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?о???2003??2006???????????Sacks????????????峱??????????????????????????峱??????????????????????仯??????????????????????????????????????????????????0.533??????亯??????????????????????????????????????????????仯????????????????????????????????????????????????????6.28??10^-11/Pa??????亯?????????????????????????????????????????????????????????????????????????Ч????￡????????????????????????????????????????????????????????????????????????????????????????????????????й??

ANALYSIS OF INFLUENCE FACTORS ON DAILY WAVE OR SEMI DIURNAL WAVE OBSERVATION OF SACKS BODY STRAIN METER

We analyzed the relations between the observations with Sacks body strain meter and solid tide, atmospheric pressure, pumping and rainfall during 2003—2006 at Baodi seismostation in Tianjin. It is thought that the solid tide is the first major effect factor on the Sacks body strain observations, there is a synchronous, linear and normal correlation between them, their average value of monthly regression coefficient is 0.533, it’s time function has the annual variation characteristics. The daily or semi diurnal atmospheric pressure wave is the second major factor on the Sacks body strain observations, there is also synchronous, linear and normal correlation between them, their average value of monthly regression coefficient is 6.28×10 ^-11 /Pa, it’s time function have no obvious annual variation. Short time pumping near Sacks, will bring the synchronous normal interference to the daily wave, it is caused by ground water dynamics effect. Rainstorm will bring the synchronous rise of normal interference to daily wave, and the more heavy the rainfall is, the more clear this action is, it may be related with containing ample water stratum, good connectivity and dank character of the studied area.