2022年芦山6.1级地震和马尔康6.0级地震前的重力变化特征

doi:10.12196/j.issn.1000-3274.2023.01.004

Abstract

Abstract: The gravity value of the Earth's surface will change accordingly in the process of earthquake preparation. We draw the contour maps of gravity field by using the mobile gravity observation data in Sichuan area from March 2018 to April 2022 and we study the variation characteristics of the gravity field before Lusan M_S6.1 earthquake and Maerkang M_S6.0 earthquake in 2022 by the contour maps. The results show: ① It was a period of intensive changes in gravity that about one and a half years before the Lusan M_S6.1 earthquake and Maerkang M_S6.0 earthquake. ② The Lusan M_S6.1 earthquake advanceed the occurrence of the Maerkang M_S6.0 earthquake; ③ The four quadrant area of the gravity variation contour before Lusan M_S6.1 earthquake and Maerkang M_S6.0 earthquake indicate a high concentration of stress in the area; ④ The epicenters of the Lusan M_S6.1 earthquake and Maerkang M_S6.0 earthquake were near the zero value line and has a large turning arc and are possible or high risk area for a large earthquake in the tectonic belt.

Key words: Contour map of gravity field, Variation characteristics of the gravity field, Four quadrant area, A large turning arc, High risk area

CLC Number:

P315.7

ZHENG Bing, MA Ling-li, WANG Wei-li, YI Tian-yang, WEN Jun-jun, LIU Hong-wei, CUI Jing-feng, ZHU Ren-guo, BAI Yun-bo. The Variation Characteristics of Gravity Field Before Lusan M_S6.1 Earthquake and Maerkang M_S6.0 Earthquake in 2022[J]. EARTHQUAKE, 2023, 43(1): 42-53.

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The Variation Characteristics of Gravity Field Before Lusan M_S6.1 Earthquake and Maerkang M_S6.0 Earthquake in 2022

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The Variation Characteristics of Gravity Field Before Lusan MS6.1 Earthquake and Maerkang MS6.0 Earthquake in 2022

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The Variation Characteristics of Gravity Field Before Lusan M_S6.1 Earthquake and Maerkang M_S6.0 Earthquake in 2022