1)Linfen Central Seismostation，Earthquake Administration of Shanxi Province，Lingfen 0410002)Institute of Seismology, CEA,Wuhan 4300713)National Continental Rift Valley Dynamics Observatory of Taiyuan，Taiyuan 0300254)Taiyuan Seismostation of Shanxi Province，Taiyuan 0300255)Peaceful Earthquake Security Evaluation Science and Technology Limited Company,Suzhou 215128
Abstract Before the Xinzhou Wuzai 4.2 earthqauke on March 7,2011,the record curves of the digital cave tiltmeters at the Linfen station which is of 326.8 km away from the epicenter had abrupt change,step change and dithers.In which the shortimpending anomaly of SSQ2I quartz pendulum,broadband tiltmeters VP1,VP2 were more evident.Through the analysis of these anomalies we can see that these tiltmeters above mentinaed all have good performance reflecting nearfield earthquake that when the tidal factor of quartz pendulum in NS direction is over 0.79,in EW over 0.39,there may oceur earthquake of over \%M\%7.0 in China,or \%M\%4.0 in Shanxi area.By the way,the reflecting performance to nearfield earthquake of the broadband tiltmeter are better than that of quartz tiltmeter.
Feng Jianqin,Wu Yanxia ,Shen Xiaosong et al. ANALYSIS OF ANOMALIES OF DIGITAL CAVE TILTMETER AT LINFENSTATION REFLEETING THE WUZHAI M4.2 EARTHQUAKE,XINZHOU[J]. , 2011, 31(Supp.): 24-27.
Feng Jianqin,Wu Yanxia ,Shen Xiaosong et al. ANALYSIS OF ANOMALIES OF DIGITAL CAVE TILTMETER AT LINFENSTATION REFLEETING THE WUZHAI M4.2 EARTHQUAKE,XINZHOU[J]. jgg, 2011, 31(Supp.): 24-27.
