简介：Inordertosolvetheproblemofearlyestimationofmoderatelystrongaftershockdurationtimeinanearthquakesequence,thisstudyhasbeenconducted.First,thedefinitionofthestrongaftershockhasbeengiven.Itispointedoutthatthereisadifferenceinthestrongaftershockdurationtimebetweenthemainshocktypesequenceandthestrongearthquakeswarmsequence.Afterdividingthethreecases,i.e.,astrongaftershockdurationtimelargerthan1day,smallerthan1day,andnostrongaftershockoccurredinamainshocktypesequencebyusingthepatternrecognitionmethod,wegavetheroughcorrelationrelationbetweenstrongaftershockdurationtimeandfirstlargeshockmagnitudefortwotypesofsequences.Finally,thejudgmentindexandmethodofestimatingstrongaftershockdurationtimesfordifferentsequencetypeshavebeengiven.

简介：Itiswidelyknownthattheseismicresponsecharacteristicsofasoilsitedependsheavilyonseveralkeydynamicpropertiesofthesoilstratum,suchaspredominantfrequencyanddampingratio.Awidelyusedmethodforestimatingthepredominantfrequencyofasoilsitebyusingmicrotremorrecords,proposedbyNakamura,isinvestigatedtodetermineitseffectivenessinestimatingthedampingratio.TheauthorsconductedsomemicrotremormeasurementsofsoilsitesinHongKongandfoundthatNakamura'smethodmightalsobeusedtoestimatethedampingratioofasoilsite.DampingratiodatafromseveraltypicalsoilsiteswereobtainedfrombothNakamura'sratiocurvesusingthehalfpowerpointmethodandresonantcolumntests.Regressionanalysisindicatesthatthereisastrongcorrelationbetweenthedampingratiosderivedfromthesetwodifferentapproaches.

简介：在最近的年里，几个研究组为对存在大楼的地震反应评价学习了分析方法的新一代。不过，许多重要开发仍然被需要以便定义更多的可靠、有效的评价过程。而且关于存在大楼，由于低知识水平，线性有弹性的分析是允许的唯一的分析方法，这应该被加亮。一样的代码(例如NTC2008，EC8)为地震需求的评估与行为因素把线性动态分析看作参考方法。这类分析基于一个线性橡皮的结构的模型题目到一个设计系列，由通过一个行为因素减少有弹性的光谱获得了。行为因素(在一些代码的减小因素或q因素)被用来减少从线性分析获得以便考虑非线性的结构的能力的有弹性的光谱纵标或力量。行为因素应该基于几个参数被定义，例如机械材料特征，结构的系统，不规则和设计过程影响地震非线性的能力。在实际应用程序，仍然有详细规则和为存在大楼足够的精确行为因素价值的明显的缺乏。在这个工作，造类型的主要存在RC-MRF的地震能力的一些调查被执行了。为了做地震力量的正确评估，要求，与力量协调的实际行为因素价值基于地震安全评价过程被建议了并且在意大利的地震代码与价值相比报导了，NTC08。

简介：事件波浪的明显的速度是为与理论方法模仿旋转地面运动的一个重要参数，但是当仅仅有单个record.This时，纸在一块多层的各向同性的橡皮基于elastodynamic理论讨论一个P-SV比率方法，有效地对估计困难在SMARTI的四地震的明显的速度穿的半space.The与这method.The结果被计算接近使用旅行时间analysis.Furthermore的一个方法，因素

简介：Amethodofestimationofoccurrenceprobabilityofearthquakeintensityatagivensitefromtheresultsofaten-yearscaleofearthquakepredictiondescribedwithaprobabilityofoccurrenceinagiven"predictioncell"isproposedinthispaper.2316citiesandtownsinChinawereanalyzedbyusingthismethod.TheprobabilityofintensityⅥ-Ⅸweregivenforeverycity.Theseresultscanbeusedfortheearthquakeinsurance,lossestimation,andplanningofdisasterprotection.

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简介：Forearthquakedisastermitigation,weusehistoricalrecordsandmorecompleteintensityinvestigationdatafrom1500to2015toanalyzeandestimatetheseismicintensityandfrequencyoftheearthquake-proneareasinYunnan.WedigitizedintensityobservationsanddividedtheYunnanregionintocellsizeof0.2°x0.2°tocalculatetheseismicintensity-frequencyrelationshipforeachcell.CombinedwitharepeatedcycleofintensityofonehundredyearsandpopulationeconomicsdatainYunnan,weanalyzefutureareasofconcern.Theresultscanprovideareferenceforearthquakehazardousareazoning.Thismethodisbasedonhistoricalearthquakedata,reducingasmuchaspossiblethevarioushypothesesfortheassessment,andthuscanconciselyreflectthedifferentintensityfrequencydistributionsoftheregion.

简介：对代表频率依赖者土壤阻抗的简化物理模型的需要是在在整个历史的许多研究后面的动机。通常，如此的模型被产生在大量刺激频率捕获阻抗功能，它导致相对复杂的模型。是当只有确实影响结构的反应的频率的一个有限范围时。这里，新方法论基于匹配反应的概念被建议，它能导致更简单的分离模型的发展。这个想法然后被用来升级存在到嵌入的基础的盒子的表面基础的简单模型。在频率领域和有嵌入的基础的土壤结构系统的时间领域分析的模型的适用性被讨论。而且，结果的精确性与另一存在相比为嵌入的基础的分离模型。

简介：Inthisstudy,theNorthChinaseismicregionwasselectedasthestudyarea,andevaluationofseismichazardusingthespatialsmoothingseismicitymodelwasperformed.Firstly,thestudyareaisdividedintogrids,andsomeparameters(e.g.b-value,M0,Mu,azimuthandM-Lrelationship)foreachseismotectonicmodelwereassigned.Secondly,usingellipticalsmoothingbasedonaseismotectonicbackgroundmodel,thestatisticalearthquakeincidencerateineachgridissuccessivelycalculated.Lastly,therelevantgroundmotionattenuationrelationshipischosentoassessseismichazardofgeneralsites.Themapsforthedistributionofhorizontalpeakgroundaccelerationwith10%probabilityofexceedancein50yearswereobtainedbyusingtheseismichazardanalysismethodbasedongridsource.Thisseismicitymodelsimplifiesthemethodologyofprobabilisticseismichazardanalysis,especiallyappropriateforthoseplaceswhereseismictectonicsisnotyetclearlyknown.Thismethodcanprovidevaluablereferencesforseismiczonationandseismicsafetyassessmentforsignificantengineeringprojects.

简介：基于中国数字地震网络在最近的年里报导的地震目录，我们与表面波浪大小和本地大小选择地震并且适合他们进在二大小之间的一种关系。系统的差别从被用于30年的公式被发现。因为一个大动态范围和当前的数字观察系统的宽频率范围，除了与以前相比被使用的很多车站和地震，在这份报纸获得的关系似乎更可靠。我们的计算证明在大小变换前后没有重要差别因此我们建议大小变换的放弃。一个车站的地点反应在不同频率由扩大组成。扩大等于大约1并且在位于地下室的车站与频率改变很少岩石，和它在低频率范围比1大，不到1在位于沉积层的车站在高频率变化。来自位于沉积层的单个车站的大小和从整个网络的平均大小之间的差别增加从对否定与时期积极。看起来没有固定车站修正因素，车站修正方法不工作改进精确性和大小估计。

简介：Basedonpreviousresearchresults,present-daycrustaldeformationandgravityfieldsintheChinesemainlandareanalyzedusingtheGPSdata,leveling,gravityandcross-faultdeformations.Weanalyzedstrainaccumulationofthemajorfaults,andidentifiedlockedorhighstrainaccumulationsegments.Combiningtheeffectsoflargeearthquakesinthestudyarea,thelong-term(decade)probabilityoflargeearthquakesintheChinesemainlandisestimated.

简介：Digitalelevationmodel(DEM)canbegeneratedbyinterferometricsyntheticapertureradar(InSAR).Inthispaper,theinterferometricprocessingandanalysesarecarriedoutforDamxung-YangbajainareainTibet,usingapairofEuroperemote-sensingsatellite(ERS)-1/2tandemSARimagesacquiredon6and7April1996.AportionoftheIn-SAR-derivedDEMisselectedandcomparedwiththe1:50000DEMtodeterminetheprecisionoftheInSAR-derivedDEM.Thecomparisonindicatesthattherootmeansquarederrors(RMSE),whichareusedtoevaluateerror,areabout35,60,10,and15minthestudiedarea,mountainousarea,basinareaandnear-faultarea,respectively,suggestingthatobviouserrorsaremainlyinmountainousarea.Besides,thelimitationofInSARtechnologytogenerateDEMisanalyzed.OurinvestigationshowsthatInSARisaneffectivetoolingeodesyandanimportantcomplementtofieldsurveyinginsomedangerousareas.

简介：TheHori’sinversemethodbasedonspectraldecompositionwasappliedtoestimatecoseismicslipdistributionontheruptureplaneofthe14November2001MS8.1KunlunearthquakebasedonGPSsurveyresults.TheinversionresultshowsthatthesixslidingmodelscanbeconstrainedbythecoseismicGPSdata.Theestablishedslipsmainlyconcentratedalongtheeasternsegmentofthefaultrupture,andthemaximummagnitudeisabout7m.Slipontheeasternsegmentofthefaultrupturerepresentsaspurelyleft-lateralstrike-slip.Sliponthewesternsegmentoftheseismicrupturerepresentsasmainlydip-slipwiththemaximumdip-slipabout1m.Totalpredictedscalarseismicmomentis5.196×1020N?m.Ourresultsconstrainedbygeodeticdataareconsistentwithseismologicalresults.

简介：Basedonthefittingonpaleoearthquakedataofintra-plateregionsinthenorthernpartofChi-naandgivingastatisticalmodeloftimeinterdependence,thepotentialdamageearthquakesinadefinitefutureperiodandcharacteristicsofpresentshocksalongtheLingwufaulthavebeenanalyzedbyusingdangerousprobabilityfunctionandsomenewdataconcerned.Wehavein-ferredthatthefaulthasenteredaperiodthatearthquakeswillprobablyoccur.ThereexistsapotentialdangerthatastrongearthquakewithMs7.0-7.5willoccurin10-100a.

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