2022年6月1日芦山MS 6.1地震前地电阻率异常分析

利用归一化速率变化方法（NVRM）分析处理了芦山M_S 6.1地震震中距450 km范围内的成都地震基准台、冕宁地震台、红格地震台、甘孜地震台等4个台站的地电阻率观测数据，结果显示：红格地震台NS、EW测道及甘孜地震台NE测道原始数据震前出现年变趋势性下降，下降幅度为1%—3%；红格地震台NVRM曲线震前出现正异常，冕宁地震台、甘孜地震台出现负异常，曲线转折下降过程中发生芦山M_S 6.1地震。虽然整体而言提取出的地电阻率震前异常在时间上与此次地震对应关系较好，但甘孜地震台、红格地震台与此次地震震中间距离均大于300 km，提取出的异常是否为此次地震异常，还需进一步探究。

Anomaly analysis of apparent resistivity before the June 1, 2022 Lushan MS 6.1 earthquake

The normalized rate variation method (NVRM) was used to analyze and process the apparent resistivity observation data of four seismic stations in Chengdu, Mianning, Hongge and Ganzi within 450 km from the epicenter of the Lushan M_S 6.1 earthquake. The results show that the raw data of the tracks NS and EW of Hongge Seismic Station and the track NE of Ganzi Seismic Station showed an annual trend decline before the earthquake, and the decline range was 1%-3%. The NVRM curve of Hongge Seismic Station showed positive anomalies, and negative anomalies occurred in both Mianning and Ganzi seismic stations. The Lushan M_S6.1 earthquake occurred during the curve turning and descending process. Although the extracted pre-earthquake anomalies of the apparent resistivity show a good relationship with the earthquake, the distance from the Ganzi and Hongge seismic stations to the epicenter of this earthquake is more than 300 km. Therefore, whether the anomalies are precursory of the Lushan earthquake requires further research and exploration.