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 429 for “"Rift"”.
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Investigating volcano tectonic interactions in the Natron Rift of the East African Rift System
Continental rifting, like other plate tectonic processes, plays a large role in shaping the Earth's crust. Active rift zones evolve from repeated tectonic and magmatic events including volcanic activity. Through investigations of currently and previously active rifts, scientists have discovered …
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Tectonic evolution of the Corinth Rift
… of extensional processes at continental rift zones provides important constraints on the underlying lithospheric deformation mechanisms, level of seismic hazard and location of likely hydrocarbon traps. The Corinth rift in central Greece is one of the few examples that has experienced a …
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Tectonic model of the Malaŵi Rift, Africa
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Earth, Atmospheric and Planetary Sciences, 1986.
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Host response to Rift Valley fever virus infection
Rift Valley fever virus (RVFV) has the ability to cause severe disease (in the form of encephalitis or hemorrhagic fever) in humans and animals. RVFV is endemic to parts of Africa and the Arabian Peninsula, but there is significant concern regarding its potential introduction into non-endemic …
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Explosive Volcanism in the Kenyan Rift: A Tephrostratigraphic Perspective
… is that tephrostratigraphic frameworks in the rift valley are patchy, focus mainly on the earlymid Pleistocene and the sources of volcanic deposits are rarely defined, leaving recent volcanic histories incomplete and poorly dated or correlated. Lake sediment records offer an opportunity to …
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Pre-rift evolution of Malawian high-grade basement rocks
… events. This thesis provides a more detailed pre-rift evolution of the Malawian basement rocks by reporting ages and P-T conditions from four localities surrounding Lake Malawi, namely Chilumba, Mlowe, Maganga, and Mangochi. Results reveal that at 1985-1974 Ma, garnet-cordierite granulites were …
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Refraction of isotherms: applications to define rift basin geometry
… steady-state heat conduction, three models of rift basins with various fault attitudes (vertical, high-angle, and listric) and a thermal conductivity ratio of 1:2, basin material:country rock, are analyzed numerically using the computer program CCC which utilizes the Integrated Finite …
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STRUCTURAL EVOLUTION OF THE RIO GRANDE RIFT: SYNCHRONOUS EXHUMATION OF RIFT FLANKS FROM 20-10 MA, EMBRYONIC CORE COMPLEXES, AND FLUID-ENHANCED QUATERNARY EXTENSION
The Rio Grande rift in Colorado and New Mexico is one of the well-exposed and well-studied continental rifts in the world. Interest in the rift is driven not only by pure scientific intrigue, but also by a desire and a necessity to quantify earthquake hazards in New Mexico as well as to assess …
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Thermal and mechanical development of the East African Rift System
… flanks, and volcanoes of the Western and Kenya rift systems have developed along the western and eastern margins of the 1300 km-wide East African plateau. Structural patterns deduced from field, Landsat, and geophysical studies in the Western rift reveal a series of asymmetric basins bounded by …
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GEOCHEMISTRY OF LARGE EXPLOSIVE ERUPTIONS FROM THE MAIN ETHIOPIAN RIFT
The Main Ethiopian Rift (MER) is located in a geodynamic setting controlled by continental spreading, which has occurred since Eocene-Oligocene. In this area, the active tectonics has repeatedly favoured magma ascent along the rift axis resulting in intense volcanic activity characterized by a wide …
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Thermal and mechanical development of the East African Rift System
… flanks, and volcanoes of the Western and Kenya rift systems have developed along the western and eastern margins of the 1300 km-wide East African plateau. Structural patterns deduced from field, Landsat, and geophysical studies in the Western rift reveal a series of asymmetric basins bounded by …
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The development of novel diagnostic countermeasures for Rift Valley fever virus
Rift Valley fever virus (RVFV) is a zoonotic arbovirus that is a significant threat to livestock and humans. It is listed as #3 for most dangerous animal threats and is in the top 10 pathogens needing urgent research in preventative and control measures. Although RVFV has never been reported in the …
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Investigating the mechanism of RNA packaging in Rift Valley Fever phlebovirus
Rift Valley fever phlebovirus (RVFV) is a trisegmented, single-stranded, negative-sense RNA genome, consisting of L, M and S segments. The virion carries two envelope glycoproteins, Gn and Gc, along with ribonucleoprotein complexes (RNPs), composed of encapsidated genomes carrying the nucleocapsid …
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STRATIGRAPHIC FRAMEWORK AND QUATERNARY PALEOLIMNOLOGY OF THE LAKE TURKANA RIFT, KENYA
… lake in the Eastern Branch of the East African Rift System. It is situated at ~2 °N at 360 m elevation and is ~250 km long and ~30 km wide with a mean depth of 35 m. The lake surface receives less than 200 mm yr-1 of rainfall during the twice-annual passing of the Intertropical Convergence Zone …
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Denudation processes in a tectonically active rift on different time scales
Continental rifts are excellent regions where the interplay between extension, the build-up of topography, erosion and sedimentation can be evaluated in the context of landscape evolution. Rift basins also constitute important archives that potentially record the evolution and migration of species …
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Incipient continental rifting: insights from the Okavango Rift Zone, northwestern Botswana
… Model (SRTM DEM) data from the Okavango Rift Zone in northwest Botswana are used to map the distribution of rift and basement structures. The distribution of these structures provide useful insights into the early stages of continental rifting. The objectives of this study are (1) …
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Facies and provenance analysis of the Midcontinent Rift System (MRS) in Kansas
The Midcontinent Rift System (MRS) formed a half-graben that extends into NE Kansas. The Precambrian rift succession, penetrated by Texaco Noel Poersch#1 (NP#1) well in Washington Co. at depths between 2846 and 11300 ft, comprises two successions. The lower one (11300-7429 ft) is dominated by …
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Collisional Reactivation of Rift Margin Fracture Zones, Taiwan and the Taconic Allochthon
<p><strong>Chapter I. Transverse Topographic Development due to the Reactivation of a Partially-Subducted Fracture Zone: The Southwest Hsüehshan Range, Central Taiwan</strong></p> <p><strong><em>Abstract — </em></strong>The southwest flank of the Hsüehshan Range is defined by a topographic break …
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Manipulation of the Rift Valley Fever Virus M-Segment for Vaccine Development
Rift Valley fever virus (RVFV) is a phlebovirus of the virus family, Bunyaviridae. Since the early 1900s, RVFV has continually caused economically devastating outbreaks in livestock and severe disease in humans. In pregnant ewes, RVFV infection can cause abortions in up to 100% of animals and high …
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Hydrography and flow in the rift valley of the Mid-Atlantic Ridge
… Ridge are characterized by deep axial rift valleys which are isolated from the water on the ridge flanks. Topographic effects therefore have a significant impact on the rift-valley hydrography and dynamics but little is known about the details. Known processes of global importance …
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