大同中心地震台钻孔应变数据异常调查分析

Investigation and Analysis on Abnormal Data of Borehole Strain Gauge at Datong Central Seismic Station

针对大同中心地震台YRY-4钻孔应变仪出现的短周期数据变化问题,通过分析异常数据的变化特征和自洽性,结合台站对数据变化原因的排查,排除了地球物理异常和仪器故障等因素的影响,认为该数据变化应为观测室电源内部线路磨损漏电导致。更换电源后,观测数据曲线恢复正常,提高了数据精度和观测质量。

Aiming at the problem of the short period data change in YRY-4 borehole strain gauge at Datong central seismic station,by analyzing the change characteristics and self-consistency of abnormal data and combining with the investigation of data change causes of stations,the influence of geophysical anomalies and instrument faults is eliminated.It is considered that the data change should be caused by the wear and leakage of internal circuit of power supply in observation room.After the power supply is replaced,the observation data curve returns to normal,and the data accuracy and observation quality are improved.