信阳地震台DSQ型水管仪异常特征分析

THE ANALYSIS OF ABNORMAL CHARACTERISTICS ABOUT MODEL DSQ WATER TUBE TILTMETER OF XINYANG SEISMOSTATION

定点形变DSQ型水管仪通过记录台基的相对垂直位移来反映地壳形变,其数据波形的异常反映了观测环境的相应变化。2014年10月18日DSQ南北向数据出现大幅向南下滑的特征。本文通过实地调查取证,并根据前人成果计算钵体内损失的水量与山洞本身水分对灰岩墩轴向产生的膨胀应变值,然后再通过DSQ观测数据反推造成南北向异常的可能应变值,最后将两种应变值的大小进行对比研究。通过计算表明:灰岩轴向膨胀应变εz0应在[1.9168×10-3,5.2219×10-3]范围内,而通过DSQ反推的应变值εdsq约为4.6398×10-3,正好位于灰岩轴向应变之内。由此可大致判定此次异常的原因:在仪器北端礅附近,钵体与连通管结合部渗漏微量的水,渗漏水进入仪器墩体,使北端墩体膨胀,造成南北分量向南倾斜。

The model DSQ water tube tiltmeter relative vertical displacement of stylobate, and of fixed-point deformation records crustal deformation by its data waveform could reflects environment changes. On October 18, 2014 the observation data of south-north components showed sharp decline in south. Through on- the-spot investigation, and based on the previous study, we calculated water loss content in glass container and limestone expansion strain value from water in the cave. Then by calculating strain values from DSQ observation data of north-south, finally we would contrast two kinds of strain values. The xial expansion strain values of limestone e z0 by calculating shows it is [1.9168×10-3,5.2219×10-3], and the strain value εdsq is 4.6398×10-3 by back calculating the DSQ data, Which two kinds of strain values are fit highly. Therefore we could determine the abnormal causes： the glass container of instrument near the communicating pipe exists leakage problem of trace amounts of water, which water seepage into the instrument, and the limestone suffers from expansion, so it finally caused the abnorm of north-south component.