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 10 of 10 for “"asthenospheric flow"”.
-
The crust and upper mantle structure of eastern Anatolia, Turkey from gravity modeling constrained by seismic data
… underlain by a low-velocity zone associated with asthenospheric flow in the upper mantle. The asthenospheric flow might have been caused by lithospheric delamination and slab detachment. There are many debates about the thickness of the mantle lithosphere, the effect of the hot asthenospheric …
-
Crustal modification by tectonic events and upper mantle anisotropy beneath the Midcontinent Rift and New Madrid Seismic Zone: insights from receiver function studies and teleseismic shear wave splitting
… with vertical magmatic dikes or along-rift flow, rift-orthogonal fast directions from small-scale convection, or reduction in splitting times as a result of vertical asthenospheric flow are not observed, suggesting that the NMSZ is a shallow feature. Shear-wave splitting parameters for the …
-
Melt generation in the Earth's mantle at Convergent Plate Margins
… A geodynamic and petrologic study (Chapter 5) of asthenospheric flow at the margins of thick continental lithosphere reveals small degree melts of the mantle may be responsible for the large negative gradient in seismic wave speed observed at the lithosphere-asthenosphere boundary below eastern …
-
Structure and evolution of the Australian continent : insights from seismic and mechanical heterogeneity and anisotropy
… (vertically coherent deformation or simple asthenospheric flow) quantitatively for the very first time.
-
MANTLE FLOW AND TRANSITION ZONE DISCONTINUITIES BENEATH THE CARRIBEAN PLATE: CONSTRAINTS FROM SHEAR WAVE SPLITTING AND RECEIVER FUNCTION ANALYSES
… used to investigate lithospheric deformation and asthenospheric flow beneath the boundary zone of the North American and Caribbean plates and adjacent areas. A total of 4915 XKS and 1202 pairs of local S wave splitting parameters were obtained at 24 broad band seismic stations. The XKS …
-
Generation of Buried Transient Landscapes and Residual Depth Anomalies
… cannot be reconciled with previous models of asthenospheric flow and lead to revised estimates of plume flux. An exhaustive database of residual depth measurements throughout the Atlantic Ocean is also presented. In particular, newly acquired seismic reflection surveys along the west coast of …
-
A model of the crust and upper mantle structure of the Hellenic and Cyprus subduction zones constrained by gravity and seismic data
… The low-velocity zone is interpreted as asthenospheric material rising up through a slab window (slab-tear) in the subducting African plate. The slab-tear and possible detachment of the subducting African lithosphere from the surface plates are attributed to the differential retreat rates …
-
The primary structures and fabrics of the upper mantle and lower oceanic crust from ophiolite complexes
… D2 shearing events are the remnants of mantle asthenospheric flow at an oceanic spreading centre which have been fossilised into the lithospheric mantle at the asthenosphere-lithosphere boundary. This fossilisation occurs during the offaxis, dominantly horizontal, flow of the asthenosphere. A …
-
Modeling, Visualizing, and Understanding Complex Tectonic Structures on the Surface and in the Sub-Surface
… may bend and shear or tear and open a window for asthenospheric flow.</p> <p>Two different convergent plate boundaries are the primary focus of my studies: the Tonga subduction zone where the Pacific plate moving beneath an island arc is torn along the Samoan Island Archipelago, and the Andean …
-
A Geodynamic Investigation of Continental Rifting and Mantle Rheology: Madagascar and East African Rift case studies
… to: 1) provide a better understanding of mantle flow patterns and themantle rheology beneath Madagascar, 2) to elucidate the main driving forces of observedpresent-day∼E-W opening in the EAR, and 3) to investigate the role of multiple plumesor a superplume in driving surface deformation in the …