Even Gov. Gary Herbert played a role, announcing the mock disaster.
He said emergency officials tested their communications and found some coordination problems.
The drill scenario called for a 7-magnitude quake, which occurs on the Wasatch Front about every 350 years.
The National Guard staffed four command posts and was ready to move medical supplies or begin search-and-rescue operations.
The Salt Lake City suburb of Draper tested an emergency notification system that alerts residents of a natural disaster based on GPS information from their mobile device.
The Utah Seismic Safety Commission says 90 percent of the state's population lives in earthquake zones.
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