![]() ![]() 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.
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