2022年天水井下地电阻率异常核实实例

A Case Study on the Virification of Borehole Apparent Resistivity Anomaly in Tianshui, 2022

摘要

20220616,天水井下地电阻率三向数据出现高频扰动,变化形态和幅度与20130420芦山M_S7.0、20130722岷县-漳县M_S6.6、20170808九寨沟M_S7.0地震前相似.通过资料收集整理、异常调查分析、干扰核实处理等工作,主要包括自然环境和场地环境调查、观测系统检定、工频干扰测试、干扰源确定、线路检修和运行监测等,发现此次天水井下地电阻率异常并非震前地球物理异常,而是变压器接地漏电电流与地电阻率测量供电电流耦合造成的高频扰动.此次异常核实案例可以为井下地电阻率台站供电线路规划、观测系统运维及漏电异常排查提供参考.

Abstract

On 16 June 2022, high-frequency disturbances were observed in the three-orientation borehole apparent resistivity data in Tianshui. Their change pattern and amplitude were similar to those observed before the 20 April 2013 Lushan M_S7.0, 22 July 2013 Minxian-Zhangxian M_S6.6, and 8 August 2017 Jiuzhaigou M_S7.0 earthquakes. Data collection and organization, anomaly investigation and analysis, and interference verification and treatment were conducted through a series of procedures, primarily including natural environment and site environment investigations, observational system verification, power frequency interference testing, identification of interference sources, line maintenance, and operational monitoring. It is found that Tianshui borehole apparent resistivity anomaly is not a pre-earthquake geophysical anomaly, but a high-frequency disturbance caused by the coupling of transformer grounding leakage current and the supply current during the instrumental measurement. This anomaly verification case provides a reference for power supply circuit planning, observation system maintenance and wire leakage anomaly investigation of borehole apparent resistivity stations.

关键词

地电阻率 / 高频扰动 / 异常核实 / 漏电干扰

Key words

apparent resistivity / high frequency disturbance / anomaly verification / leakage interference

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基金资助

甘肃省地震局地震科学发展基金野外站项目(2022Y03)

国家自然科学基金重点项目地震联合基金(U2039206)

中国地震局监测、预报、科研三结合课题(3JH202301005)