地电场方法在川滇地区地震观测中的应用
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摘要
利用云南省(5个)和四川省(4个)"十五"期间布设的地电场观测数据,利用大地电场观测系统中,同一测向长短极距测值的比值方法进行分析,发现能够较好地排除来自大地电场及自然电场远场的变化信息,突出可识别的地震前兆异常信息。研究结果表明:在剔除各种环境和空间电流体系的影响因素后,提取了与地震有关的异常信息,在川滇地区5.0级地震前,多数台站的地电场观测资料比值发生异常变化,异常大多出现在地震前0.5—3个月,其中汶川地震和姚安地震前,研究区的9个台站均出现异常。
Using the ratio method of long and short spacing the measured value in same telluric electric field, the telluric electric field observation data in total 9 stations in Yunnan and Sichuan provinces during 2006 to 2010 are analyzed. It is found that the method can exclude the variety information from the telluric electric filed and natural electric field, highlighting the seismic anomaly with identifiable information. The results show that: excluding various environmental and spatial factors influence the current system, the anomaly information on earthquakes is extracted. Before the M 5.0 earthquakes in the Sichuan-Yunnan region, most stations, the ratio of electric field observations changes abnormally in most of stations. The anomalies occur usually 0. 5—3 months before the earthquakes. Before Yao an and Wen-chuan earthquakes, anomalies appeared in all of 9 stations in the study area.
Using the ratio method of long and short spacing the measured value in same telluric electric field, the telluric electric field observation data in total 9 stations in Yunnan and Sichuan provinces during 2006 to 2010 are analyzed. It is found that the method can exclude the variety information from the telluric electric filed and natural electric field, highlighting the seismic anomaly with identifiable information. The results show that: excluding various environmental and spatial factors influence the current system, the anomaly information on earthquakes is extracted. Before the M 5.0 earthquakes in the Sichuan-Yunnan region, most stations, the ratio of electric field observations changes abnormally in most of stations. The anomalies occur usually 0. 5—3 months before the earthquakes. Before Yao an and Wen-chuan earthquakes, anomalies appeared in all of 9 stations in the study area.
引文
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Telescal L,Colangelol G,Hattori K,et al.Principal component analysis of geoelectrical signals measured in the seismically active area of Basilicata Region(southern Italy)[J].Natural Hazards and Earth System Sciences,2004,4:663-667．
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黄清华,刘涛.新岛台地电场的潮汐响应与地震[J].地球物理学报,2006,49(6) :1745-1754．
马钦忠,冯志生,宋治平,等.崇明与南京台震前地电场变化异常分析[J].地震学报,2004,26(3) :304-312．
钱复业,赵玉林,卢军,等.孔压弱化失稳的系统辨识及大地电场短临地震前兆//石特临主编:地震地电学发展与展望[M].兰州大学出版社,1998:151-155．
钱家栋,林云芳.地震电磁观测技术[M].北京:地震出版社,1995:1-326．
邵永新,王俊国.2006年7月4日文安5． 1级地震短临预测的实践[J].地震,2008,28(2) :108-114．
田山,王建国,徐学恭,等.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．
张学民,郭学增,郭建芳.晋冀蒙交界地区强震前的电场异常[J].地震地质,2005,27(3) :420-428．
赵和云,朱涛.孕震过程中冲流电位地电异常的理论研究[J].地震学报,2001,23(4) :198-406．
赵玉林,卢军,张洪魁,等.电测量在中国地震预报中的应用[J].地震地质,2001,23(2) :277-284．
Dologhiu E.A three year continuous sample of fficially documented predictiots issued in Greece using the VAN method[J].Tectonphysics,1993,224:189-202．
Telescal L,Colangelol G,Hattori K,et al.Principal component analysis of geoelectrical signals measured in the seismically active area of Basilicata Region(southern Italy)[J].Natural Hazards and Earth System Sciences,2004,4:663-667．
Varotsos P,Sarlis N,Skordas E,et al.Additional evidence on some relationship between seismic electric signals and earthquake souee parameters[J].ACTC Geophysiea Polonica.2005,53(3) :293-298．
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