简介:在2010Yushu地震以后的二个小时,摇晃的紧张分发用基于地点效果的ShakeMap快速的产生系统被获得,由作者发展了,它集成原因的差错的构造设置,罢工和规模的信息,在西方的中国的焦点的机制solutions.fault破裂进程和变细关系,以及本地地点effects.The结果如下:摇紧张分发的主要的轴被指导NW-SE,平行到Yushu差错;meizoseismal区域到达紧张并且盖住300km2;紧张区域主要沿着原因的差错在区域40km东南和震中的15km西北被散布;由于本地土壤条件,有基岩上的紧张的区域的西北的部分看紧张是否从基岩变换成土壤;有紧张的区域,,分别地测量3,000km2,8,000km2,和24,000km2。
简介:Morethanahalfofstrongearthquakesintheworldarelocatedinshallowdepthatthesubductingplateboundaryinsqueezedzones.Owingtothedifferenceinspeedbetweenthemovingseaplates,thestrainenergyisaccumulatedandreleasedcyclicallyinsqueezedzones.Severalmethodsweredevelopedtoanalyzethemedium-andshort-termpotentialofmainshocks.Thesemethodscanbeclassifiedinto(1)lessdatasystemsusingthetheoryofgreymodelforearthquakeprediction,(2)quasi-periodicsystemsusingearthquakeactivityanalysis,(3)systemsofgroupedactivityusingorderanalysis,and(4)nonlinearsystemsusingbackpropagation(BP)ofneuralnetworkforpredictionanalysis.Basedupontheseanalyticmethods,riskmapsforthepredictionofstrongearthquakescanbedrawnusingtherecordsofstrongearthquakesinTaiwanforthepast100years.Theseriskmapsinclude(1)aseismicriskmap,(2)alossriskmap,(3)ahazarddegreemap,and(4)alossdegreemap.Theseriskmapsmakeitpossibletodoamedium-termpredictionofmainshocksonthe10-yearscale.
简介:OnApril14,2010at07:49(Beijingtime),acatastrophicearthquakewithMS7.1occurredatthecentralQinghai-TibetanPlateau.TheepicenterwaslocatedatYushucounty,QinghaiProvince,China.Atotalof2036landslidesweredeterminedfromvisualinterpretationofaerialphotographsandhighresolutionremotesensingimages,andverifiedbyselectedfieldinvestigations.Theselandslidescoveredatotalareaofabout1.194km2.Characteristicsandfailuremechanismsoftheselandslidesarelistedinthispaper,includingthefactthatthespatialdistributionoftheselandslidesiscontrolledbyco-seismicmainsurfacefaultruptures.Mostofthelandslidesweresmallscale,causingratherlesshazards,andoftenoccurringclosetoeachother.Thelandslideswereofvarioustypes,includingmainlydisruptedlandslidesandrockfallsinshallowsandalsodeep-seatedlandslides,liquefactioninducedlandslides,andcompoundlandslides.Inadditiontostronggroundshaking,whichisthedirectlandslidetriggeringfactor,geological,topographical,andhumanactivityalsohaveimpactontheoccurrenceofearthquaketriggeredlandslides.Inthispaper,fivetypesoffailuremechanismsrelatedtothelandslidesarepresented,namely,theexcavatedtoesofslopesaccompaniedbystronggroundshaking;surfacewaterinfiltrationaccompaniedbystronggroundshaking;co-seismicfaultslippingaccompaniedbystronggroundshaking;onlystronggroundshaking;anddelayedoccurrenceoflandslidesduetosnowmeltorrainfallinfiltrationatsiteswhereslopeswereweakenedbyco-seismicgroundshaking.Besidesthemainco-seismicsurfaceruptures,slopefissureswerealsodelineatedfromvisualinterpretationofaerialphotographsinhighresolution.Atotalof4814slopefissures,withatotallengthupto77.1km,werefinallymapped.Theseslopefissuresaremainlydistributedontheslopeslocatedatthesoutheasternendofthemainco-seismicsurfacerupturezone,anareasubjecttostrongcompressionduringtheeart
简介:AnearthquakewithM7.1occurredinYushu,QinghaiProvince,China,at07:49a.m.onApril14,2010,accordingtotheChineseSeismicStationNetwork.Thesequenceisafore-mainafter-shocktypesequence.AforeshockwithM4.7occurred2hoursand11minutesbeforethemainshock.Therewere12foreshocksand2385aftershocksuntilJune31,2010.Inwhich,thereare21aftershocksbetweenM3.0andM3.
简介:Theauthorsstudiedtheseismicactivity,precursoryanomaliesandabnormalanimalbehaviorbeforetheApril14,2010MS7.1Yushuearthquake.AnalysisshowedthatanomalieswerenotrichbeforetheMS7.1Yushuearthquake,butprominentanomalieswereobserved,suchasthelongandmid-termtrendanomalycharacterizedbytheseismicquiescenceofMS6.0,MS5.0andMS4.0earthquakes,andtheanomaliesinprecursorobservationofsurfacewatertemperatureinYushuandDelinghaandelectromagneticmeasurementinPingan.Therewerealargenumberofanimalbehavioranomaliesappearingoneweekbeforetheearthquake.AnM4.7earthquakeoccurred130minutesbeforethemainshock.Inthispaper,westudiedthedynamicprocessoftheYushuearthquakepreparationusingtheearthquakefocalmechanismsolutionsontheBayanHarblockboundarysince1996.TheresultsshowthattheKalakunlunM7.1earthquakein1996,theManiM7.5earthquakeandtheYushuMS7.1earthquakehavethesamedynamicprocess.Longandmid-termtrendanomaliesmayberelatedtothedynamicsofevolutionofdifferentearthquakes.Thispaperalsodiscussestherecurrenceintervalofstrongearthquakes,foreshockidentificationandprecursorobservationoftheYushuMS7.1earthquake.
简介:Basedondatacollectedfromatemporalseismicnetwork,andinadditiontothedatafromsomenearbypermanentstations,weinvestigatethevelocitystructureandseismicityintheRongchanggasfield,wheresignificantinjection-inducedseismicityhasbeenidentified.First,weusereceiverfunctionsfromdistantearthquakestoinvertdetailed1-Dvelocitystructuresbeneathtypicalstations.Then,weusethedouble-differencehypocenterlocationmethodtore-locateearthquakesofthe2010ML5.1earthquakesequencethatoccurredintheregion.There-locatedhypocentersshowthatthe2010ML5.1earthquakesequencewasdistributedinasmallareasurroundingmajorinjectionwellsandclusteredmostlyalongpre-existingfaults.Majorearthquakesshowafocaldepthlessthan5kmwithadominantdepthof~2km,adepthofmajorreservoirsandinjectionwells.Wethusconcludethatthe2010ML5.1earthquakesequencemighthavebeeninducedbythedeepwellinjectionofunwantedwateratadepth~3kmintheRongchanggasfield.
简介:The2010YushuMS7.1earthquakeoccurredinGanzi-Yushufault,whichisthesouthboundaryofBayanHarblock.Inthisstudy,byusingdoubledifferencealgorithm,thelocationsofmainshock(33.13°N,96.59°E,focaldepth10.22km)andmorethan600aftershockswereobtained.ThefocalmechanismsofthemainshockandsomeaftershockswithMS>3.5wereestimatedbyjointlyusingbroadbandvelocitywaveformsfromGlobalSeismicNetwork(GSN)andQinghaiSeismicNetworkaswell.Thefocalmechanismsandrelocationshowthatthestrikeofthefaultplaneisabout125°(WNW-ESE),andthemainshockisleft-laterallystrike-slip.Theparametersofshear-wavesplittingwereobtainedatseismicstationsofYUSandL6304bysystematicanalysismethodofshear-wavesplitting(SAM)method.Basedontheparametersofshear-wavesplittingandfocalmechanism,thecharacteristicsofstressfieldinseismicsourcezonewereanalyzed.ThedirectionsofpolarizationatstationsYUSandL6304aredifferent.ItisconcludedthatafterthemainshockandtheMS6.3aftershockonApril14,thestress-fieldwaschanged.