【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。更多还原

【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 short-impending anomaly of SSQ-2I 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 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 oceur earthquake of over M7.0 in China,or M4.0 in Shanxi area.By the way,the reflecting performance to near-field earthquake of the broadband tiltmeter are better than that of quartz tiltmeter.更多还原