| 武汉九峰地震台重力变化与地壳垂直形变分析 |
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| 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. |
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| 作者姓名： | 王嘉沛 张新林 张毅 李忠亚 胡敏章 申重阳 |
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| 作者单位： | 1.中国地震局地震研究所，湖北 武汉, 430071 |
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| 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 |
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| 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。
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| 关 键 词： | 绝对重力变化 地壳垂直形变 比值 物质运动 武汉九峰地震台 |
| 收稿时间： | 2022-05-16 |
Analysis of Gravity Variation and Vertical Crustal Deformation at Wuhan Jiufeng Seismic Station |
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| Affiliation: | 1.Institute of Seismology, China Earthquake Administration, Wuhan 430071, China2.National Observation and Research Station of Gravitation and Earth Tide, Wuhan 430071, China3.Innovation Academy for Precision Measurement Science and Technology, Chinese Academy of Sciences, Wuhan 430077, China4.University of Chinese Academy of Science, Beijing 100049, China |
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| 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. |
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