows that: 3-D spatial distribution characteristic of field-source can be inversed by euler deconvolution method, and the inversed results are consistent with the epicenter of Xingwen M_S5.7 earthquake on Dec. 16^th, 2018, Changning M_S6.0 on Jun. 17^th, 2019 and Gongxian M_S5.6 earthquake on Jul. thd, 2019. This study also reveals the tectonic activity characteristics of this region, and provides some reference to understand the changes of mediators during the process of earthquake preparation and tectonic movement. Meanwhile, it is also meaningful to medium and long term forecast of strong earthquake.

Key words: Time-variable Gravity changes, Euler deconvolution, Field-source model inversion, Sichuan-Yunnan

CLC Number:

P315.7

ZHENG Qiu-yue, WANG Qing-hua, LIU dong, HUANG Jiang-pei, CHEN Shi. Inversion and Interpretation of Field-source Model Based on the Regional Time-variable Gravity Variations of Sichuan-Yunnan Region[J]. EARTHQUAKE, 2021, 41(1): 205-218.

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Inversion and Interpretation of Field-source Model Based on the Regional Time-variable Gravity Variations of Sichuan-Yunnan Region

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