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本文处理了云南及邻近地区1976年以来7次5.4—7.4级地震前后的电阻率观测资料。分析统计这些地震前电阻率异常时间、幅度和范围的结果表明,7级以上地震电阻率的长趋势异常时间为1—2年,异常幅度5%左右;短临异常时间1—2个月,最大异常幅度10.8%;最大异常范围290公里。6级地震的中期异常时间一般在1年以内,异常幅度2—6%,短临异常时间一般为1个月,异常幅度2.5—11.8%,最大异常范围220公里。5级地震无长趋势异常,短临异常时间一般为1个月左右,异常幅度3%左右,异常范围在220公里以内。
This paper deals with the resistivity observations before and after the 7 earthquakes of 5.4-7.4 magnitude in Yunnan and its adjacent areas since 1976. The analysis of the time, amplitude and range of resistivity anomalies before these earthquakes shows that the long-term trend anomaly of earthquakes with magnitude above 7 is 1-2 years and the anomaly amplitude is about 5%; the anomalous short-term anomalies are 1-2 months, The maximum anomaly range 10.8%; the maximum anomaly range 290 km. Mid-term anomalies of magnitude 6 earthquakes are generally within 1 year, with anomalous magnitude of 2-6%, short anomalies typically 1 month, anomalies of 2.5-11.8% and a maximum anomaly range of 220 kilometers. There is no long-term trend anomalies in the magnitude 5 earthquake. The duration of short-term anomalies is generally about 1 month with an anomaly of about 3% and the anomaly range is within 220 km.