临汾台峒体摆数字倾斜仪在忻州五寨4.2级地震前的异常特征分析  

ANALYSIS OF ANOMALIES OF DIGITAL CAVE TILTMETER AT LINFEN STATION REFLEETING THE WUZHAI M4.2 EARTHQUAKE,XINZHOU

作　　者：冯建琴[1,2] 吴艳霞[3] 沈晓松[2,4] 邓建梅 董甲弟[1,2] 

机构地区：[1]山西省地震局临汾中心地震台,临汾041000 [2]太原大陆裂谷动力学国家野外观测站,太原030025 [3]中国地震局地震研究所,武汉430071 [4]山西省地震局太原基准地震台,太原030025 [5]苏州市地安地震安全评估科技有限公司,苏州21512

出　　处：《大地测量与地球动力学》2011年第B06期24-27,共4页Journal of Geodesy and Geodynamics

基　　金：山西省地震局项目(20382)

摘　　要：2011年3月7日忻州五寨4.2级地震前,位于震中西南方向326.8 km外的临汾台的数字化峒体观测仪器,其记录曲线图出现了不同程度的突变、阶变、抖动现象。其中,SSQ-2 I石英摆、VP1、VP2宽带倾斜仪的短临异常现象较为明显。通过分析发现:SSQ-2I石英摆、VP1宽带摆、VP2宽带倾斜仪对近场地震有很好的映震性能,当石英摆NS分量潮汐因子≥0.79、EW分量潮汐因子≥0.39时,中国境内可能会发生7.0级以上地震,山西地区则有可能发生4.0级以上地震。VP1宽带摆、VP2宽带倾斜仪对近场地震的映震性能优于石英摆。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 short-impending anomaly of SSQ-2I quartz pendulum, broadband tihmeters VPI , VP2 were more evident. Through the analysis of these anomalies we can see that these tihmeters above mentinaed all have good performance reflecting near-field earthquake that when the tidal factor of quartz pendulum in NS direction is over 0.79 ,in EW over 0.39,there may occur earthquake of over M7.0 in China, or/1//4.0 in Shanxi area. By tile way, the reflecting performance to near-field earthquake of the broadband tihmeter are better than that of quartz tilt- meter.

关 键 词：突变 阶变 短临异常 矢量图 潮汐因子 

分 类 号：P315.726[天文地球—地震学]