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Search results for: geophysic* in all categories

447 results found.

45 pages of results.
... extinct, but the picture becomes a little clearer, in statistical terms, if taxonomic families (groups of species) are investigated instead. Jack Sepkoski of the Department of Geophysical Sciences, University of Chicago, has compiled a record of the appearence and extinction of some 3,300 families of marine animals, of which about 2,400 ... ,15-19, 65,70-76]. The advocates of the vulcanism hypothesis have included Dewey McLean, a geologist at the Virginia Polytechnic Institute, and Vincent Courtillot, a geophysicist from the Institut de Physique du Globe, Paris. Conflicting views about the K-T transition Although the Alvarez paper of June 1980 stimulated much investigation and discussion about the possible ...
Terms matched: 2  -  Score: 118  -  26 Mar 2007  -  URL: /online/pubs/books/palmer/4nemesis.htm
22. Earthquake Lights (U.S. Geological Survey News Release) [Journals] [Catastrophist Geology]
... , New York, and J.R . Powell, a physicist at the Brookhaven National Laboratory, New York, in a report before the International Union of Geodesy and Geophysics in Moscow in 1971. (The piezoelectric effect refers to the setting up of an electric potential in certain rocks - particularly quartz - as the result of stress changes ... some earthquakes - are worthy of additional scientific investigation, according to a U.S . Geological Survey, Department of the Interior, scientist John S. Derr, a geophysicist at the USGS Denver, Colo., field center, said there are difficulties in trying to explain these phenomena because very few scientists have worked on the question of ...
Terms matched: 2  -  Score: 118  -  09 May 2004  -  URL: /online/pubs/journals/catgeo/cg77dec/06lights.htm
23. Hannes Alfvén (1908-1995) [Journals] [SIS Internet Digest]
... gained acceptance only two or three decades after their publication. Characteristically and also concomitant with his 80th birthday in 1988, Alfvén was awarded the most prestigious prize of the American Geophysical Union, the Bowie medal, for his work three decades earlier on comets and plasmas in the solar system. Disputed for 30 years, many of his theories about ... was often forced to publish his papers in obscure journals; and his work was continuously disputed for many years by the most renowned senior scientist in space physics, the British-American geophysicist Sydney Chapman. Even among physicists today there is little awareness of Alfvén's many contributions to fields of physics where his ideas are used without recognition of who conceived them. ...
Terms matched: 2  -  Score: 114  -  05 Mar 2003  -  URL: /online/pubs/journals/i-digest/2002-2/12hannes.htm
... evidence of recent stupendous volcanism on a surface that appears to be pristine. One of the first indications of this excessive volcanism was presented in May 1990 in the Journal of Geophysical Research which analyzed the sulfur content of the Venusian clouds. There Na Y. Chan et al. state: Results of recent International Ultraviolet Explorer (IUE) observations ... are highly volcanic and have thin crusts floating on magma: "Lunar craters, like terrestrial impact craterstend to be circular, whereas calderas do not." (16) Geophysicists have generally considered misshapen craters as volcanic structures on the Moon and on Io. However, when they observe misshapen craters on Venus in which nearly all craters over 12 ...
Terms matched: 2  -  Score: 114  -  30 Jul 2008  -  URL: /online/pubs/journals/aeon/vol0301/072surfc.htm
25. Monitor [Journals] [SIS Workshop]
... body? The Sun affects the mind Science Frontiers No. 91, Jan-Feb 1994, p. 1 When the admissions dates of psychiatric patients were checked against various parameters of geophysical activity, significant correlations were found with high levels of solar radioflux, sudden magnetic disturbances in the ionosphere and the index of geomagnetic activity. Lightning lights Science Frontiers No ... spreading segments do not produce a fixed amount of crust each year or erupt lava all the time. Periods of intense activity seem to be triggered about every century. Other geophysicists studying ancient vast outpourings of lava such as the Kerguelen Plateau, an elevated region of sea floor just north of Antarctica and the continental Deccan Traps in India, have ...
Terms matched: 2  -  Score: 114  -  05 Mar 2003  -  URL: /online/pubs/journals/workshop/w1994no1/24monit.htm
26. Continental Tropism and Rafting [Books] [de Grazia books]
... presence of pebble drift and till, and of glaciers or high mountain freezing may be referred to dense material fall-outs such as were discussed earlier. "In the whole of geophysics," Defant once wrote, "there is no other law of such clarity and certainty as that there exist two preferred levels in the Earth's crust."[ ... and eastwards from the East Pacific Rise at the same time. These are not contradictory motions, so far as the theory of lunagenic tropism is concerned. Most geologists and geophysicists today are satisfied that the heat generated and in part used to move the dozen plates of the world around is not so great as to make life impossible today or ...
Terms matched: 2  -  Score: 112  -  29 Mar 2004  -  URL: /online/pubs/books/degrazia/lately/ch24.htm
27. H. H. Hess and My Memoranda [Journals] [Pensee]
... of sediment caused the submergence of the sea bottom and with it the submergence of the flat-topped guyots. In his response he showed graciousness. By mid-1956 preparations for the International Geophysical Year were gaining momentum. On December 5, 1956, I gave to Hess a memo describing, in brevity, several projects for inclusion in the IGY. ( ... faculty members, he tarried), an initiative came from Dr. Franklin Murphy, at that time chancellor of the University of California at Los Angeles. He asked UCLA's geophysicist, Professor Louis Slichter, to organize a committee for the same kind of inquiry I had proposed to Hess. Murphy's initiative, however, foundered and the story needs ...
Terms matched: 2  -  Score: 110  -  05 Mar 2003  -  URL: /online/pubs/journals/pensee/ivr02/22hess.htm
... Parker, Astrophysical Journal, 128 (1958), 664-67. 22. See, for example, M. D. Montgomery et al, EOS Transactions of the American Geophysical Union. Vol. 52, No. 4 (April, 1971), 336; and K. W. Ogilvie et al, Journal of Geophysical Research, ... , wrote Rowland, "would undoubtedly tear the earth to pieces and distribute its fragments to the uttermost parts of the universe (4 ). " Such arguments have convinced geophysicists ever since Rowland's time that an electric charge on the earth cannot be held responsible for terrestrial magnetism. Most recently, it has been fashionable to rest content with the ...
Terms matched: 2  -  Score: 110  -  05 Mar 2003  -  URL: /online/pubs/journals/pensee/ivr02/06recon.htm
29. Bookshelf [Journals] [SIS Review]
... time a year of 360 days was in use" and he rejects the idea of some historians that this was due to lack of sophisticated measuring methods, rather than a geophysical fact. There is an excellent criticism of the Milankovitch theory of ice ages which is contrasted with the much more likely theory of pole shift due to frequent meteoritic bombardments ... . By comparison the range of craters presented by René Gallant in 1964 as evidence for massive meteorite bombardment seems relatively modest. Perhaps more today than when it was published, geophysicists and Solar System astronomers should read it. Most would, I feel sure, find it very enjoyable, especially for his occasional dry comment, as in the final ...
Terms matched: 2  -  Score: 108  -  05 Mar 2003  -  URL: /online/pubs/journals/review/v0504/127earth.htm
... years. These are almost unimaginable time scales and don't seem very relevant to the sort of things that maybe we're discussing. But they are very important from a geological and geophysical point of view, and certainly very important from an astronomical point of view. What I am really trying to emphasise to you is that we now have the framework ... ? Dr. Clube: No. Basically, the magnetic field is controlled by a fairly complex set of currents in the Earth's dynamo, and it is well known to geophysicists that this is a very unstable system. Essentially this means that if you whack it, it wobbles, and it's fairly clear to the theoreticians who study this system ...
Terms matched: 2  -  Score: 108  -  30 Mar 2001  -  URL: /online/pubs/articles/talks/sis/820626vc.htm
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