Variation of gravity before the Alxa Zuoqi M5.8 earthquake

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• 作者：Jianlin Feng^aAuthor Vitae ; Jin Wei^b ; ^c ; ^{pierce212@163.com" class="auth_mail" title="E-mail the corresponding author}Author Vitae ; Yujuan Tan^a ; Jianzeng Qin^a ; Bangwu Huang^a ; Ruyi Xie^a
• 关键词：Repeated gravimetry ; Gravity variations ; Alxa Zuoqi M5.8 earthquake ; High gravity gradient belt
• 刊名：Geodesy and Geodynamics
• 出版年：2016
• 出版时间：July 2016
• 年：2016
• 卷：7
• 期：4
• 页码：295-301
• 全文大小：1625 K

文摘

In this study, a classic survey adjustment computation method was used for data obtained in the Inner Mongolia and Ningxia gravimetric networks between September 2013 and April 2015 so as to investigate the variation of gravity before the Alxa Zuoqi M5.8 earthquake. The relationship between gravity variation and the Alxa Zuoqi M5.8 earthquake was analyzed. The results showed that: (1) the severe variation in gravity field at the test sites before the Alxa Zuoqi M5.8 earthquake, as well as the subsequent accelerated rising, might be an earthquake precursor; (2) the Alxa Zuoqi M5.8 earthquake occurred at the turning point where the high-gravity gradient zone changed from the NE direction to NW.