对汶川8.0级地震前四川地区地电地磁观测异常的分析与思考
|
摘要
研究了汶川8.0级地震前四川地区模拟和数字地电、地磁类观测资料。四川地区地电6台站的26测项模拟观测,在汶川8.0级地震前仅出现1项中期异常,异常台站比1/6=0.17;异常测项比为1/26=0.04。对"九五"到"十五"期间四川地区数字化改造或数字地电观测资料,没有分析检测出异常项。四川地区6个台的地磁垂直分量整点值的日变形态在震前2天出现波谷分裂的异常现象,由于平时出现此类异常频繁,若用于预测无统计学的显著意义。可见汶川8.0级地震前四川地区地电和地磁类观测资料结果出现的异常现象比例是极低的。同时对疑似或有争议的异常测项进行分析说明,对汶川8.0级地震前电磁类异常少的原因进行了讨论。
Among the geo-electrical data from seismic station in Sichuan Province,an item of middle-term anomaly before the 2008 Wenchuan M8.0 earthquake is identified.With the terms of anomaly ration,the anomaly ratio of seismic station is 0.17 and the anomaly ration of observation items is 0.04.For the items of the geo-electrical observation data included in the digitalized projects of the ninth Five-year Plane and the Tenth Five-year Plan in Sichuan Province,any anomaly changes were not found clearly.But 2 days before the 2008 Wenchuan M8.0 Earthquake,in the vertical component of observation data of geo-electrical field,the there were 6 anomaly changes of low point splitting of diurnal wave.Sine the same anomaly changes appeared often,the valuable character of such changes were not summarized with statistical meanings.We think that before the 2008 Wenchuan M8.0 Earthquake the anomaly changes ratio is very low.At the same times we discuss the connection between the 2008 Wenchuan M8.0 Earthquake and the geo-electrical observation data.
Among the geo-electrical data from seismic station in Sichuan Province,an item of middle-term anomaly before the 2008 Wenchuan M8.0 earthquake is identified.With the terms of anomaly ration,the anomaly ratio of seismic station is 0.17 and the anomaly ration of observation items is 0.04.For the items of the geo-electrical observation data included in the digitalized projects of the ninth Five-year Plane and the Tenth Five-year Plan in Sichuan Province,any anomaly changes were not found clearly.But 2 days before the 2008 Wenchuan M8.0 Earthquake,in the vertical component of observation data of geo-electrical field,the there were 6 anomaly changes of low point splitting of diurnal wave.Sine the same anomaly changes appeared often,the valuable character of such changes were not summarized with statistical meanings.We think that before the 2008 Wenchuan M8.0 Earthquake the anomaly changes ratio is very low.At the same times we discuss the connection between the 2008 Wenchuan M8.0 Earthquake and the geo-electrical observation data.
引文
[1]徐世浙.关于压磁效应和膨胀磁效应[J].地震学报,1979,1(1):76-8 l.
[2]郭自强,尤峻汉,李高,等.破裂岩石的电子发射与压缩原子模型[J].地球物理学报,1989,32(2):173-177.
[3]陈化然,杨冬梅,李琪,等.1980年以来我国电磁辐射地震前兆信息的观测与研究[J].中国地震,2008,24(2):180-186.
[4]钱复业,赵璧如,钱卫.汶川MS8.0地震的短临地电波动(潮汐力谐振和共振波2HRT波)前兆[J].国际地震动态,2008,355(7):1-9.
[5]田山,王建国,徐学恭,董洪军,崔晓峰,马骥.大地电场观测地震前兆异常提取技术研究[J].地震学报,2009,31(4):424-431.
[2]郭自强,尤峻汉,李高,等.破裂岩石的电子发射与压缩原子模型[J].地球物理学报,1989,32(2):173-177.
[3]陈化然,杨冬梅,李琪,等.1980年以来我国电磁辐射地震前兆信息的观测与研究[J].中国地震,2008,24(2):180-186.
[4]钱复业,赵璧如,钱卫.汶川MS8.0地震的短临地电波动(潮汐力谐振和共振波2HRT波)前兆[J].国际地震动态,2008,355(7):1-9.
[5]田山,王建国,徐学恭,董洪军,崔晓峰,马骥.大地电场观测地震前兆异常提取技术研究[J].地震学报,2009,31(4):424-431.
版权所有：© 2023 中国地质图书馆 中国地质调查局地学文献中心