University of Utah Seismograph Stations
Released: March 05, 2017 1:30 PM MST
The University of Utah Seismograph Stations reports that a minor
earthquake of magnitude 3.3 occurred at 12:14 PM on March 05, 2017
(MST). The epicenter of the shock was located in the Cedar Valley,
6 miles WSW of Enoch, UT and 7.1 miles NNW of Cedar City, Utah.
The earthquake was reported felt in the vicinity of Cedar City.
A total of 34 earthquakes of magnitude 3.0 or greater have
occurred within 16 miles of the epicenter of this event since 1962.
Anyone who felt the earthquake is encouraged to fill out a survey form
either on the Seismograph Stations website: www.quake.utah.edu or the
US Geological Survey website: earthquake.usgs.gov.
Date (UTC): March 05, 2017 Time (UTC): 19:14
Date (local): March 05, 2017 Time (local): 12:14 PM MST
Latitude: 37 45.82′ N
Longitude: 113 7.99′ W
Preferred magnitude: 3.30 Ml
In spring 2013, observation systems at Utah’s Bingham Canyon copper mine detected ground movement in a hillslope surrounding the mine’s open pit. Out of caution, mine managers evacuated personnel and shut down production, waiting for the inevitable.
On April 10, at 9:30 p.m. and again at 11:05 p.m., the slope gave way and thundered down into the pit, filling in part of what had been the largest man-made excavation in the world. Later analysis estimated that the landslide was at the time the largest non-volcanic slide in recorded North American history. Now, University of Utah geoscientists have revisited the slide with a combined analysis of aerial photos, computer modeling, and seismic data to pick apart the details. The total volume of rock that fell during the slide was 52 million cubic meters, they report, enough to cover Central Park with 50 feet of rock and dirt. The slide occurred in two main phases, but researchers used infrasound recordings and seismic data to discover 11 additional landslides that occurred between the two main events. Modeling and further seismic analysis revealed the average speeds at which the hillsides fell: 81 mph for the first main slide and 92 mph for the second, with peak speeds well over 150 mph.
The study shows how the team’s methods can be used to remotely characterize a landslide, and the details they elicited from the data may be useful in planning for and modeling future landslide events.
The results are published in Journal of Geophysical Research-Earth Surface.
Animations of both phases of the slide can be found here: