易县地震台TJ-2体积式应变仪观测资料分析

Analysis of observation data of TJ-2 volumetric strain gauge at Yixian seismic station

本文选取易县地震台2020—2022年TJ-2体积式应变仪监测数据,对该时段体应变数据的连续性、完整性、年漂移量、精度进行分析。通过分析自然天气变化、观测系统故障、人为干扰对监测数据的影响,讨论易县地震台TJ-2体积式应变仪的映震能力。研究表明:①易县地震台TJ-2体积式应变仪运行状态良好且监测数据质量较高;②自然天气变化(降雨、气压)是影响易县地震台TJ-2体积式应变仪监测数据的主要干扰因素,并且体应变对气压变化的反应更加灵敏,体应变主测项与气压呈相同趋势性变化;③TJ-2体积式应变仪对全球M_(S)≥7.0以及国内M_(S)≥6.0地震同震响应极其明显,并且震级越大、震中距越近,监测数据曲线同震响应持续时间越长。由于易县地震台TJ-2体积式应变仪安装时间较早,线路老化严重且台站仪器架设电路杂乱,电路干扰情况时有发生,需对仪器供电线路进行优化,有助于提升观测数据的质量。

This article selected the monitoring data of the TJ-2 volumetric strain gauge at Yixian seismic station from 2020 to 2022,and analyzed the continuity,completeness,annual drift,and accuracy of the volumetric strain data during this period.By analyzing the impact of natural weather changes,instrument failures,and human interference on the monitoring data,the article discussed the observation and seismic reflection ability of the Yixian seismic station.The conclusion incledes:①The TJ-2 volumetric strain gauge at Yixian seismic station operates well and has high monitoring data quality.②Natural weather change(rainfall,atmospheric pressure)are the main interfering factors affecting the monitoring data of the TJ-2 volumetric strain gauge.③The TJ-2 volumetric strain gauge exhibits extremely significant co-seismic responses to earthquakes with global M_(S)≥7.0 and domestic M_(S)≥6.0.The larger the magnitude and closer the epicenter distance,the longer of the duration of the monitoring data curve’s co-seismic response.Due to the early installation time of the TJ-2 volumetric strain gauge at Yixian seismic station,severe aging of the line,and disorderly installation of the station’s instrument circuits,circuit interference often occurs.Therefore,it is necessary to optimize the instrument’s power supply line to improve the quality of observation data.