Download or read book Pressure and Gravity Effects on the Simulation of Meteorite Impact Craters written by Jerry Alan Smith and published by . This book was released on 1967 with total page 158 pages. Available in PDF, EPUB and Kindle. Book excerpt: Meteorite impact craters were simulated by detonation of chemical explosives in a cohesionless medium at various air pressures (0.0005 mm Hg to 1000 mm Hg) and at four gravity conditions (0.17 g, 0.38 g, 1.0 g, and 2.5 g). Crater parameters (diameter and depth) were measured to determine the effects of pressure and gravity on the cratering process. Lip height was measured only in the pressure work. Diameter and depth increased approximately 12% and 10% respectively with decreasing pressure while lip height remained relatively constant. Crater diameter decreased from a mean value of 47.9 cm at 0.17 g to 33.7 cm at 2.5 g. Depth did not vary appreciably from 1.0 g to 2.5 g (7.7 cm to 5.7 cm). A scaling equation was derived to relate crater diameter, pressure, gravity, and energy in a cohesionless medium within the pressure range of 300 mm Hg to 1000 mm Hg and the gravity range of 0.17 g to 2.5 g. To obtain additional information on the mechanics of crater formation, craters were formed in mediums with horizontal layering. Scouring and compaction were found to be predominant processes in both the pressure and gravity phases. (Author).
Download or read book Large Meteorite Impacts III written by Thomas Kenkmann and published by Geological Society of America. This book was released on 2005-01-01 with total page 486 pages. Available in PDF, EPUB and Kindle. Book excerpt: "The third volume of the series “Large Meteorite Impacts” provides an updated and comprehensive overview of modern impact crater research. In 26 chapters, more than 90 authors from Europe, the United States, Russia, Canada, and South Africa give a balanced, firsthand account of the multidisciplinary field of cratering science, with reports on field studies, geophysical analyses, and experimental and numerical simulations. Nine chapters focus on structure, geophysics, and cratering motions of terrestrial craters. Recent advances in impact ejecta studies and shock metamorphism are assembled, each with seven chapters, and three chapters extend the scope from a terrestrial to a planetary perspective."--pub. desc.
Download or read book Impact Cratering written by G. R. Osinski and published by John Wiley & Sons. This book was released on 2012-12-26 with total page 362 pages. Available in PDF, EPUB and Kindle. Book excerpt: Impact cratering is arguably the most ubiquitous geological process in the Solar System. It has played an important role in Earth’s history, shaping the geological landscape, affecting the evolution of life, and generating economic resources. However, it was only in the latter half of the 20th century that the importance of impact cratering as a geological process was recognized and only during the past couple of decades that the study of meteorite impact structures has moved into the mainstream. This book seeks to fill a critical gap in the literature by providing an overview text covering broad aspects of the impact cratering process and aimed at graduate students, professionals and researchers alike. It introduces readers to the threat and nature of impactors, the impact cratering process, the products, and the effects – both destructive and beneficial. A series of chapters on the various techniques used to study impact craters provide a foundation for anyone studying impact craters for the first time.
Download or read book Large Meteorite Impacts and Planetary Evolution VI written by Wolf Uwe Reimold and published by Geological Society of America. This book was released on 2021-09-23 with total page 644 pages. Available in PDF, EPUB and Kindle. Book excerpt: "This volume contains a sizable suite of contributions dealing with regional impact records (Australia, Sweden), impact craters and impactites, early Archean impacts and geophysical characteristics of impact structures, shock metamorphic investigations, post-impact hydrothermalism, and structural geology and morphometry of impact structures - on Earth and Mars"--
Download or read book Large Meteorite Impacts and Planetary Evolution written by B. O. Dressier and published by Geological Society of America. This book was released on 1994-01-01 with total page 361 pages. Available in PDF, EPUB and Kindle. Book excerpt: Comprises 28 papers which grew out of the International Conference on Large Meteorite Impacts and Planetary Evolution, August/September, 1992 in Sudbury, Ontario. The interdisciplinary papers, encompassing diverse studies from trace element geochemistry to planetary exploration, are arranged into f
Download or read book Meteorite Craters and Impact Structures of the Earth written by Paul W. Hodge and published by Cambridge University Press. This book was released on 1994-08-04 with total page 138 pages. Available in PDF, EPUB and Kindle. Book excerpt: The essential guide to 139 sites where the Earth has had a direct hit from space.
Download or read book Large Meteorite Impacts and Planetary Evolution IV written by W. U. Reimold and published by Geological Society of America. This book was released on 2010-01-01 with total page 676 pages. Available in PDF, EPUB and Kindle. Book excerpt: Proceedings of the Fourth International Conference on Large Meteorite Impacts and Planetary Evolution held at the Vredefort Dome, South Africa, in Aug. 2008.
Download or read book Effects of the Atmospheric lithostatic Pressure Ratio on Explosive Craters in Dry Soil written by Robert W. Herr and published by . This book was released on 1971 with total page 96 pages. Available in PDF, EPUB and Kindle. Book excerpt: Atmospheric-lithostatic pressure ratio effects on explosive crater dimensions in dry soil.
Download or read book Large Meteorite Impacts and Planetary Evolution V written by Gordon R. Osinski and published by Geological Society of America. This book was released on 2015-10-22 with total page 236 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this volume, the geologic and planetary science communities explore impact events and how they affected the evolution of Earth and other planetary bodies. these papers are the outcome of a conference held every five years.
Download or read book Simulation of Meteoroid velocity Impact by Use of Dense Projectiles written by Robert H. Morrison and published by . This book was released on 1970 with total page 44 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Sedimentary Record of Meteorite Impacts written by Kevin R. Evans and published by Geological Society of America. This book was released on 2008-01-01 with total page 222 pages. Available in PDF, EPUB and Kindle. Book excerpt: Although about 70 percent of known terrestrial meteorite impacts involve sedimentary rocks, the response of such rock to hyper- velocity impact is not well understand. Evans (Missouri State U., Springfield) introduces a dozen papers from a session on impact geology at the 2004 Geological Society of America Annual Meeting. Arranged by rocks' stratigraphic order (oldest to youngest) in proximal and distal settings, papers study topics including: characterization of impact sediments; a model for impact cratering processes; development of breccias (rock composed of sharp fragments embedded in a fine- grained matrix) in the Chesapeake Bay impact structure; and the method of impact stratigraphy applied to aging of the K-T boundary associated with mass extinction. The well-illustrated volume is not indexed.
Download or read book Cratering in Marine Environments and on Ice written by Henning Dypvik and published by Springer Science & Business Media. This book was released on 2013-06-29 with total page 416 pages. Available in PDF, EPUB and Kindle. Book excerpt: Despite their global importance, little is known about the few existing examples of impacts into marine environments and icy targets. They are among the least understood and studied parts of impact crater geology. The icy impacts are also of great importance in understanding the developments of the outer planets and their satellites such as Mars or Europa. Furthermore, the impact mechanisms, crater formation and collapse, melt production and the ejecta distribution are scarcely known for impact on targets other than the "classical" solid silicates of the continental crust. The reaction of water and ice to impacts clearly deserves a more thorough study. The understanding of impact effects and consequences in the case of aqueous hits, soft sediments and icy targets has not been thoroughly explored and comprises the main focus of this book. A number of papers in the field of hypervelocity impacts on ice are included. These cover a review of available literature in the field of laboratory studies of such impacts, large impact structures on Titan, predicting impact cratering on a comet nucleus, and a novel report on the survival of bacteria fired at hypervelocity into icy surfaces. This latter paper is concerned with astrobiology and in particular Panspermia (natural migration of life through space).
Download or read book Impact Cratering written by H. J. Melosh and published by Oxford University Press, USA. This book was released on 1989 with total page 264 pages. Available in PDF, EPUB and Kindle. Book excerpt: This major study of crater morphology examines the physics of impact cratering, the geologic processes associated with it, and its role in planetary evolution. Melosh outlines landmark events in the history of impact cratering and places modern developments in historical perspective. Since important impact structures exist on our planet as well as on bodies in the solar system, this valuable contribution will serve as a vital reference in the diverse fields of geology, paleontology and planetary science.
Download or read book Two dimensional Computer Simulation of Hypervelocity Impact Cratering written by and published by . This book was released on 1978 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: A computational approach used for subsurface explosion cratering was extended to hypervelocity impact cratering. Meteor (Barringer) Crater, Arizona, was selected for the first computer simulation because it is one of the most thoroughly studied craters. It is also an excellent example of a simple, bowl-shaped crater and is one of the youngest terrestrial impact craters. Initial conditions for this calculation included a meteorite impact velocity of 15 km/s, meteorite mass of 1.67 x 108 kg, with a corresponding kinetic energy of 1.88 x 1016 J (4.5 megatons). A two-dimensional Eulerian finite difference code called SOIL was used for this simulation of a cylindrical iron projectile impacting at normal incidence into a limestone target. For this initial calculation, a Tillotson equation-of-state description for iron and limestone was used with no shear strength. Results obtained for this preliminary calculation of the formation of Meteor Crater are in good agreement with field measurements. A color movie based on this calculation was produced using computer-generated graphics. 19 figures, 5 tables, 63 references.
Download or read book Impact Craters in South America written by Rogelio Daniel Acevedo and published by Springer. This book was released on 2015-04-25 with total page 108 pages. Available in PDF, EPUB and Kindle. Book excerpt: A complete and updated catalogue of impact craters and structures in South America from 2014 is presented here. Approximately eighty proven, suspected and disproven structures have been identified by several sources in this continent. All the impact sites of this large continent have been exhaustively reviewed: the proved ones, the possible ones and some very doubtful. Many sites remain without a clear geological "in situ" confirmation and some of them could be even rejected. Argentina and Brazil are leading the list containing almost everything detected. In Bolivia, Chile, Colombia, Guyana, Paraguay, Perú, Uruguay and Venezuela only a few were observed. Only Ecuador is waiting for new discoveries. So far, the largest well stated impact site is still the Araguainha structure in Brazil with its 40 kilometers in diameter. However, two possible impact structures are larger than Araguainha: Malvinas, (with 250 kilometers in diameter) and Vichada in Colombia, (50 kilometers). This study also reports the existence of some Tertiary-Quaternary glassy impactite layers: the "escorias" and "tierras cocidas" of the pampas in Argentina.
Download or read book Impacts in Precambrian Shields written by Jüri Plado and published by Springer Science & Business Media. This book was released on 2002-06-13 with total page 356 pages. Available in PDF, EPUB and Kindle. Book excerpt: This multiauthor book is a compilation of fourteen papers that result from activities within the scientific programme "Response of the Earth System to Impact Processes" (IMPACT) of the European Science Foundation. The program deals with all aspects of meteorite impact research and operates through workshops, exchange programs and short courses. Most of the papers are initiated from the 4th IMPACT workshop "Meteorite Impacts in Precambrian Shields" that took place in Lappajärvi, Finland, in 2000. The volume begins with a detailed view of thirty confirmed meteorite impact structures found in the Fennoscandian Shield and its nearest surroundings. The following papers describe impact structures in different areas.
Download or read book Meteorite Impact Structures written by Christian Koeberl and published by Springer. This book was released on 2015-12-31 with total page 500 pages. Available in PDF, EPUB and Kindle. Book excerpt: Provides the first comprehensive introduction to the study of impact craters and structures. It will, thus, place emphasis of the variety of different characteristics associated to impact cratering as observed in the field and in the laboratory. Explanation of how to recognize impact structures is followed by a description of impact-diagnostic mineralogical and geochemical characteristics allowing confirmation of an impact structure. Also addresses the environmental and biological effects of impact events as well as possible associations with geological boundaries and provide extensive references and illustrations.
