特大远震引起的形变观测变化图像

THE CHANGE MAP OF DEFORMATION OBSERVATION AROUSED BY HUGE REMOTE EARTHQUAKES

利用定点长水管倾斜仪、石英伸缩仪、金属摆倾斜仪、石英摆倾斜仪连续观测资料对特大远震引起的震时和震后形变效应进行了分析。分析结果表明定点连续形变观测台网能记录到不同方位地震的震时脉冲信号,其持续时间半小时到4小时;同时还能记录到一些地震的阶跃信号。水平摆倾斜仪(金属摆、石英摆)观测值的震后效应表现为大幅漂移,持续时间几天到一个月。对由特大远震引起的形变观测变化图像出现差异的原因进行了讨论。另外对震时阶跃变化图像、定点形变观测仪器长趋势的漂移项、观测台站所处的地质构造三者之间的关系进行了讨论。

The deformation effect after huge remote earthquakes recorded by the continuum observational datum of fixed-point FSQ, SQ, JB and SSY tiltmeters was analyzed, the result showed, the station net of fixed-point continuum deformation observation could record different direction seismic impulse signals, the continuum time from half hour to 4 hours, in the same time, they could record the step signals. The effect after huge remote earthquakes recorded by tiltmeters was big excursion, the continuum time from several days to one month. The reason of different images of deformation observational changes aroused by huge remote earthquakes was discussed. Otherwise, the relation between the images of step change in the time of earthquake, long-tend excursion items of deformation observational equipments and the tectonics of observation stations region was discussed.