The hidden seismic threat running beneath Salt Lake City
In short: The Wasatch Fault stretches 240 miles along the Rocky Mountains, directly under one of America's fastest-growing metropolitan regions. This video explores the geological history of the fault and the vulnerability of the valley below.
The documentary examines the 240-mile Wasatch Fault and the 202/2020 magnitude 5.7 earthquake near Magna, which caused power outages and building damage. While that event was significant, a magnitude 7 earthquake would release approximately 90 times more energy.
The risk is compounded by the valley's geology; deep layers of soft sediment from ancient Lake Bonneville can amplify seismic waves and cause liquefaction. This is particularly dangerous for thousands of older masonry buildings constructed before modern seismic codes. While there is no known date for the next major rupture, the Salt Lake segment last experienced a major earthquake roughly 1,400 years ago.
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Sources
- Summary by Intellect · source: The American City Built On A Fault That Nobody Talks About
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