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... 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: 190 - 15 May 2017 - URL: /sf111/sf111p12.htm
... Science Frontiers ONLINE No. 38: Mar-Apr 1985 Issue Contents Other pages Home Page Science Frontiers Online All Issues This Issue Sourcebook Project Sourcebook Subjects Listening With The Feet "Male white-lipped frogs exhibit conspicuous behavioral responses to calling conspecific males that are nearby but out of view. Since the calls often are accompanied by strong seismic signals (thumps), and since the male white-lipped frog exhibits the most acute sensitivity to seismic stimuli yet observed in any animal, these animals may use seismic signals as well as auditory signals for intraspecific communication." (Lewis, Edwin R., and Narins, Peter M.; "Do Frogs Communicate with Seismic Signals?" Science, 227:187, 1985.) Comment. Rabbits often thump the ground to communicate, but ... thumps are thought to be sound generators rather than vibration generators. From Science Frontiers #38, MAR-APR 1985 . 1985-2000 William R. Corliss ...
Terms matched: 2 - Score: 152 - 15 May 2017 - URL: /sf038/sf038p09.htm
... Events GHT2 Sonar-Detected Subsurface Oceanic Structures GHT3 Nonvolcanic Underwater Eruptions GHT4 Anomalous El Ninos GHT5 The Guinea Tide GHT6 Energy Transfer to Hurricanes GHT7 Oceanic Rings and Eddies GHT8 Large-Scale Oceanic Chemical Anomalies Deep-Sea Storms Curious Drifts Gas-Hydrate Blowouts Great Whirlpools and Vortices The Gibraltar Dam Oceanic Megaplumes Gulf-Stream Reversal Oceanic Dead Zones Organized Structures in Bubble Clouds North Atlantic Oscillations El Ninos Correlated with Seismicity GHW REMARKABLE WAVE PHENOMENA GHW1 Unexplained Solitary Waves GHW2 Periodic Bands of Waves GHW3 Sudden, Unexpected Onset of High Surf GHW4 Downstream Progressive Waves in Rivers Increasing Heights of North Atlantic Waves GI INCENDIARY PHENOMENA GIC CYCLIC FIRES Forest-Fire Cycles GIS SUPPOSED SPONTANEOUS COMBUSTION Unexplained Fires GIW REMARKABLE FIRE STORMS The Peshtigo Horror GL LUMINOUS PHENOMENA GLA AURORA-LIKE PHENOMENA GLA1 Auroral Pillars: Natural Searchlight beams GLA2 Sky- ... Glow... GEL7 Spectral Dispersion near the Sea's Surface GEL8 Low-Sun Landscape Fluorescence GEL9 Low-Sun Spectral Bows GEL10 Low-Sun Shadow Bands GEL11 The Second Purple Light GEL12 Moving Patches of Light on the Horizon Jumping Stars Post-Twilight Infrared Brightening of the Sky Extraordinary Sunsets GEM THE MAGIC OF MIRAGES GEM1 Fata Morganas GEM2 Telescopic Mirages GEM3 Lateral Mirages GEM4 Multiple Mirages GEM5 Mirages Sensitive to the Observer's Position GEM6 The Novaya Zemlya Effect GEM7 Illusions of a Flat Earth GEM8 Dynamic Mirages GEM9 Mirror or Reflection Mirages Double Moons Mock Mirages GER RADIO AND RADAR ANOMALIES GER1 Long-Delayed Radio Echos GER2 The Moon's Effect on Radio Propagation GER3 Thunderstorm Modification of Radio Propagation GER4 Stable Patterns of Electromagnetic Radiation GER5 Unidentified Radio Signals... GER6 The Humming Earth GER7 Polar ...
Terms matched: 2 - Score: 127 - 15 May 2017 - URL: /cat-geop.htm
... Vision BMT UNUSUAL FACULTIES AND TALENTS BMT1 Magnetic Orientation and Navigation in Mammals BMT2 Long-Range Navigation in the Absence of Recognized Cues BMT3 Short-Range Operational Prowess Despite Suppressed Visual and Olfactory Cues BMT4 Mammal Behavior Implying the Existence of Other Unrecognized Senses BMT5 Curious Examples of Soaring and Parachuting Mammals BMT6 Unusual Swimming Capabilities of Terrestrial Mammals BMT7 Remarkable Diving Capabilities of Distantly Related Mammals BMT8 Unusual Vocalizations in Mammals BMT9 Seismic Communication BMT10 Mammals That Imitate Human Words BMT11 Tool Use and Manufacture BMT12 Mammalian Engineering Works Chimps Signal with Vegetable "Notes" Whales' Detection of Holes in Ice Identification and Consumption of Medicinal Foods Dog Detects Onset of Human Seizures Dog Detects Human Cancers BMU UNRECOGNIZED MAMMALS BMU1 MacFarlane's Bear: A Yellow Giant BMU2 The Onza: An Unrecognized North American Cat? BMU3 De Loy's Ape ... Remarkable Tongue Adaptations BBO8 The Loss and Reduction of Reproductive Organs BBT UNUSUAL TALENTS AND FACULTIES BBT1 Infrasound and Atmospheric Pressure-Change Detection BBT2 Utility of Ultraviolet Vision in Birds BBT3 Echolocation: Parallel Evolution in Birds BBT4 Navigational Feats during Migration BBT5 Homing: Release Experiments BBT6 Curious Migration Phenomena: Navigation Errors? BBT7 Complexity and Sophistication of Avian Navigation BBT8 Inheritance of Migration Data BBT9 The Existence of Avian Migration BBT10 Sensitivity to Impending Weather and Earthquakes BBT11 Possible Unrecognized Senses BBT12 Remarkable Feats of Flight BBT13 The Origin of Avian Flight BBT14 Unanswered Questions Concerning Flightlessness BBT15 Some Curiosities of Avian Flight BBT16 Deep-Diving Capabilities BBT17 Vocal Mimicry in Birds BBT18 Birds That Vocally Mimic Only in Captivity BBT19 Vocal Mimicry of Hosts by Parasitic Species BBT20 Duetting BBT21 Chorusing BBT22 Large Vocal-Repertoire Sizes and High Speeds of Delivery BBT23 Female ...
Terms matched: 2 - Score: 123 - 15 May 2017 - URL: /cat-biol.htm
... 1998 Issue Contents Other pages Home Page Science Frontiers Online All Issues This Issue Sourcebook Project Sourcebook Subjects Earthquake Weather Folklore reserves the term "earthquake weather" for the sultry, ominously uneasy period said to precede large earthquakes. Scientists have generally belittled suggestions that weather could have anything to do with the ponderous forces unleashed during a quake. Despite such authoritative pronouncements, many Californians, who have ample experience with seismic events, insist that quakes and weather are somehow connected. They may be right -- at least some of the time. In the five years following the 7.3 Landers earthquake of June 28, 1992, the frequency of smaller quakes has peaked reliably every September. However, before the Landers event, no such pattern is evident. One thought is that the average atmospheric pressure, ... is lower in the summer months, reduces the downward pressure on the earth's crust enough to allow easier slippage along fault lines. This sounds reasonable, but why did this effect not occur before the Landers quake? The answer given is that perhaps the Landers event "sensitized" nearby faults! (Monastersky, R.; "California Shakes Most Often in September," Science News, 152:373, 1997.) Since the Landers event, Earthquakes in the weestern U.S . have been following an annual cycle. From Science Frontiers #116, MAR-APR 1998 . 1998-2000 William R. Corliss ...
Terms matched: 2 - Score: 121 - 15 May 2017 - URL: /sf116/sf116p15.htm
