Abstract After having deserved the significant gravity disturbance before the Kermadec Islands earthquake (Mw 7.1) on May 27,1997 at Zhongshan station in Antarctica with LacosteET21 gravimeter, and observed the similar disturbance before the Wenchuan earthquake ( Ms 8.0) on May 12,2008 at the Wuhan National Field Scientific Observation Station for Geodesy with LacosteET20 gravimeter. The analysis of the gravity data of the Wenchuan earthquake shows that the gravity disturbance had been gradually increasing since two days before the earthquake with the maximum amplitude of about 0.8×10 -8 ms -2. The observations of gravity disturbance before earthquake are reliable, as the anomaly was observed at different sites with different LacosteET gravimeters. It is concluded that the significant gravity disturbance appear usually about two days before some strong earthquakes with the amplitude of (1~2)×10-8 ms-2 and the period of 4-8 s.
