PRELIMINARY STUDY ON THE TREND OF FRACTURE ACTIVETIES ACCORDING TO THE GROUNDWATER LEVEL CHANGES IN RECENT TEN YEARS IN TIANJIN AREN

Based on the achievements in seismological fluid research, we analysed the time and space patterns of groundwater level anomalies in the period of 1985-1994 in Tianjin area, the main results are as follows:(1) The 1989 Datong earthquake with Ms6.1 shows a adjusting change of regional tectonic activitIes;(2) The Cangdong fractured zone is still a main active fractured zone in Tianjin area;(3) It is found that the stress concentration position in Cangdong fractured Zone showed a kind of transfered trace from the southwestern section to the northeastern section.