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Seismic Investigations Of The Crust And Upper Mantle Structure In Antarctica And Madagascar
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Book Synopsis Seismic Investigations of the Crust and Upper Mantle Structure in Antarctica and Madagascar by : Cristo Ramirez
Download or read book Seismic Investigations of the Crust and Upper Mantle Structure in Antarctica and Madagascar written by Cristo Ramirez and published by . This book was released on 2017 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: In the three studies that form this dissertation, seismic data from Antarctica and Madagascar have been analyzed to obtain new insights into crustal structure and mantle flow. Until recently, there have been little seismic data available from these areas for interrogating Earth structure and processes. In Antarctica, I analyzed datasets from temporary deployments of broadband seismic stations in both East and West Antarctica. In Madagascar, I analyzed data from a temporary network of broadband stations, along with data from three permanent stations. The seismic data have been processed and modeled using a wide range of techniques to characterize crust and mantle structure. Crustal structure in the East Antarctic Craton resembles Precambrian terrains around the world in its thickness and shear wave velocities. The West Antarctic Rift System has thinner crust, consistent with crustal thickness beneath other Cretaceous rifts. The Transantarctic Mountains show thickening of the crust from the costal regions towards the interior of the mountain range, and high velocities in the lower crust at several locations, possibly resulting from the Ferrar magmatic event. Ross Island and Marie Byrd Land Dome have elevated crustal Vp/Vs ratios, suggesting the presence of partial melt and/or volcaniclastic material within the crust. The pattern of seismic anisotropy in Madagascar is complex and cannot arise solely due to mantle flow from the African superplume, as previously proposed. To explain the complex pattern of anisotropy, a combination of mechanisms needs to be invoked, including mantle flow from the African superplume, mantle flow from the Comoros hotspot, small scale upwelling in the mantle induced by lithospheric delamination, and fossil anisotropy in the lithospheric mantle along Precambrian shear zones.
Book Synopsis The Structure of the Earth's Crust by : Stephan Mueller
Download or read book The Structure of the Earth's Crust written by Stephan Mueller and published by Elsevier. This book was released on 2013-10-22 with total page 379 pages. Available in PDF, EPUB and Kindle. Book excerpt: Developments in Geotectonics 8: The Structure of the Earth's Crust Based on Seismic Data covers the papers presented at an International Upper Mantle Committee (lUMC) symposium called ""Crustal Structure Based on Seismic Data"", held on July 30-31, 1971. The book focuses on the structure, composition, and characteristics of the earth's crust. The selection first offers information on the crustal structure of Central and Southeastern Europe by data of explosion seismology; structure of the earth's crust on the territory of the U.S.S.R.; and seismic studies of low-velocity layers and horizontal inhomogeneities within the crust and upper mantle on the territory of the U.S.S.R. The text also takes a look at the deep seismic investigations in the Baikal rift zone and crust of the arctic seas of Eurasia. Discussions focus on peculiarities of crustal structure, structure of the uppermost mantle, and method of investigation. The publication takes a look at the crustal structure of Japan as derived from explosion seismic data; crustal structure in the Matsushiro earthquake swarm area; and Soviet seismic studies of the earth's crust in the Pacific Ocean during the International Upper Mantle Project. The selection is a dependable source of information for readers interested in the structure of the earth's crust.
Book Synopsis The Earth's Crust and Upper Mantle by : Pembroke J. Hart
Download or read book The Earth's Crust and Upper Mantle written by Pembroke J. Hart and published by American Geophysical Union. This book was released on 1969 with total page 801 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Crust and Upper Mantle Structure of West Antarctica from a Sparse Seismic Array by : Tongjun Cho
Download or read book Crust and Upper Mantle Structure of West Antarctica from a Sparse Seismic Array written by Tongjun Cho and published by . This book was released on 2006 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Seismic Array Studies of Antarctica and Madagascar by : Martin James Pratt
Download or read book Seismic Array Studies of Antarctica and Madagascar written by Martin James Pratt and published by . This book was released on 2016 with total page 161 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis The Structure of the Earth's Crust and Upper Mantle from the Data of Seismic Investigations by :
Download or read book The Structure of the Earth's Crust and Upper Mantle from the Data of Seismic Investigations written by and published by . This book was released on 1977 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis The Earth's Crust and Mantle by : Raisa Mikhaĭlovna Demenit︠s︡kai︠a︡
Download or read book The Earth's Crust and Mantle written by Raisa Mikhaĭlovna Demenit︠s︡kai︠a︡ and published by . This book was released on 1970 with total page 218 pages. Available in PDF, EPUB and Kindle. Book excerpt: The translation is a summary of complex data on the earth's crust and upper mantle. In the examination of the data on the various regions of the terrestrial globe (characteristics of the gravity, magnetic, seismic, thermal and electric fields of the earth) and the comparison between them and the structure of the crust, the author reveals the specific features of the different geological structures and determines the diagnostic significance of the geophysical data. Much attention is given to the crustal structure of the oceanic areas. A description of the general characteristics of the relief and the physical properties of the upper mantle is given in the last section of the book, where the physical map of the upper mantle is given in the last section of the book, where the physical map of the upper mantle is presented. In conclusion, a review is given of the projects of ultradeep scientific boring in the Pacific ocean, territory of the USSR, Japan and Canada. (Author).
Book Synopsis Mantle Structure and Seismicity of Antarctica by : Erica Lucas
Download or read book Mantle Structure and Seismicity of Antarctica written by Erica Lucas and published by . This book was released on 2022 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this dissertation, I investigate upper mantle structure and characterize seismicity in Antarctica using data recorded on broadband seismic stations over more than two decades. My investigations of upper mantle structure address outstanding questions about the tectonic history and neotectonic setting of Antarctica, and my investigations of seismicity advance our understanding of modern glacial, tectonic, and volcanic processes in West Antarctica. In Chapter 2, shear wave splitting measurements are used to examine mantle anisotropy across Antarctica. Largely northeast -- southwest oriented fast polarization directions observed across much of the continent likely arise from regionally variable contributions of both lithospheric and sublithospheric fabrics. Lithospheric fabrics are best associated with Precambrian tectonism in East Antarctica and Jurassic -- Cenozoic tectonic activity elsewhere on the continent. Sub-lithospheric mantle fabrics can be attributed to either plate motion-induced asthenospheric flow or small-scale convection regimes. New P- and S-wave velocity models of the upper mantle beneath central West Antarctica are presented in Chapter 3. The models show significant heterogeneity in upper mantle structure throughout the region. High velocity anomalies imaged throughout the central portion of the West Antarctic Rift System are consistent with lithosphere unmodified by tectonic activity since the late Cretaceous to early Cenozoic formation of the rift system, while localized low velocity anomalies are suggestive of focused Cenozoic rifting. A low velocity anomaly imaged beneath the Pine Island Glacier and the mouth of the Thwaites Glacier is interpreted as a rift-related thermal structure that may include warm mantle flowing from Marie Byrd Land. The heterogenous upper mantle velocity structure imaged in Chapter 3 indicates that upper mantle temperatures beneath central West Antarctica could vary by 100 K or more over distances of 100 km or less, suggestive of significant lateral variability in upper mantle viscosity throughout the region. In Chapter 4, I locate 117 previously undetected seismic events originating from glacial, tectonic, volcanic processes in central West Antarctica. Seismicity is clustered in four geographic regions, including the Ellsworth Mountains, Thwaites Glacier, Pine Island Glacier, and Mount Takahe. Using Pn-wave travel times from select seismic events, fast uppermost mantle velocities are imaged throughout central West Antarctica, consistent with the presence of a tectonically stable mantle lid. A study on repeating glacial seismicity at the Foundation Ice Stream in West Antarctica is presented in Chapter 5. Two clusters of seismicity are observed at the Foundation Ice Stream, one located near the grounding line and second further upstream. Seismicity at the grounding line shows clear tidal modulation, with seismic events primarily occurring during spring tide and, more specifically, concurrent with rising tide preceding daily maximum high tide. The second cluster of seismicity is located upstream Foundation Ice Stream near a prominent subglacial ridge, and the observed events most likely reflect basal stick-slip processes associated with the topographic high.
Book Synopsis Structure of the Earth's Crust and Upper Mantle Plotted from the Data of Seismic Studies by :
Download or read book Structure of the Earth's Crust and Upper Mantle Plotted from the Data of Seismic Studies written by and published by . This book was released on 1978 with total page 610 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Upper Mantle written by A. R. Ritsema and published by Elsevier. This book was released on 2013-10-22 with total page 657 pages. Available in PDF, EPUB and Kindle. Book excerpt: Developments in Geotectonics, 4: The Upper Mantle focuses on the upper mantle and its influence on the development of the earth's crust, including history of the moon and other planets and volcanology. The selection first offers information on the origin of the earth, including ideas on the formation process of the terrestrial planets, condensation of dust particles, nature of the earth's core, thermal history of the earth, and fractionation of iron in the terrestrial planets. The text then ponders on the beginning of continental evolution, as well as the oldest rocks of the earth's crust, thermal history of the moon, and early history of the other planets. The text elaborates on magmatic activity as the major process in the chemical evolution of the earth's crust and mantle; trends in the evolution of continents; progress and problems in volcanology; and pressure and temperature conditions and tectonic significance of regional and ocean-floor metamorphism. The manuscript also takes a look at the state of mantle minerals, melting temperatures in the earth's mantle, and geomagnetic induction studies and the electrical state of the upper mantle. The publication is a dependable reference for readers interested in the study of the upper mantle.
Author :International Council of Scientific Unions. International Geophysical Committee. Working Group on the Upper Mantle Project Publisher : ISBN 13 : Total Pages :68 pages Book Rating :4.:/5 (7 download)
Book Synopsis Investigations of the Earth's Crust by : International Council of Scientific Unions. International Geophysical Committee. Working Group on the Upper Mantle Project
Download or read book Investigations of the Earth's Crust written by International Council of Scientific Unions. International Geophysical Committee. Working Group on the Upper Mantle Project and published by . This book was released on 1962 with total page 68 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis The Earth's Crust and Upper Mantle by : Pembroke J. Hart
Download or read book The Earth's Crust and Upper Mantle written by Pembroke J. Hart and published by . This book was released on 1971 with total page 735 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Determining the Upper Mantle Seismic Structure Beneath the Northern Transantarctic Mountains, Antarctica, Form Regional P- and S-wave Tomography by : Gregory Brenn
Download or read book Determining the Upper Mantle Seismic Structure Beneath the Northern Transantarctic Mountains, Antarctica, Form Regional P- and S-wave Tomography written by Gregory Brenn and published by . This book was released on 2016 with total page 94 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Synthesis of Regional Crust and Upper-mantle Structure from Seismic and Gravity Data by : Shelton S. Alexander
Download or read book Synthesis of Regional Crust and Upper-mantle Structure from Seismic and Gravity Data written by Shelton S. Alexander and published by . This book was released on 1982 with total page 85 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Structure of the Earth's Upper Mantle from Long-period Seismic Data by : Robert Lee Woodward
Download or read book Structure of the Earth's Upper Mantle from Long-period Seismic Data written by Robert Lee Woodward and published by . This book was released on 1989 with total page 338 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Seismic Structure of the Crust and Upper Mantle Under North America and the Pacific Ocean by : Stephen C. Blair
Download or read book Seismic Structure of the Crust and Upper Mantle Under North America and the Pacific Ocean written by Stephen C. Blair and published by . This book was released on 1980 with total page 128 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis The Earth's Crust and the Upper Mantle of the Continents by : Vladimir Vladimirovich Belousov
Download or read book The Earth's Crust and the Upper Mantle of the Continents written by Vladimir Vladimirovich Belousov and published by . This book was released on 1965 with total page 184 pages. Available in PDF, EPUB and Kindle. Book excerpt:
