NTUGeo

理學院

臺大

週二, 09 一月 2007 10:08

Deep Earth

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Seismic energy excited by millions of earthquakes denoted by circles is a powerful tool to probe the interior of the earth like X-rays used for CAT scan of a human body.  Lately the traditional thinking of a finite-frequency seismic wave as a light ray such as P, PP and PcP phases (a) has been mended to account for its realistic 3-D banana-shaped sensitivity (b).  This new theory yields significantly-improved tomographic images which reveal a variety of mantle plumes in the mantle.
  • Portrayal of anisotropic fabrics and deformation states in the young Pacific oceanic lithosphere and the Ryukyu subduction-backarc environments as inferred from the observation of seismic polarization anisotropy, specifically shear-wave splitting analysis (S.H. Hung)
  • Mapping lateral variations in the topography of upper mantle seismic discontinuities and the transition zone velocity structure beneath Taiwan and the surrounding region by means of receiver functions and triplication arrivals (S.H. Hung)
  • Determination of robust P and S velocity structures beneath the Iceland hotspot through joint-inversion of multi-frequency seismic travel-time data interpreted by advanced banana-doughnut theory (S.H. Hung)
  • Exploration of the remote heterogeneous “D” layer near the core-mantle boundary as revealed by shear velocity variations varying from a global scale to a highlighted region under the Caribbean and Central America (S.H. Hung)
  • Probing the root of hotspots and a variety of mantle plumes as revealed by a whole-mantle P-velocity anomaly derived from finite-frequency travel-time tomography (S.H. Hung)
  • Illumination of global seismic anisotropic pattern and the thickness of continents constrained by normal-mode waveform tomography (Y. Gung)
  • Construction of global attenuation (Q) structure in the anelastic upper mantle (Y. Gung)
  • Seismic imaging of superplumes from the bottom to the top of the mantle as an implication for heat flux and the thermal evolution within the earth (Y. Gung)
  • Proposition of a mantle plume initiation model for the formation of the Emeishan LIP as designated by geochemical survey (S.L. Chung and C.H. Lo)
  • Characterization of the magmatism and its significance on the tectonic evolution in diverse collisionalenvironments, including the Tibetan plateau, SE Asia, East China, and the Ryukyu-Okinawa subduction-backarc setting (S.L. Chung and C.H. Lo)
    Field work in Tibet.

Seismic energy excited by millions of earthquakes denoted by circles is a powerful tool to probe the interior of the earth like X-rays used for CAT scan of a human body.  Lately the traditional thinking of a finite-frequency seismic wave as a light ray such as P, PP and PcP phases (a) has been mended to account for its realistic 3-D banana-shaped sensitivity (b).  This new theory yields significantly-improved tomographic images which reveal a variety of mantle plumes in the mantle.
  • Portrayal of anisotropic fabrics and deformation states in the young Pacific oceanic lithosphere and the Ryukyu subduction-backarc environments as inferred from the observation of seismic polarization anisotropy, specifically shear-wave splitting analysis (S.H. Hung)
  • Mapping lateral variations in the topography of upper mantle seismic discontinuities and the transition zone velocity structure beneath Taiwan and the surrounding region by means of receiver functions and triplication arrivals (S.H. Hung)
  • Determination of robust P and S velocity structures beneath the Iceland hotspot through joint-inversion of multi-frequency seismic travel-time data interpreted by advanced banana-doughnut theory (S.H. Hung)
  • Exploration of the remote heterogeneous “D” layer near the core-mantle boundary as revealed by shear velocity variations varying from a global scale to a highlighted region under the Caribbean and Central America (S.H. Hung)
  • Probing the root of hotspots and a variety of mantle plumes as revealed by a whole-mantle P-velocity anomaly derived from finite-frequency travel-time tomography (S.H. Hung)
  • Illumination of global seismic anisotropic pattern and the thickness of continents constrained by normal-mode waveform tomography (Y. Gung)
  • Construction of global attenuation (Q) structure in the anelastic upper mantle (Y. Gung)
  • Seismic imaging of superplumes from the bottom to the top of the mantle as an implication for heat flux and the thermal evolution within the earth (Y. Gung)
  • Proposition of a mantle plume initiation model for the formation of the Emeishan LIP as designated by geochemical survey (S.L. Chung and C.H. Lo)
  • Characterization of the magmatism and its significance on the tectonic evolution in diverse collisionalenvironments, including the Tibetan plateau, SE Asia, East China, and the Ryukyu-Okinawa subduction-backarc setting (S.L. Chung and C.H. Lo)
    Field work in Tibet.

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