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Yingcheng earthquake,gravity changes,Xiangfan-Guangji fault,"/>
The Gravity Changes before the M4.9 Earthquake in Yingcheng County
Abstract We process and analyze the repeated gravimetry network data of Hubei province and its adjacent area. 14 long-term and short-term gravity change maps are obtained from Sep 2016 to Sep 2019. We analyze the gravity changes characteristics before Yingcheng M4.9 earthquake on December 26, 2019. The results show that: 1) The Xiangfan(Xiangyang)-Guangji(Wuxue) fault is related to Yingcheng M4.9 earthquake. It is in the transition zone between positive and negative gravity anomaly. 2) There is an abnormal rise and fall of gravity before the earthquake. It occurs during the fall process. 3) The earthquake pregnancy spans a long period of time, which is similar to Zigui M4.5 and M4.1 earthquakes on October 11, 2018. The similarity may be related to the fact that the activity of active faults in Hubei and Hunan province is weak; their movement amount is small and their stresses are often hard to concentrate.
