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

WANG Jiapei; ZHANG Xinlin; ZHANG Yi; LI Zhongya; HU Minzhang; SHEN Chongyang

doi:10.13203/j.whugis20220157

Volume 47 Issue 6

Jun. 2022

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Geomatics and Information Science of Wuhan University > 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

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

WANG Jiapei^{1, 2, 3, 4,},
ZHANG Xinlin^{1, 2, ,},
ZHANG Yi^{1, 2},
LI Zhongya^{1, 2, 3, 4},
HU Minzhang^{1, 2},
SHEN Chongyang^{1, 2}

1.
Institute of Seismology, China Earthquake Administration, Wuhan 430071, China
2.
National Observation and Research Station of Gravitation and Earth Tide, Wuhan 430071, China
3.
Innovation Academy for Precision Measurement Science and Technology, Chinese Academy of Sciences, Wuhan 430077, China
4.
University of Chinese Academy of Science, Beijing 100049, China

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

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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
Received Date: May 15, 2022
Available Online: May 25, 2022
Published Date: June 04, 2022

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Abstract

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.
- absolute gravity variation,
- vertical crustal deformation,
- ratio,
- material movement,
- Wuhan Jiufeng seismic station

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