CHARACTERISTIC OF SUBSURFACE FLUID DATA IN LINTONG SEISMOSTATION AND ITS PRECURSORY ANOMALIES BEFORE HONGDONG M5.0 EARTHQUAKE IN SHAANXI PROVINCE

The characteristics of subsurface fluid anomalies in Lintong Seismostation before Hongdong earthquake is analyzed with difference,filtering,fitting,period eliminating method.The results show that the water radon and water temperature anomalies in Lintong Seismostation are mainly moderately long term and short term anomalies,and dissolved vapor anomalies are mainly imminent anomalies.