泸定M_(S)6.8地震前地电阻率的异常特征研究  

Characteristics of Anomalous Evolution of Ground Resistivity in Sichuan Region before the Luding M_(S)6.8 Earthquake

作　　者：廖晓峰 祁玉萍[1] 杨星 王玮铭 任越霞[1] 何畅[1] Liao Xiaofeng;Qi Yuping;Yang Xing;Wang Weiming;Ren Yuexia;He Chang(Sichuan Earthquake Agency,Chengdu 610041,China)

机构地区：[1]四川省地震局,成都61004

出　　处：《中国地震》2025年第1期126-136,共11页Earthquake Research in China

基　　金：中国大地震科学志(四川卷)编纂项目(2023FY10150204);2023年和2024年震情跟踪定向工作任务(2023010412,2024010413)共同资助。

摘　　要：对泸定M_(S)6.8地震前四川地区的地电阻率异常演化特征进行总结,发现不同时间阶段出现了不同的异常形态,主要有:①甘孜站、江油站、红格站3个台站在强震发生前的1~4.2年出现了长趋势变化的转折,目前多数测项已显示为持续性的趋势上升;②出现长趋势转折变化后,红格站、江油站分别在2020年11月、2021年4月出现了年变幅减小的现象;③甘孜站、江油站、冕宁站3个台站在泸定6.8级地震前出现了较为明显的中短期异常变化,震后3个台站的异常恢复,且再未出现此类异常变化。综上,长趋势变化的转折可能表明未来一段时间区域内强震风险升高,而加速上升/下降、反向变化等异常特征可能更具有中短期的指示意义。By analyzing the anomalous evolution of ground resistivity in the Sichuan region before the Luding M_(S)6.8 earthquake,distinct abnormal patterns were observed at different stages.The key findings are as follows:(1)Long-term trend reversals occurred at Ganzi,Jiangyou,and Hongge stations 1-4.2 years before major earthquakes,with most measurement indicators currently exhibiting a sustained upward trend.(2)Following these long-term trend shifts,Hongge and Jiangyou stations experienced reductions in annual variation in November 2020 and April 2021,respectively.(3)Significant short-term anomalies were detected at Ganzi,Jiangyou,and Mianning stations just before the Luding earthquake,after which these anomalies disappeared and did not recur.In conclusion,long-term trend shifts may indicate an increasing risk of strong earthquakes,while features such as accelerated rises/falls and sudden reversals could serve as more indicative signals in the medium to short term.

关 键 词：泸定M_(S)6.8地震 四川地区 地电阻率 趋势转折 短期异常 

分 类 号：P315[天文地球—地震学]