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1、5.12WenchuanearthquakeSeismicparametersTime:at14:28onMay12,200804.0secondsLatitude:31.0°NLongitude:103.4°EDepth:33kmRichter:Richter8.0Thegreatestintensity:11degreesEpicenter:YingxiuwantownofWenchuanCounty,SichuanDujiangyancity,21km(267°)northwestworshipCity48km(327°)DayiCounty,nor
2、thwest48km(346°)northwestofChengdu75km(302°)Historicalbackground:WenchuanearthquakeinChinasincethefoundingofChina'smostsinceastrongearthquake,thedirectandseriousdisaster-strickenareasof100,000squarekilometersEarthquakecauses:CASresearcherattheInstituteofGeologyandGeophysics,theQin
3、ghai-TibetPlateauResearchWangWenchuan27pairsmorefamiliarwithregionalgeologicalstructure,inearlyMayhasbeenWenchuanarea.HeanalyzedthatWenchuanearthquakeoccurredinthesoutheastedgeoftheQinghai-TibetPlateau,westernSichuanLongmenshanthecenter,locatedinWenchuan-Timor-maoonthefaultzone.In
4、dianOceanplatenorthwardmovement,squeezingtheEurasianplate,causingupliftoftheQinghai-TibetPlateau.Atthesametimeintheupliftoftheplateau,alsoeastwardmovement,squeezingtheSichuanBasin.SichuanBasinisarelativelystableblock.AlthoughthemainlooksLongmenshantectonicactivityisnotstrong,butth
5、estressmaybestoredintheprocessofaccumulationtoacertainextent,thecrustwillbreakdown,sotheearthquake.TheU.S.GeologicalSurveyalsoreleasedthenewsthattheearthquake'sepicenterandfocalmechanismsandLongmenshanfaultorarelatedmovementoftectonicfaultinline,theearthquakeisathrusttothenortheas
6、tofthecampaignresults.Fromthemainlandscale,CentralAsiaandEastAsia,theseismicactivityisduetotheIndianOceanplatecollisionoftheEurasianPlate.SouthernCaliforniaEarthquakeResearchCenter,ProfessorLiYonggangtoldXinhua,Longmenshanfaultzoneisearthquake-proneregionofactivefaults,fromtheQing
7、hai-TibetPlateaudeepeastwardflowofmaterialdisruptiontotheSichuanBasin,theupwardmovement,whichbothborderForthefaultplane.Ifthefaultmovementafewcentimetersayear,onceevery50to70meters,theaccumulationofstressandenergycanbegeneratedfromamagnitude7earthquakeabove.Asthesourceshallow,andf
8、ocalmechanismfortheeastwardthrust
