![]() ![]() The UW-Madison news release noted no reports of damage as a result of today's tiny quake. Cliff Thurber estimates today's brief tremor at less than 0.2 on the Richter scale - enough to be noticed, but well short of calamity. The Ice Quake System for a 0.60 to a 2.1 meter antenna operates off of 24VAC or 24VDC at only 35 watts of power (50 watts of power with heated feed horn cover). Today's shake-up was minuscule compared to the reports from 60 years ago: UW-Madison geology Prof. A cryoseism, also known as an 'ice quake' or a 'frost quake,' is a seismic event potentially caused by a sudden cracking action in soil or rock that's frozen due to being saturated with ice or. The day after that tremor of 60 years ago, a group of geology students discovered "a four-foot overthrust in ice 1-1/2 feet thick." That's not much by the standards of California or other active earthquake zones, but press accounts of the time noted that the shaking was "accompanied by loud reports of breaking ice fields" and "had the sound and force of a blast." An account in the American Journal of Science ascribed the quake to "an ice fracture on Lake Mendota," and noted that it "was of sufficient intensity to shake some plaster off the ceiling of an office and to crack the sewer drain of one fraternity house." One of the most dramatic such occurrences happened a little before noon on Jan.15, 1948, when seismographs measured a tremor at 3.8 on the Richter scale. There's a lot of expansion and contraction happening out on the big ice sheets that cover Madison's lakes in winter. The release goes on to state that ice quakes (or a cryoseism) are often synchronized with loud cracking noises, "are caused by large shifts in ice and are most commonly triggered by drastic temperature changes" similar to the significant thermometer variations of recent days, and may result in pressure ridges or other fractures in the ice. ![]() According to the release, dozens of employees in buildings along the Lake Mendota shoreline phoned UW police and the facilities staff to ask about the shaking, which occurred at about 12:50 p.m., lasted for two or three seconds and registered on a seismometer at the geology department. There's a lot of expansion and contraction happening out on the big ice sheets that cover Madison's lakes in winter.Ī UW-Madison news release reports that this afternoon's brief tremor may be attributable to an ice quake. (born June 15, 1969), better known as Ice Cube, is an American rapper, songwriter, actor, and film producer.His lyrics on N.W.A's 1988 album Straight Outta Compton contributed to gangsta rap's widespread popularity, and his political rap solo albums AmeriKKKa's Most Wanted (1990), Death Certificate (1991), and The Predator (1992) were all critically and commercially successful. ![]()
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