主余震序列地震动谱加速度的空间相关性研究

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中图分类号：P315 文献标志码：A DOI：10.16385/j.cnki.issn.1004-4523.202307049

Abstract：Acording tocertain selectioncriteria，thispaperselects 8mainshock-aftershock events and 56O mainshockaftershock sequencesfromNGA-West2 groundmotiondatabase，usesASK14 ground motionpredictionequationtocarryoutresidualanaly sis onthemainshock-aftershocksequenes，obtainstheintraeventresidualofmainshock-aftershock sequencesateachstation，and standardizesthem.Accordingtothegeostatiticalsemivariogrammethod，teexponentialsemivariogrammodelandtemaafit ting methodareusedtocalculatethespatialautocoelationof thespectralaccelerationperiodofthemanshockaftershocksequence.Since the Pearsonlinearcorelationcoeffcientcanbetermeasure the linearrelatioshipbetween thefixed-distance Variables，thePearonlearelationcientisuedtoalulateteoselatioofthomalieditraevetsialsbe twendifrentspectralaceleratonperiodsofthmaisockaftershcksequencewitoutonsideringthespatialcooelatio. AccordingtoMarkov'shyothesis，espatialinfomationisitroducedintothcalculationofterossorelaionandthnthe expressionofthechangeofthespatialcrosscorrelationwiththespatialdistance（h）isobtained.Theresultsshowthatthemainshockisigniiantlydirentfroaftcksintesofpatialutocorelaonandosorrelationhaactesti，dfte shocksgenerallyhvehigherspatialcorelationinthelongperiodstage.Neglectingtespatialcorelationetweentemainshock andaftershocksorusingthecharacteristicsoftemainshcktoeplacethecharacteristicsofteaftershockswilladverselyectthe researchon earthquake hazard analysis，damage assessment，and thesynthesis of mainand aftershock sequences.

Keywords：mainshockaftershocksequence;semivariogram;spatialautocoelation;Markovmodel;spatialcrossorelation

近年来随着结构全寿命设计理论的发展，余震作为一种自然灾害愈发引起学者的关注。（剩余13252字）