Earthquakes, groundwater and surface deformation : exploring the poroelastic response to megathrust earthquakes

dc.contributor.advisorHesse, Marc
dc.contributor.committeeMemberGhattas, Omar
dc.contributor.committeeMemberFlemings, Peter
dc.contributor.committeeMemberDixon, Timothy H
dc.contributor.committeeMemberWallace, Laura
dc.creatorMcCormack, Kimberly Alison
dc.creator.orcid0000-0001-9154-1248
dc.date.accessioned2018-10-12T21:39:51Z
dc.date.available2018-10-12T21:39:51Z
dc.date.created2018-08
dc.date.issued2018-08-10
dc.date.submittedAugust 2018
dc.date.updated2018-10-12T21:39:51Z
dc.description.abstractThis thesis explores the poroelastic effects of large subduction zone earthquakes using numerical models and a variety of datasets with the overarching goal of beginning to deconvolve post-seismic geodetic deformation signals -- while exploring other interesting phenomena involving the poroelastic response to earthquakes along the way. Chapter 1 sets up an elastic inverse problem used to derive the initial slip condition. We formulate an adjoint-based inversion methodology to solve for the initial condition of the coupled poroelastic forward model within a consistent, finite element framework. Chapter 2 discusses the broad hydrological effects of large subduction zone earthquakes both in general and the predicted hydrological effects of the 2012 7.6 M [sunscript w] Nicoya Peninsula earthquake. It explores how different hydro-mechanical parameters affect both the instantaneous and time-dependent response and touches on some of the limitations of the models. Chapter 3 focuses on the potential effect of poroelastic deformation on post-seismic geodetic signals. Here we look at the relationships between the co-seismic pore pressure changes and different components of poroelastic deformation. It then compares the modeled surface deformation timeseries to the measured deformation at a number of GPS stations. The last chapter walks through the suite of models and data interpolation functions included in the open source toolbox built during this project.
dc.description.departmentGeological Sciences
dc.format.mimetypeapplication/pdf
dc.identifierdoi:10.15781/T2BR8N160
dc.identifier.urihttp://hdl.handle.net/2152/68892
dc.language.isoen
dc.subjectPoroelasticity
dc.subjectEarthquakes
dc.subjectPost-seismic deformation
dc.subjectGeodetic inversion
dc.titleEarthquakes, groundwater and surface deformation : exploring the poroelastic response to megathrust earthquakes
dc.typeThesis
dc.type.materialtext
thesis.degree.departmentGeological Sciences
thesis.degree.disciplineGeological sciences
thesis.degree.grantorThe University of Texas at Austin
thesis.degree.levelDoctoral
thesis.degree.nameDoctor of Philosophy
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