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应用富氏滑动、归一化变化月速率等方法处理了2013年7月22日甘肃岷县漳县Ms6.6地震震中400km范围内9个地电阻率观测台2002—2013年的观测资料,研究了本次地震前的地电阻率变化。结果显示,尽管震中周围的地电阻率台站存在环境干扰等影响,但在本次地震前地电阻率异常变化仍然很明显,表现出震前以下降为主、大幅度异常的特点。最后初步讨论了本次地震前地电阻率异常变化的可能成因。
The observation data of 9 geoelectrical resistivity observation stations in the 400km range of Ms6.6 earthquake in Minxian County, Min County, Gansu, on July 22, 2013, were processed by using the method of Fu’s sliding and normalized monthly rate of change. The earth’s resistivity change before this earthquake. The results show that although the earth resistivity stations around the epicenter have environmental disturbances, the anomalies in the resistivity anomalies before the epicenter are still obvious, showing the characteristics of descending mainly and largely anomalously before the epicenter. Finally, the possible causes of the abnormal change of resistivity before earthquakes are discussed.