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Search results for: geophysic* in all categories
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... dimensions of the crater. We may have, in a number of cases, a general idea of the direction from which the body was coming in, but we are reduced to `educated guesses' for determining the other factors mentioned and the distribution of the percentages of energy between the different effects. Most of the time, geologists and geophysicists are confronted with features of which the possible or probable meteoritic origin must first be established on imperfect criteria before the mathematical problems can be raised. Then, if they wish to form an idea of what might have happened, they will have to study some well-chosen specific cases which will give them generally an upper and a lower limit for ...
182. Cosmic Dust May Cause Climate Catastrophes [Journals] [SIS Internet Digest]
... to research from the University of Florida and the Carnegie Institution of Washington. The dust build-up, which rises and falls on about a 100,000-year cycle, also may answer some big questions researchers have about the history of earth's climate, said Stanley Dermott, chairman of UF's astronomy department. "A major, outstanding problem in present day geophysics is understanding the history of earth's climate," said Dermott. The research will be published in the Friday (5 /8 ) issue of the journal Science. Dermott said every 100 million years the majority life on earth is destroyed by a catastrophic event, such as an asteroid striking Earth's surface, but history doesn't show an exact ...
183. Nuclear Geological Dating [Books]
... any re-fusion of the rocks, subsequent to their primeval formation, or any, heating to temperatures allowing the escape of parent, daughter, or end products. It is nevertheless admitted that in some cases daughter elements may migrate `at a considerable distance from the parent,18 and may even escape in proportions which have been carefully studied by geophysicists. We will now examine briefly the methods which are used, and see what they are worth. In a later section we will discuss the validity of the abovementioned assumptions in the light of cosmic catastrophism. 2. Uranium and thorium decay following a chain19 of which the end (stable) products are the isotopes of lead Pb20682, ...
184. Louis Frank Finds 'Small Comets' Are Seasonal [Journals] [SIS Internet Digest]
... 384-0009; fax (319) 384-0024 e-mail: gary-galluzzo@uiowa.edu Release: Louis A. Frank presented a new study supporting his "small comet" theory that more than 25,000 snow comets weighing 20 to 40 tons each disintegrate in the Earth's atmosphere every day. The study, presented at the spring meeting of the American Geophysical Union (AGU) in Boston, is based upon data gathered by NASA's Dynamics Explorer 1 and Polar satellites and shows that the number of snow comets observed varies with the seasons. Frank and his UI colleague John B. Sigwarth analyzed 1981 data collected by Dynamics Explorer 1 and compared it to data gathered by Polar in 1997. In ...
185. Bombarded Earth by René Gallant [Books]
... endowed with sufficient energy, impacts by such bodies must, by the laws of mechanics, suddenly have altered our Earth's attitude and motions, with cataclysmic effect, resulting, among other things, in abrupt and permanent climatic changes. If this is so (and Gallant's evidence cannot simply be dismissed or explained away by any unbiased reader), geophysicists, oceanographers, geologists, palaeontologists, archaeologists-and, indeed, all scientific specialists concerned with Earth-history-will have to look again critically at some of their basic conceptions, established long since on the assumption (for it is nothing more than that) that, under the influence of the ordinary, slow, geological agencies which we can any day observe ...
186. Electrophonic Fireballs in History [Journals] [SIS Internet Digest]
... not mention his recent review on this subject: C.S .L . Keay, Continued progress in electrophonic fireball investigations', Earth, Moon & Planets, 68, 361-368 (1995). This I mention because it might be of particular interest to readers of the CC Digest; the final sentence of his abstract reads: "Geophysical electrophonic phenomena may explain many baffling reports from ancient historical writings." Note also that the ancients might have been more likely to have heard electrophonic phenomena (independent of the occurrence rate) because they tended to have longer hair and wear headgear, although their lack of spectacles would have had a negative effect! I jest not: Keay ...
187. Plasma, Plasma, Everywhere [Journals] [SIS Internet Digest]
... a donut-shaped region surrounding the Earth's middle. But plasma from the plasmasphere can be detected throughout the magnetosphere because it gets blown around by electric and magnetic forces. Gallagher has developed a general model to describe the density of the plasma surrounding the Earth. His paper, "Global Core Plasma Model," will be published in the Journal of Geophysical Research. "Core plasma" refers to the low-energy plasma (0 to 100 eV) that makes up the plasmasphere. Rockets, satellites and the space shuttle have flown in parts of the core plasma neighborhood. By taking various measurements of this region, scientists have gradually come to understand the basic nature of the entire plasmasphere. " ...
188. Stress & Chaos Form Tallest Mountains [Journals] [SIS Internet Digest]
... and Paul M. Schenk, Ph.D ., of Houston's Lunar and Planetary Institute, answer this geological conundrum in the February issue of the journal Geology. The paper is "Chaos on Io A model for formation of mountain blocks by crustal heating, melting, and tilting". The work was funded by NASA's Planetary Geology and Geophysics and Jovian Systems Data Analysis Programs. "Two things work in concert to produce Io's mountains,"says McKinnon "These are compressive stress, due to the general movement or sinking of the crust closer to Io's center, and thermal stress which is generated when regions of cool crust suddenly become heated." The combination of compressive and ...
189. Sacred Science Institute [Journals] [SIS Internet Digest]
... & Hurricanes by L. Don Leet: 1946 232p. A Detailed Historical Work on the History of Catastrophe Tracing their Cycles & Causes Over the Centuries. Contents: Culmination of Catastrophe; Earthquakes; Volcanoes; Mountain Making as the Cause Of Earthquakes & Volcanoes; Mountain Making & Volcanoes In the Pacific; Tidal Waves; Hurricanes & Typhoons; Geophysical Fables - Atlantis To Zealots. CAT#101 $44.44 The Last Change In The Earth's Axis by Fred G. Plummer: 1894 Baumring Pick on the Orientation of the Earth's Axis & Its Changing Position. Important to Understand the Precession of the Equinox. Contents: Proposition; Axis Orientation of Various Planets; Geological Facts; ...
190. Conferences [Journals] [SIS Internet Digest]
... glasses in crystalline and sedimentary targets - melt sheets and melt breccias within the impactite sequence * Mass-movement of subsurface materials as revealed by macroscopic and microscopic observations from crater floors, mega-block zones, central uplifts, peak rings, and collar rocks* Impacts in marine environments * Impacts on other planets * Material response to hypervelocity impact - shock metamorphism * Geophysical signatures of planetary impacts * Economic significance of impacts * Experimental and numerical studies. Sponsored by: Lunar and Planetary Institute; Stadt Nördlingen; Humboldt University, Berlin; University of Münster; Märker Zementwerke AG; Meteoritical Society; The Barringer Crater Company. Meeting Organizers: Burkhard Dressler, Lunar and Planetary Institute, email: dressler@lpi ...
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