简介:Accordingtothemethodforpredictingstrongearthquakesusingseismicitypatterns,thispapersummarizestheseismicityanomalies,generallycalledanomalousseismicitypatterns,asthebasisforpredictionbasedonsomehistoricaldataintheSichuan-Yunnanseismiczone.Usingourresults,itcanbeconfirmedthattheseanomalypatterns,whichreflectthefeaturesofthelatestageofstrongearthquakepreparationprocessandstressreleaseinthemainshockrupturezone,didexistbeforemanyearthquakecases.Thispaperalsointroducedthecharacteristicsofseismicrepeatabilityanditsvalidationresult,anddiscussedthemechanismofrepeatability,whichwillhaveanapplicationvalueforstrongearthquaketendencyprediction.
简介:Inthispaper,thelongtimeseriesdataofthewellwater-leveldataof12wellsintheSichuanandYunnanareaisanalyzedbytheBaytap-Gtidalanalysissoftware,andwellwaterleveltidalresponsecharacteristicparameters(amplituderatioandphasechange)areextracted.Weanalyzedthefeaturesoftheshapeandstagechange,andcharacteristicparametersofthetidalresponseofwellwaterlevelbeforeandaftertheearthquakes,whichcanprovideanewmethodandapproachtoanalyzingtheresponserelationshipsbetweenwellwaterlevelandearthtideandbarometricpressure.TheresultsshowthatLuguhuWelland9otherwellsareaffectedbyearthtides,andtheirwellwaterlevelamplituderatiosandphasesarerelativelystable;theNanxiWellandDayaoWellwaterlevelchangesareaffectedbythebarometricpressurecombinedwithtideforce,andtheirwellwaterlevelamplituderatiosandphasesaremorediscrete.ThewaterlevelamplituderatiosandphasesofJiangyouWell,LuguhuWellandDongchuanWellaresignificanttolargeearthquakes,andtherelationshipbetweenseismicenergydensityandwaterlevelamplituderatiosandphasesofM_2waveofthethreewellsarepresented.
简介:Threemethodsofextractingtheinformationofanomaliesofaprecursorygroupareputforward,i.e.,themathematicalanalysesofthesyntheticinformationofearthquakeprecursors(S),theinhomogeneousdegreeofprecursorygroups(ID)andthevaluesofshort-termandimpendinganomalyinnear-sourcearea(NS).Usingthesemethods,wecalculatetheobservationaldataofdeformation,undergroundfluidandhydrochemicalconstituentsobtainedfromdifferentseismicstationsintheSichuan-YunnanregionandconcludethatthesyntheticprecursoryanomaliesofasinglestrongearthquakewithMs6.0differgreatlyfromthoseofthegroupedstrongearthquakes,fortheanomalousinformationofprecursorygroupsaremoreabundant.ThethreemethodsofextractingthesyntheticprecursoryanomalyandtherelatednumericalresultscanbeappliedintothepracticeofpredictiontothegroupedstrongearthquakesintheSichuan-Yunnanregion.Inhomogeneousdegree(ID)ofsyntheticprecursoryanomalycanbeidentifiedautomaticallybecauseittakesthethresholdofdistributivecharacteristicsoftheanomaliesofprecursorygroupasitscriterionforanomaly.
简介:TheWenchuanearthquakecoseismicdeformationfieldisinferredfromthecoseismicdislocationdatabasedona3-DgeometricmodeloftheactivefaultsinSichuan-Yunnanregion.Thenthepotentialdislocationdisplacementisinvertedfromthedeformationfieldinthe3-Dgeometricmodel.Whilethefaults'slipvelocitiesareinvertedfromGPSandlevelingdata,whichcanbeusedasthelong-termslipvector.Afterthepotentialdislocationdisplacementsareprojectedtolong-termslipdirection,wehavegottheinfluenceofWenchuanearthquakeonactivefaultsinSichuan-Yunnanregion.TheresultsshowthatthenorthwesternsegmentofLongmenshanfault,thesouthernsegmentsofXianshuihefault,Anninghefault,Zemuhefault,northernandsouthernsegmentsofDaliangshanfault,Mabianfaultgotearthquakerisksadvancedof305,19,12,9.1and18,51yearsrespectivelyintheeasternpartofSichuanandYunnan.TheLijiang-Xiaojinhefault,Nujiangfault,Longling-Lancangfault,NantinghefaultandZhongdianfaultalsogotearthquakerisksadvancedinthewesternpartofSichuan-Yunnanregion.WhereasthenorthwesternsegmentofXianshuihefaultandXiaojiangfaultgotearthquakerisksreducedaftertheWenchuanearthquake.
简介:CombiningthedenseGPSandgravityobservationdatainSichuan-Yunnanarea,wheretherearetherelativelycompleteactivetectoniczonesandseismicdata,thispaperappliesthegeodesyandgeophysicalinversiontechniqueandtheadvancednumericalsimulationtothesynthesisstudyofgeodesyinversiontofindthedynamicprocessoftectonicmovementanddeformationintheareaandfinallytoinvestigatethekinematicscharacteristicofthegeologicalstructureofdifferentlayeranddifferentscale.Thispaperdiscussesthekinematics,dynamicsmodelaboutthecrustalmovementofactiveblocksinSichuan-Yunnanareaanditsadjacentareas.
简介:Weanalyzed360permanentandcampaignGPSdatafrom1999to2017inthesouthernSichuan-Yunanblock,andobtainedcrustalhorizontaldeformationinthisregion.Then,wederivedthestrainrateusingamulti-scalesphericalwaveletmethod.ResultsrevealacomplexpatternoftectonicmovementinthesouthernSichuan-Yunnanblock.ComparedtothestableEurasianplate,themaximumrateofthehorizontaldeformationinthesouthernSichuan-Yunnanblockisapproximately22mm/a.TheXiaojiangfaultshowsasignificantlylowerdeformation—aleft-lateralstrike-slipmovementof9.5mm/a.TheHonghefaultclearlyshowsacomplexsegmentaldeformationfromthenorthtosouth.ThenorthernHonghefaultshows4.3mm/arightstrike-slipwith6.7mm/aextension;thesouthernHonghefaultshows1.9mm/arightstrike-slipwith1.9mm/aextension;thejunctionzoneintheHongheandLijiang–Xiaojinhefaultsshowsanobviousclockwise-rotationdeformation.Thestraincalculationresultsrevealthatthemaximumshear-strainrateinthisregionreaches70nstrain/a,concentratedaroundtheXiaojiangfaultandatthejunctionoftheHongheandLijiang–Xiaojinhefaults.Wenotethatmostoftheearthquakeswithmagnitudesof4andabovethatoccurredinthisregionwerewithinthehighshearstrain-ratezonesandthestrainrategradientboundaryzone,whichindicatesthatthemagnitudeofstrainaccumulationiscloselyrelatedtotheseismicactivities.Comparisonofthefastshear-wavepolarizationdirectionoftheupper-crustwiththeupper-mantleanisotropyandthedirectionofthesurfaceprincipalcompressivestrainrateobtainedfromtheinversionoftheGPSdatarevealsthatthedirectionofthesurfaceprincipalcompressivestrainisbasicallyconsistentwiththefastshear-wavepolarizationdirectionoftheuppercrustanisotropy,butdifferentfromthepolarizationdirectionoftheuppermantle.OurresultssupportthehypothesisthattheprincipalelementsofthedeformationmechanisminthesouthernSichuan-Yunnanblockaredeco
简介:BasedonthefirstarrivalPandSdataof4625regionalearthquakesrecordedat174stationsdispersedintheYunnanandSichuanProvinces,the3-Dvelocitystructureofcrustanduppermantleintheregionisdetermined,incorporatingwithpreviousdeepgeophysicaldata.Intheuppercrust,apositiveanomalyvelocityzoneexistsintheSichuanbasin,whereasanegativeanomalyvelocityzoneexistsinthewesternSichuanplateau.TheboundarybetweenthepositiveandnegativeanomalyzonesistheLongmenshanfaultzone.TheimagesoflowercrustanduppermantleintheLongmenshanfault,Xianshuihefault,Honghefaultandothersshowthecharacteristicoftectonicboundary,indicatingthatthefaultslikelypenetratetheMohodiscontinuity.Thenegativevelocityanomaliesatthedepthof50kmintheTengchongvolcanicareaandthePanxitectoniczoneappeartobeassociatedwiththetemperatureandcompositionvariationsintheuppermantle.TheoverallfeaturesofthecrustalandtheuppermantlestructuresintheSichuan-Yunnanregionaretheloweraveragevelocityinbothcrustanduppermostmantle,thelargecrustalthicknessvariations,andtheexistenceofhighconductivitylayerinthecrustor/anduppermantle,andhighergeothermalvalue.AllthesefeaturesarecloselyrelatedtothecollisionbetweentheIndiaandtheAsiaplates.ThecrustalvelocityintheSichuan-Yunnanrhombicblockgenerallyshowsnormalvalueorpositiveanomaly,whilethenegativeanomalyexistsintheareaalongthelargestrike-slipfaultsastheblockboundary.Itisconducivetothecrustalblockside-pressingoutalongthefaults.Inthemajorseismiczones,theseismicityisrelativetothenegativeanomalyvelocity.Moststrongearthquakesoccurredintheupper-midcrustwithpositiveanomalyornormalvelocity,wherethenegativeanomalyzonegenerallyexistsbelow.
简介:Analysisofdeformationdatameasuredacrossthefaults,regionalverticaldeformationdataandGPSmeasurementsintheSichuan-Yunnanregionmadesincethe1980spermittedustoconcludethatthecrustaldeformationintheregionduringthisperiodoftimewasrelativelyweakandcausedtheoccurrenceofearthquakes(Ms≥6.0),whichwerenotdistributedalongthemajorboundaryactivefaultsintheregionafterthe1981DawuMs6.9earthquakeandthattheseismicactivityischaracterizedbyquasi-clockwisemigration.Thus,itfollowsthatearthquakepredictionresearchshouldbefocusedonthecentralpartoftheSichuan-Yunnanregioninthecomingyears.Finally,aconceptoftemporaldivisionoftheregionintoactiveblocksissuggestedandthepreliminaryresultofthedivisionisgiveninthepaper.
简介:在结晶化以后沿着Yangtzecraton和他们的变形历史的西方边缘澄清变形侵入的关系,石油化学并且踪迹元素geochemical人物,标明日期的锆石虾U-Pb,和化学药品从在Kangding的Neoproterozoic变形侵入的共存的角闪石和斜长石的作文(),四川()省,和Yuanmou(),云南()省,被学习。与以前的出版数据结合了,在Yangtzecraton的西方边缘的Kangding花岗石的plutons和Yuanmou建筑群通常在一样的句号形成了,这被显示。在700妈的变形事件广泛地存在,至少在四川从Kangding区域盖住到Eshan()在中央云南的区域。而且,角闪岩外形可以代表山峰地区性的变形状况。
简介:<正>Itwasasimplechoice:Mt.EmeiandLeshanGrandBuddha:RouteB,VIPticket,abustourtotwoofChina’sWorldNaturalHeritageSites,describedinafewbriefwordsinabrochureandoftenover-lookedbyvacationersonarushthroughChengdutoTibet,Yunnanorthe3Gorges.Thetourisescortedbyawell-informedChinesespeakingguide,whoislikeawind-updoll:oncestartedisguar-anteedtotalknon-stopforatleast30minutes.Languagecouldbeaproblem,butchancesaresomeoneonboardisbi-lingual,soit’spossibletosneakawayto
简介:IntegratedApproachinSichuanTheIntegratedApproachtofamilyplanning,oneoftheinitiativestakenbythepublicandgrassrootsfamilyplanni...
简介:ThepeopleofallethnicgroupsofYunnanprovince,whoareJivingamongbigmountains,ornamentthemselveswithjewelsofvariedtexturesandstyles,whichembodytheingenuity,diligenceandsuperbcraftsmanshipoftheethnicgroupsofYunnanprovince.Theysparenoeffortstodressthemselvesupfromheadtotoe,nreatingrichandcolourfulbodyornamentsintheprocess.Theseornaments,regardlessofsizeorprice,arethemostattractireandcharacteristicamongthegarmentsandaccessoriesoftheethnicgroupsofYunnan.
简介:SichuanUniversityofScienceandEngineering(SUSE)islocatedinZigong,Sichuan.Thecityisknownasthe'SaltCapital',the'HometownoftheDinosaur',andthe'LanternCity'.SUSEwasoriginallynamedEastChinaUniversityofChemicalTechnology(Southwest