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University of Utah study listens to the natural bridge vibrate and sing

Utah’s iconic Rainbow Bridge hums with natural and man-made vibrations, according to a new University of Utah study, published September 21 in Geophysical Research Letters. The study characterizes the different ways the bridge vibrates and what frequencies and energy sources cause the rock structure to resonate. The vibrations are small, according to geology and geophysics professor Jeff Moore, but the study provides a baseline measure of the bridge’s structural integrity and shows how human activities can rattle solid rock. (more…)

Mine Landslide Triggered Quakes

By Guest PostJanuary 6, 2014Environment, Sciencebingham canyon mine, egypt, giza, great pyramids, gsa today, j mark hale, jeff moore, keith koper, kris pankow, landslide, magnitudes, mine landslide, North America, quake, richter magnitude, rio tinto kennecott, rock avalanche, salt lake city, seismic scale, tex kubacki, trigger, united states, university of utah, utah arizona border, utah copper mine, utah seismograph stations, zion canyon

Record-Breaking Slide Would Bury Central Park 66 Feet Deep

Last year’s gigantic landslide at a Utah copper mine probably was the biggest nonvolcanic slide in North America’s modern history, and included two rock avalanches that happened 90 minutes apart and surprisingly triggered 16 small earthquakes, University of Utah scientists discovered.

The landslide – which moved at an average of almost 70 mph and reached estimated speeds of at least 100 mph – left a deposit so large it “would cover New York’s Central Park with about 20 meters (66 feet) of debris,” the researchers report in the January 2014 cover study in the Geological Society of America magazine GSA Today. (more…)

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Resonance in Rainbow Bridge

Mine Landslide Triggered Quakes