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：Withtheimprovementofseismicobservationsystem,moreandmoreobservationsindicatethatearthquakesmaycauseseismicvelocitychange.However,theamplitudeandspatialdistributionofthevelocityvariationremainsacontroversialissue.RecentactivesourcemonitoringcarriedoutadjacenttoWenchuanFaultScientificDrilling(WFSD)revealedunambiguouscoseismicvelocitychangeassociatedwithalocalMs5.5earthquake.Here,wecarryoutforwardmodelingusingtwo-dimensionalspectralelementmethodtofurtherinvestigatetheamplitudeandspatialdistributionofobservedvelocitychange.ThemodeliswellconstrainedbyresultsfromseismicreflectionandWFSDcoring.Ourmodelstronglysuggeststhattheobservedcoseismicvelocitychangeislocalizedwithinthefaultzonewithwidthof*120mratherthandynamicstronggroundshaking.Andavelocitydecreaseof*2.0%withinthefaultzoneisrequiredtofittheobservedtraveltimedelaydistribution,whichcoincideswithrockmechanicalexperimentandtheoreticalmodeling.

简介：IntroductionRegionalseismicitytriggeredbybigearthquakesaswellasattershocksinsourcezonecouldbedetectedduetothehighseismicmonitoringcapabilitytoday(Anderson,etal,1994;Bodin,Gomberg,1994;Caskey,Wesnousky,1997;Deng,Sykes,1996;Hill,etal,1993;King,etal,19...