涉县地震台伸缩仪长短基线观测资料的对比分析

COMPARISON TO THE DIGITAL AND ANALOGUE OBSERVATIONAL DATA OF EXTENSOMETER IN SHEXIAN SEISMOSTATION

摘要: 对涉县地震台伸缩仪NS向(短基线)和EW向(长基线)的伸缩仪数字化改造前后的观测资料, 从记录资料的内在精度、潮汐因子和误差、年漂移量、格值重复精度等多方面进行了同分向和不同分向长短基线的对比分析, 结果发现, SS-Y型伸缩仪的基线长度在10~15m时能基本满足洞体应变观测要求, 且在某些方面还优于长基线, 因此对于山洞不长的台站, 也可以考虑安装该型伸缩仪。

Abstract: The observational data of extensometer(NS:short baseline;EW:long baseline) observed in Shexian Seismostation before and after reconstruction are compared and analyzed in the field of inherent precision, tidal factor and error, annual drifting and calibration repeat accuracy.The results show that SS-Y extensometer with 10~15m baseline can basically meet the need of observation in cave room, and is superior to long baseline in some aspects, so some stations that their cave is not long can consider to install this type extensometer.