简介：ＡｐｐｌｉｃａｔｉｏｎｏｆｃｅｒｔａｉｎｔｙｆａｃｔｏｒｓｏｆｅａｒｔｈｑｕａｋｅｐｒｅｃｕｒｓｏｒｙａｎｏｍａｌｙｅｖｉｄｅｎｃｅｓＣＦ（Ｅ）ＺＨＡＯ－ＢＩＺＨＥＮＧ（郑兆），ＪＵＮＺＨＡＮＧ（张军）ａｎｄＭＥＩＱＩＮＧ（庆梅）Ｓｅｉｓｍｏｌｏ...

简介：主要对ZD8B与ZD-8地电仪在观测的精度及稳定性、动态范围、抗干扰能力等方面进行了评价，并对观测数据进行了分析，认为地电仪观测资料可作为地震预报的可靠依据之一。

简介：ＣｅｒｔａｉｎｔｙｆａｃｔｏｒｓｏｆｅａｒｔｈｑｕａｋｅｐｒｅｃｕｒｓｏｒｙａｎｏｍａｌｙｅｖｉｄｅｎｃｅｓＣＦ（Ｅ）Ｚｈａｏ－ＢｉＺＨＥＮＧ（郑兆）（ＳｅｉｓｍｏｌｏｇｉｃａｌＢｕｒｅａｕｏｆＡｎｈｕｉＰｒｏｖｉｎｃｅ，Ｈｅｆｅｉ２３００３１，Ｃｈ...

简介：ＴｈｅｂｖａｌｕｅｓｐｅｃｔｒｕｍａｎｄηｖａｌｕｅｂｙｔｈｅｍｏｍｅｎｔｍｅｔｈｏｄＴｏｒｕＯｕｃｈｉ（大内）ＤｅｐａｒｔｍｅｎｔｏｆＥａｒｔｈＳｃｉｅｎｃｅｓ，ＦａｃｕｌｔｙｏｆＳｃｉｅｎｃｅ，ＫｏｂｅＵｎｉｖｅｒｓｉｔｙ，Ｋｏｂｅ，６５７，...

简介：ＣａｌｃｕｌａｔｉｏｎｏｆｂｖａｌｕｅａｎｄｉｔｓａｐｐｌｉｃａｔｉｏｎｉｎｅａｒｔｈｑｕａｋｅｐｒｅｄｉｃｔｉｏｎＨｕａ－ＣｈｅｎＤＵＡＮ（段华琛）；Ｃｈａｎｇ－ＱｉｎｇＦＡＮ（范长青）ａｎｄＹｕｅ－ＭｉｎＸＵ（许跃敏）（Ｓｅｉｓｍｏｌｏｇｉｃａｌ...

简介：Intheestimationofseismictendency,usingGutenberg-Richter￠sb-valueandusingHurstexponentaretwocom-monlyusedmethods.Basedonthefractalgeometryofearthquaketimeseries,wepointoutthatthesetwomethodscorrelatetoeachother.IntheperspectiveoffractionalBrownianmotion(FBM),anearthquakesequencewithb>3/4andthatwithb<3/4havedifferentdynamicproperties.

简介：本文讨论可信的历史地震资料和现代化仪器记录资料的统一使用问题。

简介：Basedonisotropiclinearporoelastictheoryandundertheundrainedcondition,wesummarizethreeequationsconnectingtheSkempton’scoefficientBwiththegroundwaterlevel.Afteranalysis,weproposeamethodtocalculatetheSkempton’scoefficientBaccordingtotherelationshipbetweenwaterlevelandtidalstrain.WiththismethodwecangetthevalueofBwithouttheearthquakeoccurrence,whichcanprovidethehighfrequencywavesforresearch.Besides,wecanalsogetthein-suitSkempton’scoefficientBwithouttheexperimentofrockphysics.Inaddition,weanalyzetheobserveddataofChangpingstationrecordedingroundwatermonitoringnetwork(abv.,GMN)beforeandaftertheWenchuanMS8.0withthismethod,andfindoutthere’saslightchangeofthevalueofBaftertheseismicwavespassedby,whichimpliesthatthepropagationofseismicwavesmayhavebroughtsomevariationstotheporoelasticmediumofthewell.

简介：Inthisstudy,weadoptanimprovedBayesianapproachbasedonfree-knotB-splinebasestostudythespatialandtemporaldistributionoftheb-value.SynthetictestsshowthattheimprovedBayesianapproachhasasuperiorperformancecomparedtotheBayesianapproachaswellasthewidelyusedmaximumlikelihoodestimation(MLE)methodinfittingtherealvariationofb-values.WethenapplytheimprovedBayesianapproachtoNorthChinaandfindthattheb-valuehasaclearrelevancetoseismicity.Temporalchangesofb-valuesarealsoinvestigatedintwospecificareasofNorthChina.Weinterpretsharpdecreasesintheb-valuesasusefulmessagesinearthquakehazardanalysis.

简介：TheeffectsofmagnituderoundingandofthepresenceofnoiseintheroundedmagnitudesontheestimationoftheGutenberg–Richterb-valueareexplored,andthewaystocorrectfortheseeffectsareproposed.Fortypicalvalues,b=1androundingintervalDM=0.1,theroundingerrorisapproximately-10-3anditcanbecorrectedtoanegligibleapproximately-10-5.Forthesametypicalvalues,theeffectofnoisecanbelarger,dependingonthecharacteristicsofthenoisedistribution;fornormallydistributednoisewithstandarddeviationr=0.1,thecorrectb-valuemaybeunderestimatedbyafactor*0.97.

简介：ＡｍｏｄｅｌｏｆｓｅｉｓｍｉｃｉｔｙｗｉｔｈｆｒａｃｔａｌｓｔｒｕｃｔｕｒｅｓａｎｄａｐｒｅｌｉｍｉｎａｒｙｄｉｓｃｕｓｓｉｏｎｏｎｔｈｅｒｅｌａｔｉｏｂｅｔｗｅｅｎＤａｎｄｂｖａｌｕｅＨａｔ－ＫｕｎＪＩＡＮＧ（蒋海昆）ａｎｄＳｈｏｕ－ＺｈｏｎｇＤＩ...

简介：ＣｕｍｕｌａｔｉｖｅｆｒｅｑｕｅｎｃｙｂｖａｌｕｅｗｉｔｈｏｕｔｕｐｐｅｒｂｏｕｎｄｍａｇｎｉｔｕｄｅａｎｄｉｔｓｒｅｇｒｅｓｓｉｏｎｄｅｔｅｒｍｉｎａｔｉｏｎＪｉａｎ－ＷｅｎＳＨＥＮ（沈建文）（ＳｅｉｓｍｏｌｏｇｉｃａｌＢｕｒｅａｕｏｆＡｎｈｕｉＰ...

简介：BecauseofthesignificancetotheformationandevolutionoftheTibetanplateau,thedisplacementandsliprateoftheAltynTaghfaulthavebeentopicsfullofdisputation.ScientistswhoholddifferentopinionsontheevolutionofTibetinsistondifferentslipratesanddisplacementsofthefaultzone.Inthearticle,studyisfocusedonthelateQuaternarysliprateoftheAltynTaghfaultwestoftheCherchenRiver(between85°Eand85°45'E).OnthebasisofhighresolutionSPOTimagesoftheregion,threesites,namelyKoramlik,AqqanpastureandDalakuansay,werechosenforfieldinvestigation.Tocalculatethesliprateofthefault,displacementofterraceswasmeasuredonSPOTsatelliteimagesorinsituduringfieldworkandthermo-luminescence(TL)datingmethodwasused.Togettheagesofterraces,samplesofsandwerecollectedfromtheuppermostsandbedsthatliejustunderloess.Themethodforcalculatingsliprateoffaultistodividethedisplacementofterracerisersbytheageofitsneighboringlowerterrace.Thedisplacementofriversisnotconsideredinthisarticlebecauseofitsuncertainties.AtKoramlik,thesliprateoftheAltynTaghfaultis11.6±2.6mm/asince6.02±0.47kaB.Pand9.6±2.6mm/asince15.76±1.19kaB.P.AtAqqanpasture,about30kmwestofKoramlik,thesliprateis12.1±1.9mm/asince2.06±0.16kaB.P.AtDalakuansayi,thesliprateofthefaultis12.2±3.0mm/asince4.91±0.39kaB.P.Hence,wegettheaveragesliprateof11.4±2.5mm/aforthewesternpartoftheAltynTaghFaultsinceHolocene.ThisresultisclosetothelatestresultsfromGPSresearch.

简介：本文通过对华北地区和西南地区完整地震目录按照均匀抽取和非均匀抽取2种原则进行抽取地震,得到了地震目录遗漏率和b值变化量间的经验关系式。结果表明,在进行非均匀抽取地震时,得到的地震目录遗漏率和b值的减小量间呈正比关系;在进行均匀抽取地震时,利用最小二乘法和极大似然法计算得到的b值变化较复杂,b值随地震目录遗漏率的增加,或为增加,或为减少。同时,在进行非均匀抽取地震时,地震目录遗漏率对极大似然法计算的b值影响大于最小二乘法计算的b值影响。

简介：TheTanlu(Tancheng-Lujiang)faultisoneofthemajorstructuresineasternChina,whichcutsacrossdifferentblocksandcontrolsthetectonicactivity.UsingtheseismicdatafromtheChinaEarthquakeNetworksCenter,weinvestigatethespatialvariationsoftheb-valueintheDabie-Sulu(Jiangsu-Shandong)organicbeltbycalculatingtheb-valueofeachgrid(1°×1°)from1970to2010.Thestudyshowsthat:theb-valueissmallerintheTanlufaultanditsadjacentarea,whichmightsuggestthatthemajorearthquakerecurrenceperiodisrelativelylongduetothelowerfrequencyofsmallearthquakeactivity.InbothsidesofTanlufault,theb-valueishigherattheedgeofSulublockandtheeasternpartofDabieorogenicbelt.ThebvaluesarehigherinNorthChinacentralorogenicbelt,andsmallearthquakeactivitywhichoccurredalongthecentralorogenicbeltisfrequent.Additionally,combinedwithgeologicalandgeophysicalstudy,wefindthattheb-valuehasacertaincorrespondencerelationshipwiththelithologicdistribution,whichinformsusthatseismicactivityfeaturesarecloselyrelatedtotheinhomogeneousmediainthecrust.

简介：

简介：SeismicityoftheEarth(MC4.5)wascompiledfromNEIC,IRISandISCcataloguesandusedtocomputeb-valuebasedonvarioustimewindows.Itisfoundthatcontinuouscyclicb-variationsoccuronbothlongandshorttimescales,thelatterbeingofmuchhighervalueandsometimesinexcessof0.7oftheabsoluteb-value.Thesevariationsoccurnotonlyyearlyormonthly,butalsodaily.Beforetheoccurrenceoflargeearthquakes,b-valuesstartincreasingwithvariablegradientsthatareaffectedbyforeshocks.Insomecases,thegradientisreducedtozeroortoanegativevalueafewdaysbeforetheearthquakeoccurrence.Ingeneral,calculatedb-valuesattainmaxima1daybeforelargeearthquakesandminimasoonaftertheiroccurrence.Bothlinearregressionandmaximumlikelihoodmethodsgivecorrelatable,butvariableresults.Itisfoundthatanexpandingtimewindowtechniquefromafixedstartingpointismoreeffectiveinthestudyofb-variations.Thecalculatedb-variationsforthewholeEarth,itshemispheres,quadrantsandtheepicentralregionsofsomelargeearthquakesareofbothlocalandregionalcharacter,whichmayindicatethatinsuchcases,thegeodynamicprocessesactingwithinacertainregionhaveamuchregionaleffectwithintheEarth.Theb-variationshavelongbeenknowntovarywithanumberoflocalandregionalfactorsincludingtectonicstresses.Theresultsreportedhereindicatethatgeotectonicstressremainsthemostsignificantfactorthatcontrolsb-variations.ItisfoundthatforearthquakeswithMwC7,anincreaseofabout0.20intheb-valueimpliesastressincreasethatwillresultinanearthquakewithamagnitudeoneunithigher.

简介：DearContributors,ReadersandFriends:2011milestonesthetenthanniversaryoftheJournalofEarthquakeEngineeringandEngineeringVibration.wefirstwanttotakethisopportunitytoexpressourgratitudetothoseretiringmembersoftheEditorialBoardfortheirvaluablecontributionsinthepast,andtowelcomethosewhojoinedtheEditorialBoardthisyear.AswementionedinourmessagetoyouinDecember2010,effective20ll,thejournalisofficiallyco-sponsoredbytheHuixianEarthquake

简介：Inthispaper,basedonGansuDigitalSeismicNetworkdatasince1990,wecalculatedb-valueand⊿b-valueoftheneighborhoodareabeforethe2013Minxian-ZhangxianM_S6.6,earthquake.Theresultsshowthattheearthquakeoccurredatthemarginofthesignificantlylowerb-valueareainsoutheastofGansuandbeforetheearthquaketheneighborhoodareahadanobviouslyabnormal⊿b-value.Fromtheearthquakeandthespatialdistributionoflowb-value,theregionstillhasthepossibilityofgeneratingdangerousstrongearthquakes.

简介：本文以地震带为统计单元,采用检验历史地震完整性的统计方法、年平均发生率法、比例系数法和史料考证。讨论华南沿海地震带历史地震的可靠性和与现代仪器记录资料统一使用的问题,确定合适的b值,进而较好的估计代表地震活动水平的年平均发生率ν值,为地震危险性分析提供可靠的地震带活动性参数