抚顺地震台洞体应变异常变化综合分析

Comprehensive Analysis of the Abnormal Strain Changes in the Cavern of Fushun Seismic Station

抚顺地震台SS-Y洞体应变观测NE分量自2016年8月出现压性转张性变化,在2017年1月开始出现明显的张性转压性变化且变化速率较快,至今已持续15个月时间。在排除仪器工作状态、仪器主机、数据采集器、放大器、降雨量、周边环境变化等方面干扰后,利用仪器对比、数字滤波及周期分析等方法深入研究异常变化的可靠性及真实性。经分析认为该异常的压性变化真实可靠,但对比其他仪器认为其速率变化可靠性低,故认为该仪器变化异常信度不高。

Since August,2016,the strain observed NE component of SS-Y cavern in Fushun Seismic Station has undergone compressive extensional change.In January,2017,it began to change conversely and the rate of change is fast,it has lasted for 15 months.In this paper,excluding the instrument working state,instrument host,data collector,amplifier,rainfall,surrounding environmental changes and other aspects of interference,the reliability and authenticity of abnormal changes are studied by means of instrument comparison,digital filtering and periodic analysis.It is analyzed that the abnormal compressive change is true and reliable,but compared with other instruments,the reliability of the rate change is low,so it is considered that the abnormality of the instrument change is not high.