| 雷琼地区重力场动态变化特征研究 |
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| 引用本文： | 李 盛,廖桂金.雷琼地区重力场动态变化特征研究[J].大地测量与地球动力学,2020,40(11):1118-1125. |
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| 作者姓名： | 李 盛 廖桂金 |
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| 摘 要： | 基于2016年以来雷州半岛-海南岛陆地区（以下简称雷琼地区）的流动重力资料，对2017年下半年前后的联测资料采用不同的平差方法进行处理。将湛江和琼中2个绝对重力点作为雷琼测网基准，研究2016年以来雷琼地区重力场动态变化特征。重点研究2018-03-20广东阳江4.2级地震、2019-03-05广东雷州4.1级地震、2019-08-20海南三亚4.2级地震和2019-10-12广西北流5.2级地震震前区域重力场差分和累积动态变化。研究结果表明，除广东雷州4.1级地震外，其他3个地震震前在震中附近地区均存在重力场变化异常，表明在测网网格距和数据处理方法合理的情况下，对于4~5级地震，区域重力场在震前可能存在一定异常反应。
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| 关 键 词： | 流动重力 空间基准 重力场变化 地震 |
Study on the Dynamic Characteristics of Gravity Field in Leiqiong Area |
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| LI Sheng,LIAO Guijin.Study on the Dynamic Characteristics of Gravity Field in Leiqiong Area[J].Journal of Geodesy and Geodynamics,2020,40(11):1118-1125. |
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| Authors: | LI Sheng LIAO Guijin |
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| Abstract: | Based on mobile gravity observation data from Leiqiong area since 2016, we process the joint observation data in the second half of 2017 by using different adjustment methods. The Zhanjiang and Qiongzhong absolute gravity points are considered as the spatial reference of the Leiqiong survey network, and we study the dynamic changes of gravity field in Leiqiong area since 2016. We focus on the differential and cumulative dynamic changes of regional gravity fields before the 2018-03-20 Yangjiang M4.2, the 2019-03-05 Leizhou M4.1, the 2019-08-20 Sanya M4.2, and the 2019-10-12 Beiliu M5.2 earthquakes. The results show that there are abnormal changes in the gravity field near the epicenter before the earthquakes, except the Leizhou M4.1 earthquake. The results of this study indicate that the regional gravity field may reflect a certain preseismic anomalous of magnitude 4~5 earthquakes with reasonably dense observation networks and proper data processing methods. |
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| Keywords: | mobile gravity space reference gravity field change earthquake |
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