2008年西藏4次M_S6.0以上地震前拉萨地电场异常信号特征
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摘要
2008年西藏发生了4次MS6.0以上地震,即1月9日改则MS6.9地震、8月25日仲巴MS6.8地震、9月25日仲巴县MS6.0地震、10月6日当雄MS6.6地震。通过检查和分析拉萨台观测资料,发现在这四次中强地震前都记录到了明显的地电场异常信号。对于远震,震级和最大异常幅度与震中距乘积的对数存在着线性关系;在震前异常电信号出现的时间段内,异常地电场极化矢量方向基本上呈现出偏离正常线性极化方向。由于拉萨台的周边没有较大的工业设施,观测环境良好,因此这些异常信号的可信度比较高。本文通过总结,为识别地震电信号提供了很有意义的震例。
In 2008,four MS6.0 earthquakes occurred in Tibet,i.e.the Jan.9 Gaize MS6.9,the Aug.25 Zhongba MS6.8,the Sep.Zhongba county MS6.0 and the Oct.6 Dangxiong MS6.6 earthquakes.By examing and analysing data from Lhasa station,we found that there are obvious abnormal geoelectric signals before these four moderate-strong earthquakes.For far earthquakes,the earthquake magnitude is linearly related to the logorithm of the product of abnormaly and epicentral distance,and in the time period of anomaly before earthquakes,the polarized vectors deviate from the normal directions.It was found that these anormalou signals have a high degree of reliability because the Lhasa sation has a better observing environment without large industrial installation nearby.
In 2008,four MS6.0 earthquakes occurred in Tibet,i.e.the Jan.9 Gaize MS6.9,the Aug.25 Zhongba MS6.8,the Sep.Zhongba county MS6.0 and the Oct.6 Dangxiong MS6.6 earthquakes.By examing and analysing data from Lhasa station,we found that there are obvious abnormal geoelectric signals before these four moderate-strong earthquakes.For far earthquakes,the earthquake magnitude is linearly related to the logorithm of the product of abnormaly and epicentral distance,and in the time period of anomaly before earthquakes,the polarized vectors deviate from the normal directions.It was found that these anormalou signals have a high degree of reliability because the Lhasa sation has a better observing environment without large industrial installation nearby.
引文
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[15]马钦忠.文安MS5.1地震前首都圈地电场异常研究[J].地震学报,2008,30(6):615-625.
[16]马钦忠,赵卫国,张文平.文县地电场异常变化及其在2001年昆仑山口西MS8.1地震预测研究中的应用[J].地震学报,2009,31(6):660-670.
[17]马瑾,赵国光,张肇诚,等.构造运动异常与地震前兆的鉴别和场源关系的研究[A].国家地震局科技监测司主编.大陆地震预报的方法和理论[C].北京:地震出版社,1998.331-332.
[18]Varotsos P.The Physics of Seismic Electric Signals[M].TerraPub,Tokyo 338 page,2005.
[19]毛桐恩,席继楼,王燕琼,等.地震过程中的大地电场变化特征[J].地球物理学报,1999,42(4):519-528.
[2]赵玉林,李正南,钱复业,等.地电前兆从中期向短临过渡的综合判据[J].地震,1995,15(4):13-24.
[3]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前兆[A].石特临.地震地电学发展与展望[C].兰州:兰州大学出版社,1998,151-155.
[4]Varotsos P,Alexopoulos K.Physical properties of the variations of the electric field of the earthpreceding earthquakes[J].I Tectophysics,1984,110:73-98.
[5]Varotsos P,Alexopoulos K.Physical properties of the electric field of the earth preceding earth-quakes[J].II Determination of epicenter and magnitude.Tectonophysics,1984,110:99-125.
[6]Varotsos P,Lazaridou M.Latest aspects of earthquake prediction in Greece based on seismic electricsignals[J].Tectonophysics,1991,188:321-347.
[7]Varotsos P,Lazaridou M.Latest aspects of earthquake prediction in Greece based on seismic electricsignals[J].II Tectonophysics,1993,224:1-37.
[8]James Lighthill.A Critical Review of VAN Earthquake Prediction From Seismic Electrical Signal[M].Editor Sir James Lighthill,published by world Scientific publishing Co Pte Ltd University Col-lege London,World Scientific,Singapore,1996.
[9]Corwin R F,Morrison H F.Self-potential variations preceding earthquakes in central California[J].Geophys Res Lett,1995,4:171-174.
[10]Nagao T,Uyeda,Asai Y,et al.Anomalous changes in geoelectric potential preceding four earth-quakes in Japan[M].In:A Critical Review of VAN Earthquake Prediction From Seismic ElectricalSignal.Editor Sir James Lighthill,published by world Scientific publishing Co Pte Ltd UniversityCollege London,World Scientific,Singapore,1996,292-300.
[11]Uyeda S,Nagao T,Orihara Y,et al.I.:Geoelectric potential changes:Possible precursors toearthquakesin Japan[J].Proc Nat Acad Sci,2000,97:4 561-4 566.
[12]Uyeda S,Nagao T,Hattori K,et al.Geophysical observatory in Kamchatka region for monitoringof phenomena connected with seismic activity[J].Nat Hazards and Earth Sc Sciences,2001,1:3-7.
[13]钱复业,赵玉林.地电场短临预报方法研究[J].地震,2005,25(2):33-40.
[14]马钦忠,冯志生,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):11-27.
[15]马钦忠.文安MS5.1地震前首都圈地电场异常研究[J].地震学报,2008,30(6):615-625.
[16]马钦忠,赵卫国,张文平.文县地电场异常变化及其在2001年昆仑山口西MS8.1地震预测研究中的应用[J].地震学报,2009,31(6):660-670.
[17]马瑾,赵国光,张肇诚,等.构造运动异常与地震前兆的鉴别和场源关系的研究[A].国家地震局科技监测司主编.大陆地震预报的方法和理论[C].北京:地震出版社,1998.331-332.
[18]Varotsos P.The Physics of Seismic Electric Signals[M].TerraPub,Tokyo 338 page,2005.
[19]毛桐恩,席继楼,王燕琼,等.地震过程中的大地电场变化特征[J].地球物理学报,1999,42(4):519-528.
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