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Sensitivity Analysis of Solid Earth Processes Using Reduced-Order Models
Sensitivity Analysis of Solid Earth Processes Using Reduced-Order Models
Sensitivity Analysis of Solid Earth Processes Using Reduced-Order Models

상세정보

자료유형  
 학위논문 서양
최종처리일시  
20260202105300
ISBN  
9798270247881
DDC  
550
저자명  
Hobson, Gabrielle M.
서명/저자  
Sensitivity Analysis of Solid Earth Processes Using Reduced-Order Models
발행사항  
[Sl] : University of California, San Diego, 2025
발행사항  
Ann Arbor : ProQuest Dissertations & Theses, 2025
형태사항  
260 p
주기사항  
Source: Dissertations Abstracts International, Volume: 87-06, Section: B.
주기사항  
Advisor: May, Dave A.
학위논문주기  
Thesis (Ph.D.)--University of California, San Diego, 2025.
초록/해제  
요약Numerical models used to understand subduction zones and earthquake rupture are subject to uncertainty because the Earth's interior cannot be directly observed. Robust sensitivity analysis can quantify the influence of model parameter variability on model outcomes, but this is challenging due to the computational expense of the models combined with the high number of parameters of interest. To address this challenge, we present a framework for model order reduction in geophysical applications. We use the interpolated Proper Orthogonal Decomposition to build fully data-driven, non-intrusive reduced order models (ROMs). We build ROMs that accurately approximate output from subduction zone thermal models and earthquake dynamic rupture models and are orders of magnitude faster to evaluate. We present ROMs for 2D kinematic-dynamic models of subduction zone temperature, and use them to quantify the variability in slab interface temperatures that results from model input variability and different modeling assumptions. We find that model input variability results in significant variability in temperature and the inferred potential rupture extent for megathrust earthquakes at the Cascadia, Nankai and Hikurangi subduction zones. Moving to 3D, we build ROMs for 3D dynamic models of subduction and mantle flow, approximating viscosity, velocity and the second strain rate invariant in the Cascadia subduction zone. This study demonstrates that ROMs are effective tools that enable sensitivity analysis for high-dimensional 3D geodynamic models. Finally, we present a combined mesh morphing and model order reduction framework that allows us to quantify model sensitivity to geometric variability. We apply this method to meshes for 2D subduction zone thermal models, incorporating realistic slab interface curvature and depth uncertainties, and to 3D earthquake dynamic rupture models, varying fault dip angles across a 40° range. The mesh morphing method enables us to build ROMs that incorporate geometric variability, and we demonstrate this with ROMs built from dynamic rupture output that predict surface displacement and velocity time series for variable fault geometries. Together, these contributions provide a framework for robust sensitivity analysis of high-dimensional simulations for a range of geophysics problems.
일반주제명  
Geophysics
일반주제명  
Soil sciences
키워드  
Dynamic rupture
키워드  
Reduced-order modeling
키워드  
Sensitivity analysis
키워드  
Subduction zones
기타저자  
University of California, San Diego Scripps Institution of Oceanography
기본자료저록  
Dissertations Abstracts International. 87-06B.
전자적 위치 및 접속  
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MARC

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■006m          o    d                
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■020    ▼a9798270247881
■035    ▼a(MiAaPQ)AAI32281218
■040    ▼aMiAaPQ▼cMiAaPQ
■0820  ▼a550
■1001  ▼aHobson,  Gabrielle  M.
■24510▼aSensitivity  Analysis  of  Solid  Earth  Processes  Using  Reduced-Order  Models
■260    ▼a[Sl]▼bUniversity  of  California,  San  Diego▼c2025
■260  1▼aAnn  Arbor▼bProQuest  Dissertations  &  Theses▼c2025
■300    ▼a260  p
■500    ▼aSource:  Dissertations  Abstracts  International,  Volume:  87-06,  Section:  B.
■500    ▼aAdvisor:  May,  Dave  A.
■5021  ▼aThesis  (Ph.D.)--University  of  California,  San  Diego,  2025.
■520    ▼aNumerical  models  used  to  understand  subduction  zones  and  earthquake  rupture  are  subject  to  uncertainty  because  the  Earth's  interior  cannot  be  directly  observed.  Robust  sensitivity  analysis  can  quantify  the  influence  of  model  parameter  variability  on  model  outcomes,  but  this  is  challenging  due  to  the  computational  expense  of  the  models  combined  with  the  high  number  of  parameters  of  interest.  To  address  this  challenge,  we  present  a  framework  for  model  order  reduction  in  geophysical  applications.  We  use  the  interpolated  Proper  Orthogonal  Decomposition  to  build  fully  data-driven,  non-intrusive  reduced  order  models  (ROMs).  We  build  ROMs  that  accurately  approximate  output  from  subduction  zone  thermal  models  and  earthquake  dynamic  rupture  models  and  are  orders  of  magnitude  faster  to  evaluate.  We  present  ROMs  for  2D  kinematic-dynamic  models  of  subduction  zone  temperature,  and  use  them  to  quantify  the  variability  in  slab  interface  temperatures  that  results  from  model  input  variability  and  different  modeling  assumptions.  We  find  that  model  input  variability  results  in  significant  variability  in  temperature  and  the  inferred  potential  rupture  extent  for  megathrust  earthquakes  at  the  Cascadia,  Nankai  and  Hikurangi  subduction  zones.  Moving  to  3D,  we  build  ROMs  for  3D  dynamic  models  of  subduction  and  mantle  flow,  approximating  viscosity,  velocity  and  the  second  strain  rate  invariant  in  the  Cascadia  subduction  zone.  This  study  demonstrates  that  ROMs  are  effective  tools  that  enable  sensitivity  analysis  for  high-dimensional  3D  geodynamic  models.  Finally,  we  present  a  combined  mesh  morphing  and  model  order  reduction  framework  that  allows  us  to  quantify  model  sensitivity  to  geometric  variability.  We  apply  this  method  to  meshes  for  2D  subduction  zone  thermal  models,  incorporating  realistic  slab  interface  curvature  and  depth  uncertainties,  and  to  3D  earthquake  dynamic  rupture  models,  varying  fault  dip  angles  across  a  40°  range.  The  mesh  morphing  method  enables  us  to  build  ROMs  that  incorporate  geometric  variability,  and  we  demonstrate  this  with  ROMs  built  from  dynamic  rupture  output  that  predict  surface  displacement  and  velocity  time  series  for  variable  fault  geometries.  Together,  these  contributions  provide  a  framework  for  robust  sensitivity  analysis  of  high-dimensional  simulations  for  a  range  of  geophysics  problems.
■590    ▼aSchool  code:  0033.
■650  4▼aGeophysics
■650  4▼aSoil  sciences
■653    ▼aDynamic  rupture
■653    ▼aReduced-order  modeling
■653    ▼aSensitivity  analysis
■653    ▼aSubduction  zones
■690    ▼a0373
■690    ▼a0467
■690    ▼a0481
■71020▼aUniversity  of  California,  San  Diego▼bScripps  Institution  of  Oceanography.
■7730  ▼tDissertations  Abstracts  International▼g87-06B.
■790    ▼a0033
■791    ▼aPh.D.
■792    ▼a2025
■793    ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17360078▼nKERIS▼z이  자료의  원문은  한국교육학술정보원에서  제공합니다.

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