主余震序列地震動譜加速度的空間相關性研究

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中圖分類號：P315 文獻標志碼：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

近年來隨著結構全壽命設計理論的發(fā)展，余震作為一種自然災害愈發(fā)引起學者的關注。（剩余13252字）