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STUDY ON CHARACTERS OF FIXED DEFORMATION ANOMALIES BEFORE THE SUIZHOU-XINYANG M_L4.2 EARTHQUAKE

An earthquake (M L=4.2) occurred in the boundary area between Xinyang, Henan and Suizhou, Hubei on January 28,2000. Xinyang seismic station is located on northeast of the epicenter with a distance of 35 km and in the same fault with the source.Several kinds of medium short term and impending earthquake anomalies of the fixed crust deformation are recorded in the station before the event.The study results indicate that variations of the observation values before the event are larger.The observation values of EW by water tube tiltmeter changed in reverse from June,1999 and changed acceleratively three days before the event.The values of NS by the meter changed acceleratively from March,1999 and jumped suddenly 5～8 days before the event.The values of EW and NS by horizontal pendulum tiltmeter changed in reverse respectively from February and June,1999 and fluctuated quasi periodically about 20 days before the event.Moreover,the obvious anomalies of the deformation tide factor from the station arised too before the event.