Download or read book Tectonics of the East Pacific Rise 50 to 120S written by David Kenerson Rea and published by . This book was released on 1975 with total page 310 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Tectonics of the East Pacific Rise written by Sang-Mook Lee and published by . This book was released on 1995 with total page 530 pages. Available in PDF, EPUB and Kindle. Book excerpt: The global mid-ocean ridge system is one of the most striking geological features on the surface of the Earth. In this system, the East Pacific Rise (EPR) is the fastest spreading ridge and is thus considered as the most active magmatically among the plate boundaries. In January and February of 1988, an extensive survey by the Massachusetts Institute of Technology and the Woods Hole Oceanographic Institution was conducted along the EPR between 9°05' and 9°55'N to study the crustal structure of the axial region. This thesis, the result of that cruise, comprises four main topics: (1) characterization of normal faulting from Sea Beam bathymetric data, (2) application of mechanical models to explore the hypothesis that buoyancy arising from crustal magma chambers and gravitational spreading of the upper crust are the principal processes leading to the initiation and development of normal faults, (3) investigation of seafloor magnetization anomalies to constrain upper crustal structure, and (4) analysis of gravity anomalies to examine possible correlations between observed variations in seafloor manifestations of volcanism and deformation and underlying structure. Thus, each topic focuses on different levels of the mid-ocean ridge. Together with the results of seismic and other observations, the findings are woven into a better understanding of the tectonic processes and structure of fastspreading mid-ocean ridges.
Download or read book Tectonics of the East Pacific Rise 5 to 12 S written by David Kenerson Rea and published by . This book was released on 1974 with total page 278 pages. Available in PDF, EPUB and Kindle. Book excerpt: The portion of the East Pacific Rise (EPR) between 5° and 12°S can be subdivided into three areas by fracture zones that offset the rise axis at about 6.5°S and 9°S. In all three regions, the spreading axis of the EPR is defined by a topographic block 300 to 350 m high and about 15 km wide. The axial block commonly has subordinate peaks or shoulders on each flank that vary up to 5 km wide. Analysis of linear magnetic anomalies in the southern of the three areas suggests that sea-floor spreading has been occurring at rates of 80 mm/y to the west and 77 mm/y to the east during the last 1.7 million years (my). The rise axis is offset in two places about 10 km. These displacements are interpreted to be the result of discrete jumps of the site of spreading activity. Reconnaissance data from the east flank of the EPR indicate that spreading activity on this portion of the rise began just over 8 my ago when the site of crustal accretion jumped westward from the now dormant Galapagos Rise. About 4.6 my ago the section of rise crest between approximately 10.5°S and the 9°S fracture zone jumped westward a distance of at least 10 km, isolating the pre-existing axial block. By 1.7 my ago, this axial offset no longer existed, implying a relatively westward migration of the rise axis south of 10.5° during the period from 4.6 to 1.7 my ago. The two offsets of the present axis occurred between 1.6 and 0.9 my ago and 0.7 my ago and the present in the north and south, respectively. The formation of the axial block, its associated shoulders and the abyssal topography, apparently consisting of tilted fault blocks with steep sides facing the axis, can be explained by an empirical model. This model combines extrusion of basalt along the spreading axis to form the axial block and rotational faulting to form the shoulders of the block and then lower the shoulders to merge with the abyssal topography of the uppermost rise flanks. In the region north of the 6.5°S fracture zone, seismic activity on the rise crest, combined with topographic information, suggests that the EPR axis is unstable here and that it is in the process of reorienting to a more stable regional trend. Identification and mapping of magnetic anomalies in the vicinity of 6°S reveal a spreading rate of about 77 mm/y, an episode of oblique spreading that occurred 1.7 my ago, and a 10 km westward jump of the axis which occurred since 0.7 my ago. The fracture zone at 6.5°S offsets the EPR axis 55 km right laterally. Both the bathymetric and magnetic expression of this fracture zone are markedly reduced a few tens of kilometers away from its active portion, implying that some change in the processes forming the fracture zone occurred about 0.3 my ago. Between the fracture zones at 6.5° and 9°S, two deactivated segments of the rise axis, each about 40 km long, occur 90 and 65 km west of the currently active axis. These inactive axial segments were isolated by eastward jumps of the spreading center. The more northerly jump, along 6.5°S, occurred 0.3 my ago and spanned 68 km. The other, along 7°S, covered a similar distance and is either just completed or still going on. Reconnaissance data from this part of the EPR suggests that sea-floor spreading began here about 6.5 my ago and has been continuing at a rate of approximately 78 mm/y.
Download or read book East Pacific Rise at 21 N written by Robert D. Ballard and published by . This book was released on 1981 with total page 10 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Tectonic Plates are Moving written by Roy Livermore and published by Oxford University Press. This book was released on 2018-03-08 with total page 528 pages. Available in PDF, EPUB and Kindle. Book excerpt: Plate tectonics is a revolutionary theory on a par with modern genetics. Yet, apart from the frequent use of clichés such as 'tectonic shift' by economists, journalists, and politicians, the science itself is rarely mentioned and poorly understood. This book explains modern plate tectonics in a non-technical manner, showing not only how it accounts for phenomena such as great earthquakes, tsunamis, and volcanic eruptions, but also how it controls conditions at the Earth's surface, including global geography and climate. The book presents the advances that have been made since the establishment of plate tectonics in the 1960s, highlighting, on the 50th anniversary of the theory, the contributions of a small number of scientists who have never been widely recognized for their discoveries. Beginning with the publication of a short article in Nature by Vine and Matthews, the book traces the development of plate tectonics through two generations of the theory. First generation plate tectonics covers the exciting scientific revolution of the 1960s and 1970s, its heroes and its villains. The second generation includes the rapid expansions in sonar, satellite, and seismic technologies during the 1980s and 1990s that provided a truly global view of the plates and their motions, and an appreciation of the role of the plates within the Earth 'system'. The final chapter bring us to the cutting edge of the science, and the latest results from studies using technologies such as seismic tomography and high-pressure mineral physics to probe the deep interior. Ultimately, the book leads to the startling conclusion that, without plate tectonics, the Earth would be as lifeless as Venus.
Download or read book Cenozoic Tectonics and Volcanism of Mexico written by Hugo Delgado-Granados and published by Geological Society of America. This book was released on 2000 with total page 288 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Tectonics and Plate Boundary Processes Along the Southeast Indian Ridge and the East Pacific Rise written by James Andrew Conder and published by . This book was released on 2001 with total page 356 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Physical Geology written by Steven Earle and published by . This book was released on 2016-08-12 with total page 628 pages. Available in PDF, EPUB and Kindle. Book excerpt: This is a discount Black and white version. Some images may be unclear, please see BCCampus website for the digital version.This book was born out of a 2014 meeting of earth science educators representing most of the universities and colleges in British Columbia, and nurtured by a widely shared frustration that many students are not thriving in courses because textbooks have become too expensive for them to buy. But the real inspiration comes from a fascination for the spectacular geology of western Canada and the many decades that the author spent exploring this region along with colleagues, students, family, and friends. My goal has been to provide an accessible and comprehensive guide to the important topics of geology, richly illustrated with examples from western Canada. Although this text is intended to complement a typical first-year course in physical geology, its contents could be applied to numerous other related courses.
Download or read book Tectonics of Mid ocean Ridges written by John Dee Rogers Bicknell and published by . This book was released on 1986 with total page 210 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Ocean of Truth written by Henry William Menard and published by Princeton University Press. This book was released on 2014-07-14 with total page 393 pages. Available in PDF, EPUB and Kindle. Book excerpt: Menard begins with the leading hypotheses (such as that the earth expands) and the supporting evidence for each. He traces the crucial work of the 1960s year by year as researchers debated hypotheses in correspondence and at frequent meetings. Throughout the book Professor Menard considers the implications of his story for the sociology of science and the goals of scientific research. Originally published in 1986. The Princeton Legacy Library uses the latest print-on-demand technology to again make available previously out-of-print books from the distinguished backlist of Princeton University Press. These editions preserve the original texts of these important books while presenting them in durable paperback and hardcover editions. The goal of the Princeton Legacy Library is to vastly increase access to the rich scholarly heritage found in the thousands of books published by Princeton University Press since its founding in 1905.
Download or read book Accessions List written by Environmental Science Information Center. Library and Information Services Division and published by . This book was released on 1981 with total page 96 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Plate Tectonics Crustal Evolution written by Kent C. Condie and published by Elsevier. This book was released on 2013-10-22 with total page 321 pages. Available in PDF, EPUB and Kindle. Book excerpt: Plate Tectonics & Crustal Evolution, Second Edition covers the role of plate tectonics in the geologic past in light of existing geologic evidence, and examples of plate reconstructions. The book discusses the important physical and chemical properties of the crust and upper mantle in terms of models for crustal origin and evolution. The text also describes sea-floor spreading; magma associations; plate tectonics and continental drift. The phanerozoic orogenic systems and the precambrian crustal development are also tackled. The book will be invaluable to students in the earth sciences and to various specialists in the geological sciences.
Download or read book Global Tectonics and Metallogeny written by and published by . This book was released on 1978 with total page 512 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Collected Reprints Atmospheric Physics and Chemistry Laboratory written by Atmospheric Physics and Chemistry Laboratory and published by . This book was released on 1977 with total page 644 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Tectonics written by Eldridge M. Moores and published by Waveland Press. This book was released on 2014-07-23 with total page 427 pages. Available in PDF, EPUB and Kindle. Book excerpt: Deformation of the Earth’s crust happens at a multitude of scales, ranging from submicroscopic to planetary. Tectonics explores structures and processes from regional to global, differentiating itself from the material covered in most structural geology textbooks. Moores and Twiss emphasize basic principles and methodologies of tectonics, embracing the time-honored perspective of using present processes to understand the past. Comprehensive in scope and detail, coverage includes the effects of plate motions and reconstructions and the resultant structures associated with active rift, transform, and subduction boundaries as well as triple junctions and collision zones; deformations of both the ocean basins and the continents; and orogenic belts. Moores and Twiss present tectonics as an open-ended field of study in which assumptions can be challenged and interpretations changed. The authors emphasize the use of models as a means of understanding observations and putting them in context to maintain a distinction between what we know from observing the Earth and what we infer from interpretation.
Download or read book Tectonics of the Pacific Basin and the Circum Pacific Rim written by Horacio Jaime Harrington and published by . This book was released on 1976 with total page 234 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Tectonics of Strike slip Restraining and Releasing Bends written by W. D. Cunningham and published by Geological Society of London. This book was released on 2007 with total page 496 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume addresses the tectonic complexity and diversity of strike-slip restraining and releasing bends with 18 contributions divided into four thematic sections: a topical review of fault bends and their global distribution; bends, sedimentary basins and earthquake hazards; restraining bends, transpressional deformation and basement controls on development; releasing bends, transtensional deformation and fluid flow.
