Abstract: Among 188 M_S≥5.0 earthquakes occurred in china's mainland from 1966~1999, 446 fluid anomalies are recognized from 23 earthquake cases in which the fluid anomaly terms for each case are lager than or equal to 10. Then spatio-temporal distribution is statistically analyzed according to time sequences and space zones. The results hold that the stage character is obvious observed in Southwest China, North China, and Southwest China, in spite of time sequences or space zones. On the contrary, in Northwest China fluid anomalies concerned earthquake case are less recognized. The results accord well with the integrated distribution characteristics of fluid anomalies and the regional anomalous distribution characteristics of earthquake cases in China.

Key words: Earthquake cases in China, Chinese mainland, Fluid anomaly, Statistical characteristics