简介：ＦｒａｃｔａｌａｎｄｃｈａｏｔｉｃｐｈｅｎｏｍｅｎａｏｆｓｅｉｓｍｉｃｄｉｓｓｉｐａｔｅｄｅｎｅｒｇｙｉｎａｎｅｎｅｒｇｙｓｙｓｔｅｍｏｆｅｎｇｉｎｅｅｒｉｎｇｓｔｒｕｃｔｕｒｅｓＹＵ－ＨＯＮＧＣＵＩ１）（崔玉红）ＹＯＮＧ－ＡＮＮＩＥ２）（聂永安）Ｚ...

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简介：Ｒｅｓｅａｒｃｈｏｎｐｒｏｂａｂｉｌｉｔｙｏｆｓｅｉｓｍｉｃｃｒｉｔｉｃａｌｉｎｓｔａｂｉｌｉｔｙｏｎｂａｓｉｓｏｆ＇＇ｆｒａｃｔｕｒｅｃｏｌｌｕｓｉｏｎ＇＇ｍｏｄｅｌＳＨＩ－ＹＯＮＧＺＨＯＵ１）（周仕勇），ＬＩＮＧ－ＲＥＮＺＨＵ１）（朱令人），ＭＡ...

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简介：TheMayangCudeposit,westernHunanisamiddle-scalesandstone-typeCudepositpredominantofnativecopper.Fromanangleofgeologicalintegrativefield,fracturegeochemicalfeaturesarestudidedanddiscussedinthispaper.Infracturestructure,variantregularityandtheratiosofelementcouplesparticipatinginmetallogensisthattheirgeochemicalnaturesaresimilarorstronglycorrelative,revealchanginglawsofmetallogenictemperatureandpressurefieldsandmigratingdirectionofmetallogenicelements.Thetheoreticalstudytalliesmuchbetterwithproductivepractice.Theyaremeaningfultoconductprospectingandexployation.

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简介：Byusinganine-levelatmosphericgeneralcirculationmodeldevelopedattheInstituteofAtmosphericPhysics(IAP9LAGCM),twosetsofnumericalexperimentsarecarriedouttoinvestigatetheinfluenceoftheMascarenehigh(MH)andAustralianhigh(AH)overthesouthernsubtropicsupontheEastAsiansummermonsooncirculationandsummerprecipitationinEastAsia.Theuseofensemblestatisticsisadoptedtoreducethesimulationerrors.TheresultshowsthatwiththeintensificationofMH,theSomalilow-leveljetissignificantlyenhancedtogetherwiththesummermonsooncirculationinthetropicalAsiaandwesternPacificregion.Furthermore,theanticyclonicanomalyinthetropicalwesternPacifictotheeastofthePhilippinesmayinduceaweakEast-Asia-Pacificteleconnectionpattern.Inthemeantime,geopotentialheightintheTropicsisenhancedwhileitisreducedovermostregionsofmid-highlatitudes,thusthenorthwesternPacificsubtropicalhighat500hPaextendssouthwestward,resultinginmorerainfallinsouthernChinaandlessrainfallinnorthernChina.AsimilaranomalypatternoftheatmosphericcirculationsystemsisfoundintheexperimentoftheintensificationofAH.Ontheotherhand,becausethecross-equatorialcurrentsassociatedwithAHaremuchweakerthantheSomalijet,theanomalymagnitudecausedbytiheintensificationofAHisgenerallyweak,andtheinfluenceofAHonsummerrainfallinChinaseemstobelocalizedinsouthernChina.ComparisonbetweenthetwosetsofexperimentsindicatesthatMHplaysacrucialroleintheinteractionsofgeneralatmosphericcirculationbetweenthetwohemispheres.

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简介：Pierson-MoskowitzSpectrum,JONSWAPSpectrumaswellasBretschneider-MitsuyasuSpectrumareusedinthispaperforanalyzingtheinfluenceofwaveenergydirectionalspreadonrefractionofwavespectrumduetobothcurrentandtopographyofseabed.Theauthor’scalculationindicatesthatsuchkindinfluenceonthecharacteristicvalueofwaveheightaswellastheaveragedirectionofwaveenergypropagationcannotbeignored.

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简介：Inthepasttwentyyears,theproportionofcoalinprimary-energyconsumptioninChinaisgenerallybetween71.3%and76.5%.Theoutputofcoalwas1.374billiontonsin19%,and1.21tonsin1998,whichrankedfirstintheworld.NowcoalisminedmainlywithmechanizationinChina,whichisplannedtoreach80%inmajorState-ownedcoalminesin2000accordingtotheplanningofthegovernment(Lietal.,1998;TangDejin,1998).ComparedwiththeUSAandAustralia,Chinahasmorecomplexcoalgeologicalstructures.Basedonhigh-resolutionseismictechniqueincoalexploration,anewseismictechniquewithhigh-precisionandhigh-resolution(2-Dand3-D)hasbeendevelopedforthepurposeofdetectingsmallgeologicalstructuresincoalmineconstructionandproductiontomeettheneedsoflarge-scalepopularizationofmechanizedcoalmininginChina.Thetechniqueislowincostandrequiresarelativelyshortperiodofexploration,withhighprecisionandwide-rangeapplications.Inthemiddleoft

简介：TheYajiangearthquakesequencein2001,withthemajoreventsofMs5.1onFeb.14andofMs6.0onFeb.23,aresignificanteventsintheSichuanregionduringthelast13years.Eighty-eightearthquakesinthesequencewithatleast5distinctonsetparametersforeachrecordedbytheSichuanSeismicNetworkintheperiodofJan.1throughJune30,2001werechosenforthisstudy.TheeventsarerelocatedandthefocalmechanismisderivedfromP-waveonsetsfor13eventswithrelativelylargermagnitudes.Thefocaldepthofallearthquakesfallbetweenarangeof2kmto16km,withdominantdistributionbetween9kmto11km.Theforeshocks,theMs5.1earthquakeandtheMs6.0earthquakeandtheiraftershocksarealllocatedclosetotheZihefaultandthedominantepicentraldistributionisinNWdirection,identicaltothatofthefault.ThefracturesurfaceofthefocalmechanismisdeterminedinaccordancetothemasstransferorientationintherecentearthdeformationfieldintheYajiangregion.ThePaxesoftheprincipalcompressivestressinfocalmechanismsolutionsofthe13eventsshowbiggerverticalcomponents,andthehorizontalprojectiontrendingSE.Theearthquakesareofleft-lateral,strike-slipnormal,andnormalstrike-sliptypes.TherupturesurfaceofmostearthquakesstrikeNW-SE,dippingSW.Basedontheaboveinformation,weconcludethattheZihefaultthatcrossestheearthquakearea,strikingNWanddippingSW,istheseismogenicfaultfortheYajiangearthquakesequence.

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简介：Foralongtime,aquantitativecalculationofenergyradiatedbyseismicwaveshasbeenanimportantprobleminthebasicstudyofseismology.Uptonowthewell-knownrelationshipoflgE=l.5MS+11.8createdbyGutenbergandRichter(1956)hasstillbeenabetterexperientialstatisticalrelationforestimatingtheenergyofseismicwaves.Sincethecreationofseismicdislocationmodelinthe1960s,seismologistshavestudiedaquantitativecalculationofenergyradiatedbyseismicwaves.Forexample,Haskell(1964),VassilionandKanamori(1982),CHENandDuda(1993b)haveacquiredmanycreativeresults.Especiallysincethe1980s,digitalseismometerswithlargedynamicrange,widebandandhighprecisionusedinseismicmonitoringandusageofprocessingtechnologyofdigitalcomputerhavegreatlyexploitedthestudyfieldofmoderndigitalseismology.OnthebasisofseismicdislocationmodeldevelopedbyBrune(1970),anewseismicwaveradiatedenergyrelationdependedonseismicmoment,ambientstress(0andpeakgroundmovementhasbeenestablished.DataobservedbymobiledigitalseismometerintheYao(anM=6.5earthquakeonJanuary15,2000anditsaftershocksequenceareusedtoestimateseismicradiatedenergy.Furthermore,wealsodiscusstheambientstress(0andcharacteristicsofenergyattenuationfortheaftershocksequence.

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简介：Theharmonicanalysismethodbasedonhighandlowwaterlevelsisdiscussedinthispaper.Inordertomakefulluseoftheinformationofhighandlowwaterobservations(thetimederivativeofwaterlevelattheobservationtimeiszero),theweightcoefficient,w,isintroducedtocontroltheimportanceofthepartrelatedtothisinformationintheerrorformula.Themajordiurnalconstituents,O1andK1,andsemi-diurnalconstituents,N2,M2andS2areselecteddirectlyfromthemonthlydataanalysis,andsomeotherimportantconstituents,P1,v2andK2,areincludedastheinferredconstituents.Theobtainedharmonicconstantsofthemajorconstituentsareveryclosetothoseobtainedfromtheanalysisofhourlydata,andthisshowsthathighandlowwaterdatacanbeusedtoextracttidalconstantswithhighaccuracy.Theanalysisresultalsoshowsthattheinferenceandtheweightingcoefficientareimportantinthehighandlowwaterdataanalysis,anditissuggestedthatw≥1shouldbetakeninmonthlyhighandlowwaterdataanalysis.Thisanalysismethodcanbeuseddirectlytoanalyzealtimetricdatawithw=0.