Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 20 of 24 for “"sediment thickness"”.
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Global Structure of the Mantle Transition Zone Discontinuities and Site Response Effects in the Atlantic and Gulf Coastal Plain
… correlation between the mantle transition zone thickness and wave speed variations suggests dominantly thermal origins for the lateral variations in the transition zone. The high-resolution global models of the 410- and 660-km discontinuities in this thesis show strong positive correlation …
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Distribution of post-Last Glacial Maximum Sedimentary Deposits in the Amundsen Sea, Antarctica, from Subbottom Seismic Profiles
… the austral summers of 2019 and 2020 reveal sediment that has been delivered from two major glaciers: Thwaites and Pine Island. Sediments transported by Thwaites and Pine Island Glaciers have predominantly been studied through analysis of sediment cores which have been collected in specific …
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Vegetative Response to Hurricane Sedimentation
… macrophyte Spartina alterniflora var. Loisel to sedimentation from Hurricanes Gustav and Ike. A range of sedimentation was used to track the above and belowground plant response, as well as the volume of mineral and organic matter, in the upper reaches of the marsh soil from September 2008 to …
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Subduction dynamics at the middle America trench : new constraints from swath bathymetry, multichannel seismic data, and ¹⁰Be
… radionuclide ¹⁰Be is a unique tracer of shallow sediment subduction in volcanic arcs. The range in ¹⁰Be enrichment in the Central American Volcanic Arc between Guatemala and Costa Rica is not controlled by variations in ¹⁰Be concentrations in subducting sediment seaward of the Middle America …
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The role of denitrification in the nitrogen cycle of New England salt marshes
… contribution of denitrification to salt marsh sediment N cycling. Denitrification in salt marsh tidal creekbottoms is a major sink for groundwater nitrate of terrestrial origin. I studied creekbottom denitrification by direct measurements of N₂ fluxes in closed chambers against a low-N₂ …
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Geology of the passive margin off New England
… in Precambrian/Paleozoic crust. Intra-rift sediments consist of clastics, evaporites, and volcanics. Continental separation occurred and sea-floor spreading began 195-190 my B.P. The boundary between "normal" continental crust and crust radically altered by fracturing and intrusion may be …
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A qualitative and quantitative study of the distribution of pelagic sediment in the Atlantic Basin
Pelagic sedimentation is the primary modifier of topography generated by ridge-associated volcanic and tectonic processes. This thesis represents an effort to understand the processes of, and the general distribution of, pelagic sedimentation on rough topography, particularly in the Atlantic Basin …
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Tectonostratigraphic evolution of the offshore Gippsland Basin, Victoria, Australia: results from 3D seismic interpretation and 2D section restoration, The
… inversion events. Strong tectonic control on the sedimentary development of the basin is reflected in the deposition of several major, basin scale sequences ranging in age from the early Cretaceous to Neogene, which are usually bounded by angular unconformities. Schlumberger's Petrel software …
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Geochemical and sedimentological investigations of Youngest Toba Tuff ashfall deposits
… in particular the mechanisms of transport, sedimentation and preservation of ash deposits. I use distal marine and terrestrial ash sediments: a) to estimate the volume of YTT ash fallout; b) to quantify variability in the geochemistry of YTT ash; c) to assess the reliability of YTT ash as a …
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A qualitative and quantitative study of the distribution of pelagic sediment in the Atlantic Basin
Pelagic sedimentation is the primary modifier of topography generated by ridge-associated volcanic and tectonic processes. This thesis represents an effort to understand the processes of, and the general distribution of, pelagic sedimentation on rough topography, particularly in the Atlantic Basin …
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Intermontane valley fills
Sedimentary valley fills are a widespread characteristic of mountain belts around the world. They transiently store material over time spans ranging from thousands to millions of years and therefore play an important role in modulating the sediment flux from the orogen to the foreland and to …
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Subduction dynamics at the middle America trench : new constraints from swath bathymetry, multichannel seismic data, and 10BE
… radionuclide 10Be is a unique tracer of shallow sediment subduction in volcanic arcs. The range in 10Be enrichment in the Central American Volcanic Arc between Guatemala and Costa Rica is not controlled by variations in 10Be concentrations in subducting sediment seaward of the Middle America …
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The role of denitrification in the nitrogen cycle of New England salt marshes
… contribution of denitrification to salt marsh sediment N cycling. Denitrification in salt marsh tidal creekbottoms is a major sink for groundwater nitrate of terrestrial origin. I studied creekbottom denitrification by direct measurements of N2 fluxes in closed chambers against a low-N2 …
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Cenozoic stratigraphic and tectonic history of the Grenada and Tobago basins as determined from marine seismic data, wells, and onland geology
… seismic facies, and similar Paleogene sediment thickness suggest that the two basins formed as a single, Paleogene forearc basin related to the now dormant Aves Ridge. This single forearc basin continued to open through flexural subsidence during the early to middle Eocene probably …
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Identifying source rocks and reservoir elements of South China Sea grabens using 3D seismic data, West Natuna Basin, Indonesia
… a classic, tectonically-influenced, half graben sedimentary fill in the West Natuna rift (Schlische & Olsen, 1990; Schlische, 1993; Gawthorpe & Leeder, 2000; Lambiase et al., 1999). Half grabens evolve in four stages; fault initiation, fault linkage, through-going fault, and fault death stages. …
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Evolution of Late Cenozoic Minibasins and Growth Faulting, Green Canyon Area, Northwestern Gulf of Mexico
… seismic profiles indicates that high rates of sedimentation during the Pliocene and Pleistocene likely caused mobilization and complete evacuation of an allochthonous Miocene salt sheet. This movement is interpreted to have caused the formation of minibasins overlying the salt and many …
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1D shallow sedimentary subsurface imaging using ambient noise and active seismic data
The Earth’s shallow subsurface with sedimentary cover acts as a waveguide to any incoming wavefield. Within the framework of my thesis, I focused on the characterization of this shallow subsurface within tens to few hundreds of meters of sediment cover. I imaged the seismic 1D shear wave velocity …
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INTEGRATING GEOPHYSICAL METHODS TO STUDY SUBDUCTION ZONE PROPERTIES, ACTIVE FAULTING IN A VOLCANIC FIELD, AND VOLCANO LANDSLIDE HAZARDS
… state, I illuminate the location, structure, and sediment velocity of an anomalously quiet plate boundary, utilizing the long offset data to improve estimates of sediment velocity. The resulting velocity model indicates that there is a high velocity basal sedimentary unit on the megathrust plate …
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Modelling Viscous Flow and Elastic Deformation in Fold-Thrust Belts and Magmatic Intrusions
… at convergent margins, where accretion of weak sediments to the front of the overriding plate results in continued flexural subsidence of the underthrusting plate. In this dissertation I build a new dynamic model to investigate both the role of the thickness and material properties of the …
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Seismic Investigation on Temporal Structural Changes and Joint Inversion of Sedimentary and Crustal Structure Beneath North China
… of earthquake prone regions in China. Knowing sedimentary structure within a basin is of great importance to predict strong ground motions caused by earthquakes. We employ two different methods to image the shallow sedimentary structure for the Bohai Bay Basin and other basins located within …
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