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DTIC ADA472608: Seismic and Gravitational Studies of Melting in the... |
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by Defense Technical Information Center |
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This thesis presents three studies which apply |
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geophysical tools to the task of better understanding |
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mantle melting phenomena at the upper and lower |
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boundaries of the mantle. The first study uses seafloor |
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bathymetry and small variations in the gravitational |
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acceleration over the Hawaii-Emperor seamount chain to |
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constrain the changes in the igneous production of the |
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hot spot melting in the mantle which has created these |
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structures over the past 80 My. The second study uses |
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multichannel seismic reflection data to constrain the |
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location and depth of axial magma chambers at the |
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Endeavour Segment of the Juan de Fuca spreading ridge, |
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and then correlates these magma chamber locations with |
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features of the hydrothermal heat extraction system in |
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the upper crust such as microseismicity caused by thermal |
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cracking and high temperature hydrothermal vent systems |
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observed on the seafloor. The third study uses two- |
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dimensional global pseudospectral seismic wave |
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propagation modeling to characterize the sensitivity of |
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the SPdKS seismic phase to two-dimensional, finite-width |
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ultra-low velocity zones (ULVZs) at the core-mantle |
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boundary. Together these three studies highlight the |
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dynamic complexities of melting in the mantle while |
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offering new tools to understand that complexity. |
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Date Published: 2018-06-14 04:52:31 |
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Identifier: DTIC_ADA472608 |
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Item Size: 222000126 |
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Language: english |
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Media Type: texts |
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# Topics |
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DTIC Archive; Van Ark, Emily M ; WOOD... |
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