2023年12月18日甘肃积石山6.2级地震前地电阻率变化分析

doi:10.12196/j.issn.1000-3274.2024.04.006

摘要/Abstract

摘要： 2023年12月18日, 甘肃积石山发生了6.2级地震, 震中300 km范围内有9个地电阻率固定观测站。本研究梳理了震前2～4年地电阻率观测资料, 在扣除年变化和趋势变化基础上, 分析震前异常变化情况。震前临夏、定西和通渭的地电阻率值均呈现趋势性下降和年变幅减小的形态, 下降幅度分别为4.9% (距震中44 km)、 1.2% (距震中164 km)和0.6% (距震中232 km), 且地震均发生在下降回转时段内。异常形态与大量震例统计结果一致, 且距离震中越近, 异常变化幅度越大。表明这3个台站的地电阻率变化与此次积石山6.2级地震的孕育存在关联。研究还发现, 距离震中219 km的金银滩地震观测台没有明显震前异常现象, 后续将结合台站实际电性结构和断层分布进一步分析。

关键词: 2023年积石山6.2级地震, 地电阻率, 年变化, 异常变化

Abstract: The M_S6.2 earthquake occurred in Jishishan County, Gansu Province, on December 18, 2023. Within a 300 km radius of the epicenter, there were 9 fixed geo-electrical resistivity observation stations. This study preprocessed the geo-electric resistivity observation data from 2 to 4 years before the earthquake, then analyzed the anomalous changes before the earthquake after eliminating annual and trend changes. It showed a declining trend in ground resistivity and a reduction in the annual variation amplitude before the earthquake at Linxia Station, Dingxi Station, and Tongwei Station, with decreasing magnitudes of 4.9% (44 km), 1.2% (164 km), and 0.6% (232 km) respectively. Earthquakes occurred during the declining reversal period. These anomaly patterns are consistent with statistical results from a large number of earthquake cases. Moreover, the closer the distance to the epicenter, the greater the magnitude of the anomaly change. This indicates that the changes in geo-electrical resistivity at these three stations are related to the M_S6.2 earthquake in Jishishan. It was also found that there was no obvious pre-seismic anomaly at the Jinyintan seismic station, which is 219 km away from the epicenter of the earthquake. Further analysis will be conducted in conjunction with the station’s actual electricity structure and fault distribution.

Key words: The 2023 Jishishan M_S6.2 earthquake, Geo-electrical resistivity, Annual variation, Anomalous variations

中图分类号:

P315.7

张宇, 柯浩楠, 娄晓宇, 胡颢迪. 2023年12月18日甘肃积石山6.2级地震前地电阻率变化分析[J]. 地震, 2024, 44(4): 82-96.

ZHANG Yu, KE Hao-nan, LOU Xiao-yu, HU Hao-di. Analysis of Changes in Geo-electrical Resistivity before the Jishishan M_S6.2 Earthquake in Gansu Province on December 18, 2023[J]. EARTHQUAKE, 2024, 44(4): 82-96.

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