襄樊地震台YRY-4钻孔应变仪干扰特征分析

Analysis of Interference Characteristics of Seismostation YRY-4 Borehole Strain Gauge in Xiangfan

高精度的分量钻孔应变观测在日常观测过程中不可避免地会受到各种内在或外在因素的干扰,致使数据曲线出现各种异常。为准确区分干扰异常及地震前兆异常,通过分析近10a襄樊台分量钻孔应变仪的观测数据资料,结合地震前兆异常跟踪分析成果可知,襄樊台分量钻孔应变仪工作状态良好,固体潮变化形态清晰,映震效果良好,可记录到近些年发生的中强震,日常观测中主要受自然环境、供电故障、仪器故障、人为标定等因素的干扰,分析各种干扰在应变观测曲线上的对应变化特征,准确区别于地震前兆异常特征,为地震分析预报工作提供一定的参考依据。

High precision component borehole strain observation is inevitably disturbed by all intrinsic or extrinsic factors,causing abnormity in data curve.In order to precisely distinguish abnormal disturbance and abnormal seismic precursor,we analyzed observed data of seismostation borehole strain gauge in Xiangfan in last ten years and earthquake precursor anomaly tracking analysis results.Seismostation borehole strain gauge in Xiangfan is in good condition with clear solid tide variation and good reflection effect,which can record medium & strong earthquake in recent years.The main disturbed factors are natural environment,power failure,instrument failure and manual calibration.Reference can be offered for earthquake analysis and forecast by analyzing features corresponding to all kinds of disturbance and exactly distinguish abnormal features before earthquake.