【摘要】 20 0 0年 4月 2 9日 11时 5 4分 ,河南省南阳市内乡县马山口镇与镇平县寺山乡之间发生一次ML4 7级地震。地震前 3天 ,潢川台视电阻率 ρS 异常较为明显。分析了此次异常与内乡ML4 7级地震的关系 ,认为此次异常很有可能是内乡ML4 7级地震的短临前兆异常。当观测台站与震源位于同一构造带时 ,即便离震中较远 ,地电阻率对地震异常反映仍较灵敏 ,且与构造带同一走向的测向尤为明显更多还原

【Abstract】 The precursor anomaly feature of the earth-resistivity at Huangchuang Station before Neixiang earthquake M L4 7 occurred on April 49, 2000 has been studied in this paper. In three days before the earthquake the apparent earth-resistivity ρ S ,especially its the EW-direction component shows evident anomaly. The relationship between the anomaly and the earthquake is analyzed. The anomaly may be the precursor anomaly. Then the research results show that when the epicenter and the station is at same tectonic belt,even far away from each other,the earth-resistivity is sensitive to seismic anomaly.更多还原