简介:TheelectrondensityrecordedonboardtheDEMETERsatellitewasanalyzedtosearchforpossibleanomaliesbeforeearthquakesbothinspaceandtime.Todistinguishpre-earthquakeanomaliesfromtheotheranomaliesrelatedtogeomagneticactivity,datawerefilteredusingtheK_pindex.Theanalysisisbasedonthecomparisonofdatarecordedcloselytoearthquakesinspaceandtimeandpastdataforthesamearea.InanalyzingdataaroundthetimeandlocationofthePu'erandWenchuanearthquakes,obviousanomaliesinelectrondensitywerefoundclosetotheepicenters,andsomeremarkabledisturbancesweredetectedbeforetheearthquakesoccurred.Theresultswerefinallycomparedwiththoseofpreviousworksthatusedthesamedatabutemployeddifferentanalysismethods.Goodagreementwasfoundwhichsuggeststhattheseanomalieshaveacloserelationtotheearthquakepreparation.
简介:ThedataofionosphericperturbationsobservedonDEMETERbeforethe2007Pu'erearthquakeareanalyzed.Thethree-componentplasma(ions,electronsandheavyions)isstudiedinthefluidconcept.Thelineardispersionrelationforion-acousticwaveisfoundinthepresenceofheavyions.Thenonlineardynamicsisstudiedforarbitraryamplitudeofthewave.TheSagdeevpotentialiscalculated,whichshowsthatsolitarystructureexistsforMachnumberwithinarangedefinedbythepresenceofheavyions.Thedevelopedion-acousticsolitonsmaybeusedasprecursorforearthquakeprediction.
简介:针对震后大面积废墟下被困人员快速准确检测与定位的需求,本文提出了基于wi-Fj信号的地震灾害人员侦查技术。以嵌入式技术为基础,涉及FSK通信、wi-Fi定位、wi-Fi定位算法等方面的研究,提出wi—Fi热点中继设备和显控中心平台切实可行的设计解决方案,研制出能够实现震后大面积废墟下被困人员快速定位的设备,并提出设备布设方案。为我国地震救援提供一种有效的技术手段。