武汉九峰地震台重力变化与地壳垂直形变分析

王嘉沛, 张新林, 张毅, 李忠亚, 胡敏章, 申重阳

王嘉沛, 张新林, 张毅, 李忠亚, 胡敏章, 申重阳. 武汉九峰地震台重力变化与地壳垂直形变分析[J]. 武汉大学学报 ( 信息科学版), 2022, 47(6): 964-971. DOI: 10.13203/j.whugis20220157
引用本文: 王嘉沛, 张新林, 张毅, 李忠亚, 胡敏章, 申重阳. 武汉九峰地震台重力变化与地壳垂直形变分析[J]. 武汉大学学报 ( 信息科学版), 2022, 47(6): 964-971. DOI: 10.13203/j.whugis20220157
WANG Jiapei, ZHANG Xinlin, ZHANG Yi, LI Zhongya, HU Minzhang, SHEN Chongyang. Analysis of Gravity Variation and Vertical Crustal Deformation at Wuhan Jiufeng Seismic Station[J]. Geomatics and Information Science of Wuhan University, 2022, 47(6): 964-971. DOI: 10.13203/j.whugis20220157
Citation: WANG Jiapei, ZHANG Xinlin, ZHANG Yi, LI Zhongya, HU Minzhang, SHEN Chongyang. Analysis of Gravity Variation and Vertical Crustal Deformation at Wuhan Jiufeng Seismic Station[J]. Geomatics and Information Science of Wuhan University, 2022, 47(6): 964-971. DOI: 10.13203/j.whugis20220157

武汉九峰地震台重力变化与地壳垂直形变分析

基金项目: 

国家重点研发项目 2018YFE0206100

国家重点研发项目 2017YFC1500204

武汉引力与固体潮国家野外科学观测研究站开放研究基金 WHYWZ202108

详细信息
    作者简介:

    王嘉沛,博士生,助理研究员,主要从事地壳形变与重力变化的分析研究。wang_jia_pei@163.com

    通讯作者:

    张新林,博士生,助理研究员。xinlinzhang2012@163.com

  • 中图分类号: P223

Analysis of Gravity Variation and Vertical Crustal Deformation at Wuhan Jiufeng Seismic Station

Funds: 

The National Key Research and Development Program of China 2018YFE0206100

The National Key Research and Development Program of China 2017YFC1500204

Open Fund of Wuhan, Gravitation and Solid Earth Tides, National Observation and Research Station WHYWZ202108

More Information
    Author Bio:

    WANG Jiapei, PhD candidate, assistant researcher, specializes in crustal deformation and gravity variation. E-mail: wang_jia_pei@163.com

    Corresponding author:

    ZHANG Xinlin, PhD candidate, assistant researcher. E-mail: xinlinzhang2012@163.com

  • 摘要: 长期的重力变化和地壳形变观测是研究地下物质运动的重要手段。基于武汉九峰地震台2013—2020年的绝对重力和全球卫星导航系统(global navigation satellite system,GNSS)观测数据,计算了长期的重力与地壳垂直形变的变化趋势,并以1年、2年和3年的时间间隔分段,进行线性趋势拟合,分别获得不同时间段的绝对重力年变化率、地壳垂直形变速率以及对应的比值。研究结果表明,武汉九峰地震台长期的重力年变化率为0.479 9 μGal/a,地壳垂直形变速率为-1.2 mm/a, 两者的比值为-0.399 9 μGal/mm,与理论值存在一定的偏差,可能与该区域的地下水活动有关。将不同时间段的重力变化与地壳垂直形变的数据展布在一张图中,发现数据点离散分布在不同区域,由此可初步判断地下物质运动过程,为区域动力学机制解释提供参考。
    Abstract:
      Objectives  Long period observation of gravity variation and crustal deformation is one of the important means to study the movement of underground material. However, long-term monitoring of regional material migration law is rarely carried out.
      Methods  Based on the absolute gravity and global navigation satellite system (GNSS) observation data of Wuhan Jiufeng seismic station from 2013 to 2020, we calculate the variation trend of long-period gravity and vertical crustal deformation. The linear fitting trend is carried out at the intervals of 1 year, 2 years and 3 years, and the annual change rate of absolute gravity, vertical crustal deformation and the corresponding ratio in different time periods are obtained.
      Results  The results show that the long-term gravity change rate of Wuhan Jiufeng seismic station is 0.479 9 μGal/a, the vertical crustal deformation is -1.2 mm/a, and the ratio is -0.399 9 μGal/mm. There is a certain deviation from the theoretical value, which may be related to the groundwater activities in this area. It is found that the data points are discretely distributed in different regions and close to the theoretical value.
      Conclusions  Through the study of the long-term trend of gravity change and crustal deformation and the distribution map of different periodic data, the process of underground material movement can be preliminarily judged, which provides an important reference for the interpretation of regional dynamic mechanism.
  • 致谢: 感谢武汉九峰地震台、国家重力台网中心、中国科学院精密测量科学与技术创新研究院、中国地震局GNSS数据产品服务平台提供的数据支持和帮助。
  • 图  1   武汉九峰地震台概况

    Figure  1.   Overview of Wuhan Jiufeng Seismic Station

    图  2   绝对重力观测结果及其拟合

    Figure  2.   Results of Absolute Gravity Observation and Its Fitting Results

    图  3   重力垂直梯度长期变化趋势

    Figure  3.   Long-term Variation Trend of Gravity Vertical Gradient

    图  4   地壳垂直形变时间序列

    Figure  4.   Time Series of Vertical Crustal Deformation

    图  5   重力变化与垂直形变的比值统计

    Figure  5.   Statistics of Ratio of Gravity Variation to Vertical Deformation

    图  6   垂直形变-重力变化的点位分布图

    Figure  6.   Point Distribution Map of Vertical Deformation-Gravity Variation

    表  1   重力与形变的计算结果

    Table  1   Calculation Results of Gravity and Deformation

    时间间隔 观测时间 绝对重力年变化率/(μGal·a-1) 地壳垂直形变速率/(mm·a-1) 比值/(μGal·mm-1)
    1年 2013-06—2014-04 -5.7 5.7 -1.00
    2014-04—2015-05 12.1 7.3 1.65
    2015-05—2016-05 -1.0 -1.1 0.91
    2016-05—2017-06 -7.8 -2.2 3.54
    2017-06—2018-01 7.3 4.8 1.52
    2018-01—2019-04 0.6 4.3 0.14
    2019-04—2020-11 -2.0 -1.6 1.25
    2年 2013-06—2015-05 4.7 -1.6 -2.93
    2014-04—2016-05 6.7 -3.7 -1.81
    2015-05—2017-06 -5.0 -2.1 2.38
    2016-05—2018-01 -2.1 -6.9 0.30
    2017-06—2019-04 2.9 6.6 0.44
    2018-01—2020-11 -0.9 5.7 -0.16
    3年 2013-06—2016-05 4.0 -3.2 -1.25
    2014-04—2017-06 1.1 -4.3 -0.25
    2015-05—2018-01 -2.4 -4.3 0.55
    2016-05—2019-04 -0.2 1.9 -0.10
    2017-06—2020-11 0.6 6.4 0.10
    下载: 导出CSV
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  • 收稿日期:  2022-05-15
  • 网络出版日期:  2022-05-25
  • 发布日期:  2022-06-04

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