简介：Inthispaper,researchofaftershockmechanismsisreviewed,includingheterogeneityofmediumandstress,mechanicalloading,fluidintrusionandstresscorrosion,andratestatedependence.Previousstudieshaveindicatedthattheheterogeneityofmediaandstressisthebasicpremiseofaftershocksgenerated.Fromthepointviewofmechanics,transientcreepandafterslipcanexplainthedecayofaftershocksinashorttimeafteramainshockandtherelaxationofstresstendstointerpretthecharacteristicsoflong-termaftershocks.Fluidintrusionandstresscorrosioncontroltheevolutionprocessoftheaftershocksundercertainconditions.Theinteractionbetweenthefaultsperturbedbythemainshockalwaysexistsduringtheaftershockactivities.Allkindsofmodelsandthetheorieswanttocomplywiththetwobasicpower-lawrelationships---theG-RlawandOmorilawtosomeextent.

简介：ＤｅｆｏｒｍａｔｉｏｎｄａｔｕｍｉｎｓｏｕｒｃｅｍｅｃｈａｎｉｓｍｉｎｖｅｒｓｉｏｎＳＨＯＵ－ＷＥＮＧＯＮＧ（巩守文，ＱＩＮＧ－ＬＩＡＮＧＷＡＮＧ（王庆良），ＹＩ－ＱＩＮＧＺＨＵ（祝意青）ａｎｄＢＩＮＧＣＨＥＮ（陈兵）（ＳｅｃｏｎｄＣｒｕｓｔａｌＤｅ...

简介：Ｓｅｉｓｍｏｇｅｎｉｃ　ｍｅｃｈａｎｉｓｍ　ｏｆ　ｔｈｅ　Ｌａｎｃａｎｇ　ａｎｄ　Ｇｅｎｇｍａ　ｅａｒｔｈｑｕａｋｅｓ（俞维贤）（周瑞琦）（候学英）（周光全）ＳｅｉｓｍｏｇｅｎｉｃｍｅｃｈａｎｉｓｍｏｆｔｈｅＬａｎｃａｎｇａｎｄＧｅｎｇｍａｅａｒｔｈ...

简介：1,209earthquakesoccurredinXianyou,FujianfromAugust4,2010toOctober4,2013.ThelargestearthquakewasML5.0onSeptember4,2013.InordertostudytheXianyouearthquakesequenceandunderstandthecausativestructureandstressfieldofXianyou,thefocalmechanismsolutionsofsixearthquakes(ML>3.5)intheXianyouearthquakesequencearecalculatedusingthebroadbanddigitaldataoftheFujianSeismicNetworkwiththeseismicmomenttensorinversemethod.Theresultsshowthatthefocalfaultsofthesixearthquakesaresimilar,whichareallstrike-slipfaultsstrikingtothenorthwestwithhighdipangles.ThedirectionoftheprincipalcompressivestressaxesisnearSN,whichisdifferentfromthestressfieldofFujianregion.TheXianyouearthquakesequencemayhavebeeninducedbythestressadjustmentaftertheimpoundmentofJinzhongreservoir.

简介：

简介：Inthispaper,therelationshipsoftheplungesandazimuthsofTandPaxesversusthestrikes,dips,andrakesoftwoseismicnodalplaneswerederivedtoprovidereferenceforearthquakeresearchers.TheindependenceoftheplungesandazimuthsofT,B,andPaxesinfocalmechanismsolutionwasdiscussed,anditwasconcludedthatthreeparameters,i.e.,theazimuthsofT,BandPaxes,arecompletelyindependent.ThefocalmechanismsolutionrepresentationbasedonEulerrotationwasintroduced,usingthreeEuleranglesinplaceoftheplungesandazimuthsofT,B,andPaxes,andthreefocalmechanismsolutionrepresentationswerebrieflycomparedandanalyzedinrespectofaccuracyonthebasisoftheassumptionofrounding;itwasconcludedthattheEuleranglerepresentationhasbetteraccuracy,comparedwiththeazimuthrepresentationandthetraditionalrepresentationwithT,B,andPaxes.

简介：ＩｎｔｒｏｄｕｃｔｉｏｎＭａｎｙｅａｒｔｈｑｕａｋｅｓｈａｖｅｐｒｏｖｅｎｔｈａｔｔｈｅｒｅｅｘｉｓｔｅｄｓｈａｌｏｗｇｅｏｔｅｍｐｅｒａｔｕｒｅａｎｏｍａｌｉｅｓａｒｏｕｎｄｔｈｅｅａｒｔｈｑｕａｋｅｒｅｇｉｏｎｓｂｅｆｏｒｅｔｈｅｅｖｅｎｔｓｏｃ...

简介：Anexperimentofuniaxialcompressionwascarriedoutonsamplesof8representativerocktypes.Thetemporalvariationsoftheremanentmagnetization,strainandacousticemissionofsampleswererecordedandinvestigated,especiallywhenthesampleswereunderconstantloadandwhentheyhadjustbeenunloaded.Itwasfoundthatmostsamplesstillshowedchangesoftheirremanentmagnetizationunderconstantloadandthetendencyofthesechangesremainedthesameasthatbeforetheloadhadbeenkeptconstant.Inthemeantime,similarchangesofstrainswereobservedaswell.However,inashorttimeperiodimmediatelyafterthesamplehadbeencompletelyunloaded,thevariationsofremanentmagnetizationandstrainswerestillobserved.Theabovephenomenaseemtobethereflectionofrheologicalpropertiesofrocks.Itisinterestingtonotethatsomesimilarphenomenawerealsofoundinfieldobservations,suchasaseismicgeomagneticchangesandsecularvariationinlocalgeomagneticfieldbeforeandaftere

简介：Inthispaper,thefocusdepthdistributionofearthquakeswitheachmagnitudehasbeenanalyzed.Statisticdatashowthatthelowermagnitudeis,thewiderfocusdepthdistributes.Withlargermagnitude,thefocustendstobeconcentratedinupperormiddlecrustallayers.Weanalyzedthecauseoffocusdepthdistributionandexplainedtheprecursormechanismofsmallandmoderateearthquakeswithoccurringconditionandcharacteristicsofstrongearthquakes.Theresultsofthispapermaybeappliedtodeterminerisksitesofstrongearthquakes.

简介：AsymmetryoftheWeiheBasinisdiscussedinthepaper,andalsothemastercontrolfault,secondarycontrolfaultofasymmetricbasinisproposedinthepaper.TheasymmetryoftheWeiheBasinisexpressedasfollows:(1)itsshapeofthecrosssectionsisasymmetrical;(2)thetectonicactivityofthesouthernmarginfaultandthenorthernmarginoneisapparentlydifferent;(3)itsdeeptectonicsisasymmetrical.Finally,weusetheWeiheBasinasanexampletoestablisha"cantilever-beam"modelforcalculations.Theresultsshowthat:(1)flexureleadstostressaccumulationandformingextensionalfractures;(2)fracturesslopesteeplytowardsthefreeend;(3)whenthelengthofbeambecomeslonger,itispossiblethatnewextensionalfractureswilloccurinthefixedend.

简介：Recenthigh-resolutiondeepseismicreflectionprofileacrosstheKunlunfaultinnortheasternTibetshowsclearlythattheMohoiscutoffbyacomplexthrustfaultsystem.Mohooffsetisageneralphenomenon,butlittleisknownaboutthedynamicmechanism.Inthisstudy,contactmodelswithMaxwellmaterialsareusedtosimulatethemechanicalprocessofMohooffsetinducedbytheaseismicslipofdeeplyburiedfaults.Basedontheseismicreflectiondata,weprojectasinglefaultmodelandacomplexfaultsystemmodelwithtwofaultsintersecting.ThedeformationsoftheMoho,theaseismicslips,andcontactstressesonfaultsindifferentmodelsarediscussedindetail.ResultsshowthattheMohooffsetmightbeproducedbyaseismicslipofdeeplyburiedfaults,andthemagnitudeisinfluencedbythefrictioncoefficientoffaultsandtheviscosityofthelowercrust.ThemaximumslipoccursneartheMohoonthesinglefaultoratthecrossingpointoftwointersectingfaultssystem.StressconcentratesmainlyontheMoho,thedeependoffaults,orthecrossingpoint.ThisstudywillthrowlightonunderstandingthemechanismofMohooffsetandaseismicslipofdeeplyburiedfaults.Theresultsofcomplexfaultsystemwithtwofaultsintersectingarealsousefultounderstandtheshallowintersectingfaultsthatmaycauseearthquakes.

简介：Comprehensivestatisticalanalysiswasperformedonthebasicfeaturesoffocalmechanismsof619ML≥2.0earthquakeswhichoccurredinthecapitalcircleareafromJanuary2002toJune2010.Bydividingthecapitalareaintothreestudyingregionsbasedonregionaltectoniccharacteristics,clusteranalysiswasconductedonthefocalmechanismsofallsubregionsusingthelongestdistancemethodinthestatisticalclusteranalysistostudythecharacteristicsoftectonicstresstensors.TheresultshowsthatdominantP-axisazimuthdistributionisNNE-NEEandthatofT-axisisNNW-NWW,mostofthefocalareasarecontrolledbyahorizontalstressfieldandruptureismainlyofhorizontalstrike-slip.ThemaximumprincipalcompressionstressorientationisNE75°inthewest,NE62°inthemiddle,andnearEWintheeastofthecapitalarea.Theregionaltectonicstressfieldischaracterizedbyhorizontalcompression.

简介：隔离轴承和dampers经常在墩和上层建筑之间被安装在大地震下面减少桥的地震回答。这份报纸论述为桥更潮湿的新奇的钢。更潮湿作为精力驱散部件采用钢盘子，并且采用垂直免费机制完成一个大变丑能力。用用称为ABAQUS的一个有限元素节目的控制排水量的周期的装载和数字分析的伪静电干扰测试被进行调查行为更潮湿，并且设计方法论基于测试和数字分析被建议。从这研究获得的主要结论如下：(1)新dampers在大排水量下面有稳定的磁滞现象行为；(2)有限元素分析能模仿行为与令人满意的精确性更潮湿；并且(3)简化了设计方法论更潮湿是有效的。

简介：

简介：Inthepaper,sourcemechanismsof33small-moderateearthquakesoccurredinYunnanaredeterminedbymodelingofregionalwaveformsfromYunnandigitalseismicnetwork.TheresultshowsthatmostearthquakesoccurredwithinorneartheChuandianrhombicblockhavestrike-slipmechanism.TheorientationsofmaximumcompressivestressesobtainedfromsourcemechanismarechangedfromNNW-SSNtoNSintheareasfromnorthtosouthoftheblock,andtensilestressesaremainlyinENE-WSWorNE-SE.IntheeasternTibetanPlateau,theorientationsofmaximumcompressivestressradiatetowardoutsidefromtheplateau,andthetensilestressorientationsmostlyparalleltoarcstructures.Near28°Ntheorientationsofbothmaximumcompressivestressandtensilestresschangedgreatly,andtheboundaryseemstocorrespondtothesouthwesternextendedlineofLongmenshanfault.OutsideoftheChuandianrhombicblock,theorientationsofPandTaxesaresomedifferentfromthosewithintheblock.Thecomparisonshowsthatthesourcemechanismofsmall-moderateeventspresentedinthepaperisconsistencewiththatofmoderate-strongearthquakesdeterminedbyHarvardUniversity,whichmeansthesourcemechanismofsmall-moderateeventscanbeusedtostudythetectonicstressfieldinthisregion.

简介：ＩｎｔｒｏｄｕｃｔｉｏｎＴｈｒｏｕｇｈ２０－ｏｄｄｙｅａｒｓ’ｏｂｓｅｒｖａｔｉｏｎａｎｄｓｔｕｄｙａｆｔｅｒｔｈｅ１９７６Ｔａｎｇｓｈａｎｇｒｅａｔｅａｒｔｈｑｕａｋｅ，ｔｈｅｓｅｉｓｍｏ－ｅｌｅｃｔｒｏｍａｇｎｅｔｉｃｒａｄｉａｔｉｏｎｐｒｅｃ...

简介：

简介：用在北Tianshan区域的24中等强烈的地震的焦点的机制解决方案，我们执行了系统簇和压力域倒置analysis.The结果显示那，中等强烈的地震的焦点的机制解决方案主要是dipslip颠倒在地震的飞机是的北Tiaushanarea.The主管破裂指责NW-oriented.It与在它主要compressi的邻近的area.The方向的地震结构的罢工基本上一致

简介：Heatflowisinevitablyaccompaniedbytemperaturechange,thus,thewatertemperaturecoseismicresponseduringearthquakeactivityshouldalsoobeythelawsofthermodynamics.TakingtheMS8.0Wenchuan,Sichuan,ChinaearthquakeandtheM9.0Tohoku,Japanearthquakeasanexample,andbasedonthedataofwatertemperaturecoseismicresponsesobservedinwellZK26inHaikou,HainanProvince,China,weinvestigatetherelationshipbetweenwellwatertemperaturechangeandheattransferinthecoseismicresponseprocessandtherelevantthermodynamicmechanismbyusingthenumericalsimulationmethodforthermodynamicequations.Then,throughforwardmodeling,weobtainseveralsimulationcurvesofwatertemperaturechangeinresponsetoearthquakesalongthewelldepthatdifferenttimes.Thesimulatedcurvesofwatertemperaturechangeapproximatelyfittheobservedcurves.Consequently,basedonthevariationoftemperature,wefindthatthemodesofwellwatertemperaturecoseismicresponse(ascending,descendingorstable)arerelatedtofactorssuchasthelocationofsensors,distributionandlocationofheatsources,thespanbetweensensorsandheatsources.

简介：Ｒｅｓｅａｒｃｈｏｎｔｅｍｐｏｒａｌａｎｄｓｐａｔｉａｌｄｉｓｔｒｉｂｕ┐ｔｉｏｎ，ｅｖｏｌｕｔｉｏｎａｒｙｃｈａｒａｃｔｅｒａｎｄｍｅｃｈａｎｉｓｍｏｆｃｒｕｓｔａｌｄｅｆｏｒｍａｔｉｏｎｆｉｅｌｄｂｅｆｏｒｅａｎｄａｆｔｅｒｔｈｅＴａｎｇｓｈａｎ...