9 results found containing all search terms.
... Science Frontiers ONLINE No. 71: Sep-Oct 1990 Issue Contents Other pages Home Page Science Frontiers Online All Issues This Issue Sourcebook Project Sourcebook Subjects Wyoming: is old faithful a strange attractor?" Eruptions of Old Faithful Geyser are generally perceived as extremely regular events, with variation of eruptive interval being attributed to random noise. The governing equations for such a hydrothermal system are highly non-linear, therefore it is reasonable to assume that such systems are capable of operating in regines that display chaotic behavior. Three-dimensional state-space reconstruction of eruption time data provides strong evidence of a strange attractor quite similar to the Rossler attractor. Establishing the system as chaotic indicates that while one can predict eruptive intervals in the short term, long term predictions regarding Old Faithful's eruptive behavior ... impossible, no matter how carefully and accurately the system is modeled. The mean eruptive interval of Old Faithful has changed over time. This is consistent with the behavior of a chaotic system, which by definition must be nonstationary in the mean. Seismic activity is believed to be a perturbation shifting Old Faithful into a new chaotic state with a different shape to the strange attractor. A simple non-linear dynamic model of geyser behavior is proposed that leads to chaotic behavior and is consistent with the observations of eruption interval data for Old Faithful." (Nicholl, Michael, et al; "Is Old Faithful a Strange Attractor?" Eos, 71:466, 1990.) Comment. "Strange attractor" is a specialized term employed in chaos analysis. So, Old Faithful is not ...
Terms matched: 2 - Score: 657 - 15 May 2017 - URL: /sf071/sf071g16.htm
... Science Frontiers ONLINE No. 77: Sep-Oct 1991 Issue Contents Other pages Home Page Science Frontiers Online All Issues This Issue Sourcebook Project Sourcebook Subjects Some Old Geysers Are Not So Faithful Yellowstone's Old Faithful has a namesake in Calistoga, California. This notso-well-known geyser is usually very dependable, erupting every 90 minutes, shooting 350 F water 60 feet into the air. However, some 60 hours before the October 1989, 7.1 -magnitude quake in the San Francisco Bay area, the geyser's period suddenly lengthened to more than 100 minutes. After the quake, it settled back into its usual routine. Prior to two other earthquakes, in 1975 and 1984, the clockwork of Calistoga's Old Faithful also ran slow. (Anonymous; ... Unfaithful Geyser," Discover, 12:8 , July 1991.) Comment. Since the quake epicenters were many miles distant from the geyser, how is the geyser's clockwork altered? Somehow, small earth movements must have changed the size of the geyser's water reservoir or, possibly, pressure changes in the surrounding rocks might have reduced the flow of water into the reservoir. Pertinent here are the often-observed changes in well levels and spring flows prior to earthquakes. Reference. Geysers display many anomalies. These are cataloged in GHG1-GHG3 in the book Earthquakes, Tides. For details on ordering, visit: here . From Science Frontiers #77, SEP-OCT 1991 . 1991-2000 William R. Corliss ...
Terms matched: 2 - Score: 511 - 15 May 2017 - URL: /sf077/sf077g16.htm
... : a periodic spring "Near the base of a limestone cliff in Wyoming's Bridger-Teton National Forest, spring water gushes from an opening for several minutes, stops abruptly, then begins a new cycle a short time later. This is Periodic Spring, whose intermittent flow is a rare geologic phenomenon. The water is cold and clear, an indication that this is not a geyser like Old Faithful; such geysers, of volcanic origin, send forth hot water. Through the years various observers have timed the flows at anywhere from four to twentyfive minutes, with similarly varying dry spells. The intermittent flow is especially regular in late summer and autumn. During stormy periods or when there is heavy snow melt-off, the flow fluctuates but does not stop entirely." At full ... , Periodic Spring discharges about 285 gallons/second into a stream 9 feet wide and 1 feet deep. Periodic Spring, therefore, is fairly impressive, but it is not anomalous. (Mohlenbrock, Robert H.; "Periodic Spring, Wyoming," Natural History, 99: 110, April 1990.) Comment. Siphon action nicely explains periodic springs. Water keeps flowing through the upper loop until the water level in the reservoir drops below the siphon intake. The spring will not flow again until the reservoir fills to the top of the upper loop(level a) again initiating siphon action. Siphon action seems simple and easy to explain; why mention it here? Well, spherical pendulums are ostensibly simple, too, but we now know that they sometimes run amok and chaotic ...
Terms matched: 2 - Score: 282 - 15 May 2017 - URL: /sf071/sf071g15.htm
... Science Frontiers ONLINE No. 49: Jan-Feb 1987 Issue Contents Other pages Home Page Science Frontiers Online All Issues This Issue Sourcebook Project Sourcebook Subjects Those Old Maps Of Antarctica Was Antarctica nearly ice-free within the last few thousand years? Did the old navigators sail into these now-frigid waters and map this great southern continent? One way to answer such questions is by turning to old maps and, then, asking the geophysicists if most of the continent's ice cover could have disappeared fairly recently, as some ancient maps are purported to show. C.P . Hapgood, well known for his book Maps of the Ancient Sea Kings, believed that ancient mariners did indeed map Antarctica when those climes were warmer. More recently, J.G . Weihaupt came to ... studies of this period. These studies were not done by dunces, but by individuals who spent years acquiring the skills and perception necessary to interpret the evidence. Professor Hapgood, to his credit, spent almost ten years studying the evidence and consulting experts in the field. His ideas were rejected in scholarly circles not because of animus but because he had not proved his case. Too many leaps of faith were needed to establish his thesis. I fear it is impossible to be equally charitable toward some later advocates of the Hapgood thesis, whose methods do little credit to his memory." (Jolly, David C.; "Was Antarctica Mapped by the Ancients," Skeptical Inquirer, 11:32, 1986.) Antarctica is in the eye of the beholder. Do these two maps ...
Terms matched: 2 - Score: 267 - 15 May 2017 - URL: /sf049/sf049p01.htm
... RIDICULOUS! The sweet track Another anomaly bites the dust Astronomy Modern technology gets Two hot spots on mercury Astronomers cope with both Biology NATURE COMMUNICATES IN MYSTERIOUS WAYS Those amazing insects The bombardier beetle pulse-jet Duesberg revisited Geology Pennsylvanian time-scale problems OF TIME AND THE CORAL - AND OTHER THINGS, TOO Paleomagnetic pitfalls What's another dipole or two? Wyoming: a periodic spring WYOMING: IS OLD FAITHFUL A STRANGE ATTRACTOR? Geophysics Ball lightning studies LUNAR ECLIPSES AND RADIO PROPAGATION General Novel forms of matter ...
Terms matched: 2 - Score: 248 - 15 May 2017 - URL: /sf071/index.htm
... Science Frontiers ONLINE No. 111: May-Jun 1997 Issue Contents Other pages Home Page Science Frontiers Online All Issues This Issue Sourcebook Project Sourcebook Subjects Exotic Seismic Signals Not all terrestrial tremors emanate from buckling crust and slipping tectonic plates. The crashing of large waves on a seashore sends "microseisms" to sensitive instruments hundreds of kilometers away. The bubblings of Old Faithful geyser give rise to an enduring and engaging "harmonic tremor." As for the more "exotic" sources of seismic signals, they had an entire session devoted to them at the Fall 1996 meeting of the American Geophysical Union. Here are two of the unusual seismic events presented there. July 10, 1996. Yosemite National Park. "At 6:52 pm PDT Wednesday, July 10, 1996, a large ... of granite, with an estimated mass of 80,000 to 184,000 tons, detached from the cliff between Washburn Point and Glacier Point, in Yosemite Valley. The rock mass subsequently launched from the cliff and free-fell ballistically an estimated 550 m before impacting approximately 30 meters from the base of the cliff in the Happy Isles area of the valley floor in Yosemite National Park...This rock fall was well recorded by 3 UC Berkeley (BDSN) and Caltech (TERRAscope) broadband seismographic stations and 15 shortperiod seismographic stations (operated by the USGS in Menlo Park and the University of Nevada, Reno). In fact, it is the largest vertical rock free-fall ever recorded seismically and it registered on seismographs up to 200 km distant." (Uhrhammer, R ...
Terms matched: 2 - Score: 218 - 15 May 2017 - URL: /sf111/sf111p12.htm
... dimensionless and almost exactly equal to 1/137. (Why 137? That's another question!) Anyway, the Australians got a good fix on the constant's value 2 billion years ago by measuring the composition of the nuclear waste produced by the Olko natural nuclear reactors in Gabon, Africa. It hasn't changed since then. The spectra of distant quasars 7 billion years old also signaled no change. But more-distant and, therefore, supposedly older, gas clouds have suggested that a slightly smaller fine-structure constant held sway then. No known experimental error can account for this difference. "If confirmed, would Webb's findings eventually be explained by a deeper theory, vindicating physicists' faith in a uniform nature? Or would they mean that we ... in a frighteningly arbitrary and variegated cosmos, where huge swathes of space abide by alien principles?" (Musser, George; "Inconstant Constants," Scientific American, 279:24, November 1998.) Comment. Even as we write, some distant part of the cosmos may be coming into estrus for life-as-we-do-not-knowit. See SF#34 for "Already, now, we are forgotten on those stellar shores." From Science Frontiers #121, JAN-FEB 1999 . 1999-2000 William R. Corliss ...
Terms matched: 2 - Score: 214 - 15 May 2017 - URL: /sf121/sf121p03.htm
... IN THOSE FIJI UNDERWATER CAVES: NEVERTHELESS, THE MYSTERY DEEPENS DO BIRDS USE GENETIC MAPS DURING MIGRATION? Cooler heads, bigger brains? The aye-aye, a percussive forager identical Geology VALLEYS OF DEATH AND ELEPHANT GRAVEYARDS Anthracite man? METHANE HYDRATE: PAST FRIEND OR FUTURE FOE? The gruyerizaton of switzerland faulting Geophysics CROP CIRCLES: DAISY PATTERNS AND A RED BALL OF LIGHT Hovering ball of fire SOME OLD GEYSERS ARE NOT SO FAITHFUL WATER'S MEMORY OR BENVENISTE STRIKES BACK Physics Drip, drop, drup, dr** ...
Terms matched: 2 - Score: 213 - 15 May 2017 - URL: /sf077/index.htm
... Science Frontiers ONLINE No. 101: Sep-Oct 1995 Issue Contents Other pages Home Page Science Frontiers Online All Issues This Issue Sourcebook Project Sourcebook Subjects "ALMOST INCONCEIVABLE" CHANGES IN THE GEOMAGNETIC FIELD A decade ago, a trio of geophysicists published a group of papers based on their measurements of the remnant magnetism of the 16-million-year-old layered lava flows at Steens Mountain, Oregon. (SF#45) At that time, they claimed that these finely bedded lava flows testified that, during a field reversal, the earth's field swung around at the astonishing rate of 3 per day! This rate is about one thousand times the current rate of polar drift. Mainstream geophysicists could not believe the 3 /day figure because it implied incredibly rapid changes in the ... They now find that the geomagnetic field probably shifted as much as 6 in a single day. Their work has been carried forward so professionally and meticulously that other scientists are finding their conclusions harder and harder to dismiss. Instead, the search is on for explanations of the rapid field changes. Three possibilities have been advanced -- all of them unpalatable to geophysicists: The Steens Mountain rocks are not faithful recorders of the main geomagnetic field. Should this be actually so, the whole field of paleomagnetism, including plate tectonics, is undermined, for it depends upon similar measurements. The earth's molten core can change rapidly, at least in some regions, in response to forces still unrecognized. This, of course, is not really a satisfying "explanation." The dynamo theory of ...
Terms matched: 2 - Score: 213 - 15 May 2017 - URL: /sf101/sf101g11.htm
