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地震 ›› 2023, Vol. 43 ›› Issue (3): 102-119.doi: 10.12196/j.issn.1000-3274.2023.03.008

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2022年青州ML4.1地震前后的重力场变化分析

郑家军1,2, 李铂1, 朱成林3, 黄金水2, 杨立涛1, 董敏1, 熊玮1, 韩博1, 刘海林1, 池国民1, 吴婧1   

  1. 1.山东省地震局潍坊地震监测中心站, 山东 潍坊 261041;
    2.中国科学技术大学地球和空间科学学院, 安徽 合肥 230041;
    3.山东省地震局, 山东 济南 250014
  • 收稿日期:2022-12-27 修回日期:2023-05-09 出版日期:2023-07-31 发布日期:2023-08-28
  • 通讯作者: 李铂, 高级工程师。 E-mail: 63899166@qq.com
  • 作者简介:郑家军(1987-), 男, 山东青州人, 工程师, 在读硕士研究生, 主要从事地震监测研究。
  • 基金资助:
    山东省地震局一般科研项目(YB2317)、 中国地震局震情跟踪定向工作任务(2023010203)、 中国地震局地震监测、 预报、 科研三结合课题(3JH-202201067)

Analysis of the Change of Gravity Field before and after the 2022 Qingzhou ML4.1 Earthquake

ZHENG Jia-jun1,2, LI Bo1, ZHU Cheng-lin3, HUANG Jin-shui2, YANG Li-tao1, DONG Min1, XIONG Wei1, HAN Bo1, LIU Hai-lin1, CHI Guo-min1, WU Jing1   

  1. 1. Weifang Earthquake Monitoring Center station, Shandong Earthquake Agency, Weifang 261041, China;
    2. School of Earth and Space Sciences, University of Science and Technology of China, Hefei 230041, China;
    3. Shandong Earthquake Agency, Ji'nan 250014, China
  • Received:2022-12-27 Revised:2023-05-09 Online:2023-07-31 Published:2023-08-28

摘要: 以2022年青州ML4.1地震为研究目标, 根据先前学者总结的区域重力场变化在大震孕育发生中的异常特征, 通过计算相邻两期重力变化、 累计重力变化的方式, 分析了震中附近变化的空间尺度和数量级。 本文分析了区域重力场变化显著地区的测点单点变化情况, 包括高炳西、 济南站、 王坟及庙子等测点, 以及高炳西场地南北两测点重力差的变化情况。 根据高炳西场地南北两测点周边干扰情况, 包括降水量、 地面沉降、 地形改正等, 分析了该两测点重力差变化的原因。 本文认为青州ML4.1地震发震前后的重力场有变化, 且该变化与地震孕育发生导致的地下物质迁移有关。

关键词: 流动重力, 时空变化, 降水量, 2022年青州ML4.1地震

Abstract: In this paper, the 2022 Qingzhou ML4.1 earthquake was taken as the research target. According to the abnormal characteristics of regional gravity field changes in the preparation and occurrence of large earthquakes summarized by previous scholars, the spatial scale and order of magnitude of changes near the epicenter were analyzed by means of calcalating gravity changes in two adjacent periods and cumulative gravity changes. The variation of the single point of the measuring points in the area with significant variation of regional gravity field, including Gaobingxi, Jinan Station, Wangfen and Miaozi, as well as the variation of gravity difference between the north and south of the Gaobingxi site, was also analyzed. According to the surrounding disturbance of the two measuring points in the Gaobingxi site, including the precipitation, land subsidence and terrain correction, the reasons for the change of gravity difference between the two measuring points were analyzed. It is suggested that the gravity field changes before and after the Qingzhou ML4.1 earthquake, and the change is related to the underground material migration caused by the earthquake preparation and occurrence.

Key words: Mobile gravity, Spatiotemporal variation, Precipitation, The 2022 Qingzhou ML4.1 earthquake

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