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.
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Showing 1 to 20 of 75 for “"Crustal structure."”.
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Crustal structure from teleseismic bodywave data
Thesis (Sc.D.)--Massachusetts Institute of Technology, Dept. of Earth, Atmospheric, and Planetary Sciences, 1990.
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THE SEDIMENT AND CRUSTAL STRUCTURE OF THE SOUTHEASTERN UNITED STATES
… enable detailed imaging of lithospheric structure, but suffer from contamination in sedimented regions. Therefore, I implement a method for constraining average crustal thickness and seismic velocities while correcting for the effects of sediments. I then use high-frequency constraints on …
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Crustal Structure of the Middle Mariana Arc-Back-Arc System
Die kontinentale Kruste prägt unseren Planeten, doch ihre Entstehung ist bis heute umstritten. Intraozeanische Inselbögen gelten als Schlüsselbereich, da sie über Subduktionszonen neue Kruste erzeugen und basaltische ozeanische Lithosphäre in kontinentalähnliche Zusammensetzungen umwandeln. Die …
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The crustal structure and subsidence history of aseismic ridges and mid-plate island chains
… three papers examining problems related to the crustal structure, isostasy and subsidence history of aseismic ridges and mid-plate island chains. Analysis of gravity and bathymetry data across the Ninetyeast and eastern Walvis Ridges indicates these features are locally compensated by an over …
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Crustal structure of rifted and convergent margins : the U.S. East Coast and Aleutian margins
… acquired the necessary intrumentation to image crustal structure across margins in detail. In this thesis we investigate the crustal structure across the U.S. East Coast rifted margin and the convergent margin of southwestern Alaska using modern, deep-penetrating marine seismic …
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Receiver function studies of crustal structure, composition, and evolution beneath the Afar Depression, Ethiopia
… Geophysics group at Missouri S&T to characterize crustal properties beneath the Afar Depression in Ethiopia where extensional tectonics dominates. In this study, measurements of crustal thickness (H), crustal mean Vp/Vs [which is related to Poisson's ratio (Σ)], and the sharpness of the Moho (R) …
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Ps receiver function imaging of crustal structure and Moho topography beneath the Northeast Caribbean.
The Caribbean plate consists of accreted different geologic terrains bounded by a system of complex plate boundaries. We conduct P-to-S receiver function studies of the Northeast Caribbean in order to image the plate boundary and study the major forces driving tectonics and strain distribution in …
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The crustal structure and subsidence history of aseismic ridges and mid-plate island chains
Thesis. 1978. Ph.D.--Massachusetts Institute of Technology. Dept. of Earth and Planetary Science.
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Crustal structure of rifted and convergent margins : the U.S. east coast and Aleutian margins
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Earth, Atmospheric, and Planetary Sciences, 1997.
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The evolution of lithospheric deformation and crustal structure from continental margins to oceanic spreading centers
… the evolution of lithospheric deformation and crustal structure from continental margins to mid-ocean ridges. The first part (Ch. 2) examines the style of segmentation along the U.S. East Coast Margin and investigates the relationship between incipient margin structure and segmentation at the …
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Crustal structure and evolution beneath the Colorado Plateau and the southern basin and range province
… revealed systematic spatial variations in crustal Vp/Vs, crustal thickness and amplitude of P-to-S converted phases. Our results reveal that the BRP is characterized by a thin crust (28.2 ± 0.5 km), a mean Vp/Vs of 1.761 ± 0.014 and a mean amplitude (R) of P - to - S converted wave …
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The evolution of lithospheric deformation and crustal structure from continental margins to oceanic spreading centers
… the evolution of lithospheric deformation and crustal structure from continental margins to mid-ocean ridges. The first part (Ch. 2) examines the style of segmentation along the U.S. East Coast Margin and investigates the relationship between incipient margin structure and segmentation at the …
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Receiver function investigations of mantle transition zone and crustal structure in East Africa and Northeast Asia
… conducted in East Africa and Northeast Asia, the structure and evolution of the crust, upper mantle, and the mantle transition zone (MTZ) are still controversial. The MTZ discontinuities beneath the study area are imaged by stacking an unprecedented volume of receiver functions (RFs). The normal …
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Joint modeling receiver functions and autocorrelograms to estimate crustal structure in the presence of deep sediments.
… use large, distant earthquakes to image local structure. They record the interactions of teleseismic P waves with impedance contrasts, such as the Moho and sediment-basement interface, which generate conversions of P type to S type energy. Typically, receiver functions are used to determine …
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Seismic Investigation on Temporal Structural Changes and Joint Inversion of Sedimentary and Crustal Structure Beneath North China
… as accurate imaging of the evolving subsurface structure has significant applications in disaster reduction, resource exploration, and environmental monitoring. One particularly interesting area to seismologists is monitoring the time-varying stress field associated with major earthquakes and …
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Crustal structure of the Eratosthenes Seamount, Cyprus and S. Turkey from an amphibian wide-angle seismic profile
… lower than 6.5 km/s in the crust, (2) a variable crustal thickness of about 28 - 37 km and (3) an upper crustal reflection at 5 km depth beneath the ESM. Two land shots on Turkey, also recorded on Cyprus, airgun shots south of Cyprus and geological and previous seismic investigations provide the …
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Crustal structure beneath hi-climb seismic array in western Tibetan plateau from a generalized H-κ method
… H and κ of the crust globally. Accurate crustal thickness (H) and average crustal Vp/Vs ratio (κ) are essential for understanding the tectonic setting and other fundamental geological questions. However, the traditional H-κ method may provide some questionable results in regions where …
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Crustal structure and tectonics of Borneo and Sulawesi: results from receiver function analysis and virtual deep seismic sounding
… seismic networks to image the first order crustal structure of both Borneo and Sulawesi. This will provide fresh insight into their deep structure, provenance and tectonic evolution, and how they have been impacted by recent events (e.g. opening of the South China Sea) that have clearly …
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Judging a planet by its cover : insights into lunar crustal structure and Martian climate history from surface features
… can yield information about deeper planetary structure and history. In this thesis, I use data sets from four orbital robotic spacecraft missions to answer longstanding questions about the crustal structure of the Moon and the climatic history of Mars. In chapter 2, I use gravity data from the …
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