利用地基GPS探测震前电离层TEC异常
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摘要
利用地基GPS测量获得垂直电子总含量(VTEC)数据,采用统计分析方法,对亚洲3次大地震震前VTEC进行了检查。结果发现,在临震前10天之内,孕震区上空的VTEC均出现了明显的异常扰动,异常的增加一般出现在异常减少之前,但距发震时刻较远,该异常可能与太阳或地磁活动增强有关;异常的减少一般临近发震时刻,基本可以归结为地震引起的电离层效应。
Utilizing the VTEC data obtained by ground-based GPS and adopting statistical analysis method, we examined the VTEC before three strong earthquakes in Asia. As a result, we found the anomalous VTEC disturbances over seismic preparation zone, which took place ten days before the events:at the begining,the VTEC was increesing and then decreasing.We suggest that the increase which occured in the time far from the moment when the earthquake burst out may be related to the enhencement of Solar or geo-magnetic activity and the decrease which were close to the earthquake moment,so it can basically ,be thought as the ionosphre effect caused by quake.
Utilizing the VTEC data obtained by ground-based GPS and adopting statistical analysis method, we examined the VTEC before three strong earthquakes in Asia. As a result, we found the anomalous VTEC disturbances over seismic preparation zone, which took place ten days before the events:at the begining,the VTEC was increesing and then decreasing.We suggest that the increase which occured in the time far from the moment when the earthquake burst out may be related to the enhencement of Solar or geo-magnetic activity and the decrease which were close to the earthquake moment,so it can basically ,be thought as the ionosphre effect caused by quake.
引文
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2PlotkinVV.GPSdetectionofionosphericperturbation beforethe13February2001,ElSalvadorearthquake[J].NaturalHazardsandEarthSystemSciences,2003,3:249-253.
3LiuJY,ChuoYJ,ShanSJ,etal.Pre earthquakeion osphericanomaliesregisteredbyGPSTECmeasurement[J].AnnalesGeophysicae,2004,22:1585-1593.
4TrigunaitA,ParrotM,PulinetsSA,etal.Variationof ionosphericelectrondensityduringtheBhujseismicevent[J].AnnalesGeophysicae,2004,22:4123-4131.
5PulinetsSA,BoyarchukKA,LomonosovAM,etal.Ionosphericprecursorstoearthquakes:apreliminarya nalysisofthefoF2criticalfrequenciesatChung Li ground basedstationforverticalsoundingionosphere(Taiwanisland)[J].GeomagnetismandAeronomy,2002,42(4):508-513.
6PulinetsSA,LiuJYandSafronovaIA.Interpretation ofastatisticalanalysisofvariationsinthefoF2critical frequencybeforeearthquakesbasedondatafromChung Liionosphericstation(Taiwan)[J].Geomagnetismand Aeronomy,2004,44(1):102-106.
7乔学军,杜瑞林,王琪,等.2003年10月29～31日太阳耀斑对中国大陆电离层扰动的GPS监测与分析[J].大地测量与地球动力学,2005,25(2):41～45.7QiaoXuejun,DuRuilin,WangQi,etal.Monitorsolar flareduringoctober29-31,2003andanalysisofitsdisturbancestotheionosphereoverChinabyGPSmeasure ments[J].JournalofGeodesyandGeodynamics,2005,25(2):41-45.(inChinese)
8PulinetsSA.Seismicactivityasasourceoftheiono sphericvariability[J].Adv.SpaceResearch,1998,22(6):903-906.
9PulinetsSA,Legen’kaAD,GaivoronskayaTV,etal.Mainphenomenologicalfeaturesofionosphericprecur sorsofstrongearthquakes[J].JournalofAtmospheric andsolar terrestrialPhysics,2003,65:1337-1347.
10ParrotM.Seismo electronmagneticeffectsintheiono sphere[J].GeophysicalResearchAbstracts,2003,5:01038.
11谭凯,王琪,申重阳.用大地测量数据反演2001年昆仑山地震[J].大地测量与地球动力学,2004,24(3):47～50.11Tankai,WangQiandShenChongyang.Usinggeodetic datatoinverseco seismicdislocationof2001Kunlun earthquake[J].JournalofGeodesyandGeodynamics,2004,24(3):47-50.(inChinese)
12PulinetsSA,BoyarchukKA,HegaiVV,etal.Quasielectrostaticmodelofatmosphere thermophere i onospherecoupling[J].Adv.SpaceResearch,2000,26(8):1209-1218.
13EftaxiasK,KapirisP,PolygiannakisJ,etal.Experi enceofshorttermearthquakeprecursorswithVLF VHFelectronmagneticemissions[J].NaturalHazards andEarthSystemSciences,2003,3:217-228.
14AfraimovichEL,PerevalovaNP,PlotnikovAVetal.Theshock acousticwavesgeneratedbyearthquake[J].AnnalesGeophysicae,2001,19:395-409.
15AfraimovichEL,KosogorovEA,PlotnikovAV.Shock acousticwavesgeneratedduringrocketlaunches andearthquakes[J].CosmicResearch,2002,40(3):241-254.
16GotynyanOE,IvchenkoVN,RapoportYuG,etal.EffectoftheAGWofthelithosphericoriginintheiono sphericFregionbeforeearthquake[J].GeophysicalRe searchAbstracts,2003,5:02495.
17RapopartVO,BespalovPA,MityakovNA,etal.Numericalstudyofacoustic gravitywavespropogation fromdifferentground basedsourcestoionospherealti tudes[J].GeophysicalResearchAbstracts,2003,5:03107.
18PulinetsSA.Ionosphericprecursorsofearthquakes;recentadvancesintheoryandpracticalapplications[J].TAO,2004,15(3):413-415.
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