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Search results for: geophysic* in all categories

637 results found.

64 pages of results.
... their fate. Instead, he argued that they were brought low by a wide-ranging, centuries-long drought (Science, 20 August 1993, p. 985) that toppled other civilizations too, including those of early Greece, the pyramid builders in Egypt, and the Indus Valley in Pakistan. But now Weiss's theory, at least as applied to the Akkadians, is getting new support from a completely independent source: an accurately dated, continuous climate record from the Gulf of Oman. At the annual fall meeting last month of the American Geophysical Union here, paleoceanographers Heidi Cullen and Peter deMenocal of Lamont-Doherty Earth Observatory in Palisades, New York, and their colleagues reported that a sediment core retrieved from the bottom of the gulf matches Weiss's version of events: The worst dry spell of the past 10,000 years began just as the Akkadians' northern stronghold of Tell Leilan was being abandoned, and the drought lasted a devastating 300 years. The new results illustrate, says Weiss, that climate change "is emerging as a new and powerful causal agent" in the ...
Terms matched: 1  -  Score: 15  -  05 Mar 2003  -  1k  -  URL: http://www.catastrophism.com/online/pubs/journals/i-digest/1998-1/07evid.htm
202. More Doubts About Small-comet Hypothesis [SIS Internet Digest $]
... From: SIS Internet Digest 1998:1 (June 1998) Home¦ Issue Contents More Doubts About Small-comet Hypothesis 27 January 1998 Small comets: Naked-eye visibility. B. Rizk& A.J. Dessler. Geophysical Research Letters, 1997, Vol.24, No.24, pp.3121-3124. University of Arizona, Lunar& Planetary Lab, Tucson, AZ 85721. We investigate an obvious consequence of the small-comet hypothesis. We find that the 30-ton cloud of water-ice particles formed by a small comet would survive long enough to be an unmistakably bright object. The visual magnitude of such clouds would be between that of a bright star and the full Moon. The two-hour periods after sunset and before sunrise ought to produce the most spectacular sightings. Because such events are not reported, we conclude that this class of object does not exist in detectable numbers. Copyright 1998, Institute for Scientific Information Inc. ...
Terms matched: 1  -  Score: 15  -  05 Mar 2003  -  1k  -  URL: http://www.catastrophism.com/online/pubs/journals/i-digest/1998-1/07more.htm
203. An Extraterrestrial Hypothesis [SIS Internet Digest $]
... From: SIS Internet Digest 1998:1 (June 1998) Home¦ Issue Contents An Extraterrestrial Hypothesis 29 January 1998 Australo-Asian tektites and a global disaster of about 10,000 years BP, caused by collision of the Earth with a comet. E. P. Izokh*. GEOLOGIYA I GEOFIZIKA, 1997, Vol.38, No.3, pp.628-660 [in Russian. *Russian Academy of Science, Siberian Division, Joint Institute of Geological Geophysics& Mineralogy, Novosibirsk 630090, Russia. About 10,000 years ago, at the Pleistocene-Holocene border, some important events occurred: the glaciation stopped abruptly; the sea level elevated, and quick (for 20-50 years) climatic and ecological changes took place, leading to the extinction of "mammoth fauna" and exerting a direct effect on mankind's evolution and appearance of civilizations. It is shown in the paper that the disaster under study was caused by the collision of the Earth with an eruptive comet, brought various volcanic tektite glasses from a remote planetary body. This extra-terrestrial source of tektites is proven by the well-known but ...
Terms matched: 1  -  Score: 15  -  05 Mar 2003  -  1k  -  URL: http://www.catastrophism.com/online/pubs/journals/i-digest/1998-1/08extra.htm
204. Cosmic Dust May Cause Climate Catastrophes [SIS Internet Digest $]
... dust in the earth's atmosphere and changes in the planet's orbit may have started the gradual extinction of dinosaurs and other life thousands of years before a massive asteroid collision dealt the final blow, according 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 moment or date in time for the extinction of life. Dermott and Kortenkamp are investigating the idea that if atmospheric dust effects the climate, then the dust may effect life on earth as well ...
Terms matched: 1  -  Score: 15  -  05 Mar 2003  -  2k  -  URL: http://www.catastrophism.com/online/pubs/journals/i-digest/1998-2/10cosmic.htm
205. Louis Frank Finds 'Small Comets' Are Seasonal [SIS Internet Digest $]
... 'Small Comets' Are Seasonal 27 May 1998 From Ron Baalke <BAALKE@kelvin.jpl.nasa.gov> University News Services University of Iowa 100 Old Public Library Iowa City, IA 52242 Contact: Gary Galluzzo (319) 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 both cases, they found a mid-January lull in the data, a seasonal phenomenon that would refute the contention of some skeptics who claim that evidence of small comets is merely electronic "noise" ...
Terms matched: 1  -  Score: 15  -  05 Mar 2003  -  1k  -  URL: http://www.catastrophism.com/online/pubs/journals/i-digest/1998-2/11louis.htm
206. Sir Fred Hoyle Vindicated After 60 Years [SIS Internet Digest $]
... Newark, Delaware Contact: Ginger Pinholster, (302) 831-6408, gingpin@udel.edu FOR VIDEOTAPE, CALL (302) 831-6408 Cosmic cloud could burst Earth's 'breathing bubble,' new Bartol computer simulation shows. BOSTON, MASS.-- A colorful new computer animation-- created by Gary P. Zank of the Bartol Research Institute at the University of Delaware-- shows how even a small cosmic cloud could suddenly burst the "breathing bubble" that protects life on our planet. The simulation, presented today during the American Geophysical Union's Spring meeting, also should help guide the spacecraft, Voyager 1 and Voyager 2, through a series of shock waves and a massive "wall" in space nearly two decades from now, says Zank, an associate professor at Bartol and a leading theoretical astrophysicist. Ongoing studies of Earth's "cocoon" might someday reveal whether close encounters with cosmic clouds cause periodic extinctions, according to Zank, who earned a National Science Foundation Presidential Young Investigator Award in 1993 and a Zeldovich Medal in 1996. "We're surrounded by hot ...
Terms matched: 1  -  Score: 15  -  05 Mar 2003  -  4k  -  URL: http://www.catastrophism.com/online/pubs/journals/i-digest/1998-2/12fred.htm
207. Electrophonic Fireballs in History [SIS Internet Digest $]
... <dis@a011.aone.net.au> Dear Benny, I was pleased to see Colin Keay's statement regarding his important work in elucidating the reality and origin of electrophonic sounds produced by bright fireballs. In his modesty, he did 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 has shown that having opportunistic transducers around the head greatly enhances the likelihood of hearing electrophonic sounds. I have myself interviewed a policeman (hence short hair) who heard an electrophonic fireball whilst his ...
Terms matched: 1  -  Score: 15  -  05 Mar 2003  -  1k  -  URL: http://www.catastrophism.com/online/pubs/journals/i-digest/1998-2/13elect.htm
208. Plasma, Plasma, Everywhere [SIS Internet Digest $]
... space is made of rock like the Earth." The plasma of the magnetosphere has many different levels of temperature and concentration. The coldest magnetospheric plasma is most often found in the plasmasphere, 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. "We've been flying in plasma for over 40 years and have slowly gained a statistical picture of what things are like, such as the density and proportion of oxygen, hydrogen, and helium, ...
Terms matched: 1  -  Score: 15  -  05 Mar 2003  -  2k  -  URL: http://www.catastrophism.com/online/pubs/journals/i-digest/1999-2/05plasma.htm
... From: SIS Internet Digest 2000:1 (May 2000) Home¦ Issue Contents Purple Salt& Tiny Drops of Water in Meteorites CCNet, 29 November 1999 From Ron Baalke <baalke@ssd.jpl.nasa.gov> Written by G. Jeffrey Taylor Hawaii Institute of Geophysics and Planetology November 24, 1999 Some meteorites, especially those called carbonaceous chondrites, have been greatly affected by reaction with water on the asteroids in which they formed. These reactions, which took place during the first 10 million years of the Solar System's history, formed assorted water-bearing minerals, but nobody has found any of the water that caused the alteration. Nobody, that is, until now. Michael Zolensky and team of scientists from the Johnson Space Center in Houston and Virginia Tech (Blacksburg, Virginia) discovered strikingly purple sodium chloride (table salt) crystals in two meteorites. The salt contains tiny droplets of salt water (with some other elements dissolved in it). The salt is as old as the Solar System, so the water trapped inside the salt is also ancient. It might ...
Terms matched: 1  -  Score: 15  -  05 Mar 2003  -  1k  -  URL: http://www.catastrophism.com/online/pubs/journals/i-digest/2000-1/11purple.htm
210. Stress & Chaos Form Tallest Mountains [SIS Internet Digest $]
... in such a furnace-like environment? William B. McKinnon, Ph.D, professor of earth and planetary sciences and Andrew J. Dombard, Ph.D., recent Ph.D at Washington University in St. Louis, 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 thermal stresses breaks up the crust and produces irregular, or chaotic, distributions of mountain peaks. Slight changes in the rate of lava flow from Io's mantle and the heating of cooler crust below ...
Terms matched: 1  -  Score: 15  -  05 Mar 2003  -  4k  -  URL: http://www.catastrophism.com/online/pubs/journals/i-digest/2001-1/15stress.htm
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