Effects of topography on 3D seismic ground motion simulation with an application to the Valley of Aburrá in Antioquia, Colombia

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dc.contributor.advisorJaramillo Fernández, Juan Diego
dc.contributor.authorRestrepo Sánchez, Doriam Leidin
dc.coverage.spatialMedellín de: Lat: 06 15 00 N degrees minutes Lat: 6.2500 decimal degrees Long: 075 36 00 W degrees minutes Long: -75.6000 decimal degreeseng
dc.creator.degreeMagíster en Ingenieríaspa
dc.creator.emaildrestre6@eafit.edu.cospa
dc.date.accessioned2016-03-10T16:08:29Z
dc.date.available2016-03-10T16:08:29Z
dc.date.issued2013
dc.description.abstractThis dissertation presents a numerical scheme based upon the finite element framework for the numerical modeling of earthquake-induced ground motion in the presence of realistic topographic variations of the Earth’s crust -- We show that by adopting a non-conforming meshing scheme for the numerical representation of the surficial topography we can obtain very accurate representations of earthquake induced ground motion in mountainous regions -- From the computational point of view, our methodology proves to be accurate, efficient, and more importantly, it allows us to preserve the salient features of multi-resolution cubic finite elements -- We implemented the non-conforming scheme for the treatment of realistic topographies into Hercules, the octree-based finite-element earthquake simulator developed by the Quake Group at Carnegie Mellon University -- We tested the benefits of the strategy by benchmarking its results against reference examples, and by means of convergence analyses -- Our qualitative and quantitative comparisons showed an excellent agreement between results -- Moreover, this agreement was obtained using the same mesh refinement as in traditional flat-free simulations -- Our approach was tested under realistic conditions by conducting a comprehensive set of deterministic 3D ground motion numerical simulations in an earthquake-prone region exhibiting moderate-to-strong surficial irregularities known as the Aburr´a Valley in Antioquia-Colombia -- We proposed a 50 50 25 km3 volume to perform our simulations, and four Mw = 5 rupture scenarios along a segment of the Romeral fault; a significant source of seismic activity of Colombia -- We created and used the Initial Velocity Model of the Aburr´a Valley region (IVM-AbV) which takes geology as a proxy for shear-wave velocity -- Each earthquake model was simulated using three different models: (i) realistic 3D structure with realistic topography; (ii) realistic 3D structure without topography; and (iii) homogeneous half space with realistic topography. Our results show how topographic irregularities greatly modify the ground response -- In particular, they highlight the importance of the combined interaction between source-effects, focusing, soft-soil conditions, and 3D topography -- We provide quantitative evidence of this interaction and show that topographic amplification factors at some locations can be as high as 500 percent, while some other areas experience reductions -- These are smaller than the amplifications, on the order of up to 100 percentspa
dc.identifier.urihttp://hdl.handle.net/10784/8161
dc.language.isospaspa
dc.publisherUniversidad EAFITspa
dc.publisher.departmentEscuela de Ingenieríaspa
dc.publisher.programMaestría en Ingenieríaspa
dc.rights.accessrightsinfo:eu-repo/semantics/openAccesseng
dc.rights.localAcceso abiertospa
dc.subjectTerremotos - Métodos de simulación - Valle de Aburrá (Antioquia)spa
dc.subjectSimulación numéricaspa
dc.subjectModelado numéricospa
dc.subject.keywordFinite element methodspa
dc.subject.keywordComputer simulationspa
dc.subject.keywordSimulation methodsspa
dc.subject.keywordGeology, structuralspa
dc.subject.keywordSeismic wavesspa
dc.subject.keywordComputer graphicsspa
dc.subject.lembMÉTODO DE ELEMENTOS FINITOSspa
dc.subject.lembSIMULACIÓN POR COMPUTADORESspa
dc.subject.lembMÉTODOS DE SIMULACIÓNspa
dc.subject.lembGEOTECTÓNICAspa
dc.subject.lembTERREMOTOSspa
dc.subject.lembONDAS SÍSMICASspa
dc.subject.lembGRÁFICOS POR COMPUTADORspa
dc.titleEffects of topography on 3D seismic ground motion simulation with an application to the Valley of Aburrá in Antioquia, Colombiaspa
dc.typemasterThesiseng
dc.typeinfo:eu-repo/semantics/masterThesiseng
dc.type.hasVersionacceptedVersioneng
dc.type.localTesis de Maestríaspa

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Doctorado en Ingeniería (tesis)