서브메뉴
검색
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
- Tibetan Plateau
- 기타저자
- Stanford University.
- 기본자료저록
- Dissertations Abstracts International. 87-03B.
- 전자적 위치 및 접속
- 로그인 후 원문을 볼 수 있습니다.
MARC
008260126s2025 us c eng d■001000017358717
■00520260202104741
■006m o d
■007cr#unu||||||||
■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.


