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Love Wave Normal Modes Identify Continental Mantle Earthquakes
Love Wave Normal Modes Identify Continental Mantle Earthquakes
Love Wave Normal Modes Identify Continental Mantle Earthquakes

상세정보

자료유형  
 학위논문 서양
최종처리일시  
20260202104741
ISBN  
9798290649337
DDC  
551.22
저자명  
Wang, Shiqi.
서명/저자  
Love Wave Normal Modes Identify Continental Mantle Earthquakes
발행사항  
[Sl] : Stanford University, 2025
발행사항  
Ann Arbor : ProQuest Dissertations & Theses, 2025
형태사항  
267 p
주기사항  
Source: Dissertations Abstracts International, Volume: 87-03, Section: B.
주기사항  
Advisor: Klemperer, Simon.
학위논문주기  
Thesis (Ph.D.)--Stanford University, 2025.
초록/해제  
요약This dissertation proposes and develops a new method to identify continental mantle earthquakes (CMEs) by exploiting the amplitude ratio of regional seismic phases Sn and Lg(Sn/Lg), which are guided waves in the upper mantle and the crust, respectively. Traditional approaches to distinguishing crustal from mantle events are hampered by uncertainties in depth determinations and crustal thickness models. Instead, this work develops a physically motivated and easily applicable discriminant based on Love-wave normal modes, which circumvents those uncertainties by relying solely on the waveform characteristics of the candidate earthquake. Numerical simulations and observational data demonstrate that Sn/Lg ratios display strong bimodal separation between mantle and crustal earthquakes, with the method validated in the tectonically complex Tibetan Plateau.The dissertation further investigates how crustal-thickening and thinning-major perturbations to Sn and Lg waveguides-affect the discriminant. Through extensive 2.5D full-waveform simulations using enhanced AxiSEM3D, it is shown that Sn/Lg remains a stable metric under both thickening and thinning regimes, while frequency-based metrics, i.e. Sn HF/LF or Lg HF/LF, though motivated from the same normal mode theory as the amplitude metric, are more sensitive and less reliable. Observational data across the Himalaya corroborate the simulations, demonstrating that the Sn/Lg method is viable even in regions with complex Moho topography. Together, these studies provide a unified framework for identifying continental mantle earthquakes globally, a feat unattainable by all previous methods.A bonus chapter explores simulated earthquake cycles from the perspective of nonlinear dynamical systems. Rate-and-state friction governed systems, from lowdimensional spring-slider models to high-dimensional fault systems, are analyzed using measures such as Lyapunov exponents and correlation dimension. This allows for quantitative characterization of system complexity and reveals distinct dynamical regimes, which could improve interpretation of observed earthquake recurrence patterns and slow-slip phenomena in simulations, as well as laying the groundwork for bridging numerical earthquake simulations with complex real-world fault behavior.
일반주제명  
Earthquakes
일반주제명  
Lithosphere
일반주제명  
Eigenvectors
일반주제명  
Geometry
일반주제명  
Geotechnology
일반주제명  
Geophysics
일반주제명  
Geology
키워드  
Continental mantle earthquakes
키워드  
Tibetan Plateau
키워드  
High-dimensional fault systems
기타저자  
Stanford University.
기본자료저록  
Dissertations Abstracts International. 87-03B.
전자적 위치 및 접속  
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MARC

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■020    ▼a9798290649337
■035    ▼a(MiAaPQ)AAI32149708
■035    ▼a(MiAaPQ)Stanfordqd588tg4868
■040    ▼aMiAaPQ▼cMiAaPQ
■0820  ▼a551.22
■1001  ▼aWang,  Shiqi.
■24510▼aLove  Wave  Normal  Modes  Identify  Continental  Mantle  Earthquakes
■260    ▼a[Sl]▼bStanford  University▼c2025
■260  1▼aAnn  Arbor▼bProQuest  Dissertations  &  Theses▼c2025
■300    ▼a267  p
■500    ▼aSource:  Dissertations  Abstracts  International,  Volume:  87-03,  Section:  B.
■500    ▼aAdvisor:  Klemperer,  Simon.
■5021  ▼aThesis  (Ph.D.)--Stanford  University,  2025.
■520    ▼aThis  dissertation  proposes  and  develops  a  new  method  to  identify  continental  mantle  earthquakes  (CMEs)  by  exploiting  the  amplitude  ratio  of  regional  seismic  phases  Sn  and  Lg(Sn/Lg),  which  are  guided  waves  in  the  upper  mantle  and  the  crust,  respectively.  Traditional  approaches  to  distinguishing  crustal  from  mantle  events  are  hampered  by  uncertainties  in  depth  determinations  and  crustal  thickness  models.  Instead,  this  work  develops  a  physically  motivated  and  easily  applicable  discriminant  based  on  Love-wave  normal  modes,  which  circumvents  those  uncertainties  by  relying  solely  on  the  waveform  characteristics  of  the  candidate  earthquake.  Numerical  simulations  and  observational  data  demonstrate  that  Sn/Lg  ratios  display  strong  bimodal  separation  between  mantle  and  crustal  earthquakes,  with  the  method  validated  in  the  tectonically  complex  Tibetan  Plateau.The  dissertation  further  investigates  how  crustal-thickening  and  thinning-major  perturbations  to  Sn  and  Lg  waveguides-affect  the  discriminant.  Through  extensive  2.5D  full-waveform  simulations  using  enhanced  AxiSEM3D,  it  is  shown  that  Sn/Lg  remains  a  stable  metric  under  both  thickening  and  thinning  regimes,  while  frequency-based  metrics,  i.e.  Sn  HF/LF  or  Lg  HF/LF,  though  motivated  from  the  same  normal  mode  theory  as  the  amplitude  metric,  are  more  sensitive  and  less  reliable.  Observational  data  across  the  Himalaya  corroborate  the  simulations,  demonstrating  that  the  Sn/Lg  method  is  viable  even  in  regions  with  complex  Moho  topography.  Together,  these  studies  provide  a  unified  framework  for  identifying  continental  mantle  earthquakes  globally,  a  feat  unattainable  by  all  previous  methods.A  bonus  chapter  explores  simulated  earthquake  cycles  from  the  perspective  of  nonlinear  dynamical  systems.  Rate-and-state  friction  governed  systems,  from  lowdimensional  spring-slider  models  to  high-dimensional  fault  systems,  are  analyzed  using  measures  such  as  Lyapunov  exponents  and  correlation  dimension.  This  allows  for  quantitative  characterization  of  system  complexity  and  reveals  distinct  dynamical  regimes,  which  could  improve  interpretation  of  observed  earthquake  recurrence  patterns  and  slow-slip  phenomena  in  simulations,  as  well  as  laying  the  groundwork  for  bridging  numerical  earthquake  simulations  with  complex  real-world  fault  behavior.
■590    ▼aSchool  code:  0212.
■650  4▼aEarthquakes
■650  4▼aLithosphere
■650  4▼aEigenvectors
■650  4▼aGeometry
■650  4▼aGeotechnology
■650  4▼aGeophysics
■650  4▼aGeology
■653    ▼aContinental  mantle  earthquakes
■653    ▼aTibetan  Plateau
■653    ▼aHigh-dimensional  fault  systems
■690    ▼a0372
■690    ▼a0373
■690    ▼a0428
■690    ▼a0467
■71020▼aStanford  University.
■7730  ▼tDissertations  Abstracts  International▼g87-03B.
■790    ▼a0212
■791    ▼aPh.D.
■792    ▼a2025
■793    ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17358717▼nKERIS▼z이  자료의  원문은  한국교육학술정보원에서  제공합니다.

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