Planning for the 'Big One'—In Salt Lake City

Many people outside of Salt Lake City might not realize that the city's proximity to the Wasatch Fault puts it at risk for an earthquake likely in the range of 7.1 on the Richter scale.

1 minute read

October 1, 2015, 2:00 PM PDT

By James Brasuell @CasualBrasuell


Henry Grabar reports on the ongoing work of the Utah Geological Survey (UGS) to "to determine the history (and the ongoing potential) of earthquakes in the West Valley fault zone," where Salt Lake City is located. The question they hope to answer: Is Salt Lake City ready for the "Big One."

The "big One" is expected to occur along the Wasatch Fault. "According to a study [pdf] released this summer by the Utah chapter of the Earthquake Engineering Research Institute, “big ones” on the Salt Lake segment of the Wasatch Fault tend to occur every 1,300 to 1,500 years. The last one occurred 1,400 years ago," writes Grabar.

There are also smaller faults just across town, which the UGS is still studying to learn more about their relationship to surrounding faults.

The crux of all this study to those in the planning profession: the research is intended to produce a model of the "degree of ground shaking" in an earthquake. According to Grabar, "Research like this provides the backbone of the municipal codes that dictate how apartments, roadways, transit lines and virtually everything else in the city must be built — or should be renovated."

Tuesday, September 29, 2015 in Next City

portrait of professional woman

I love the variety of courses, many practical, and all richly illustrated. They have inspired many ideas that I've applied in practice, and in my own teaching. Mary G., Urban Planner

I love the variety of courses, many practical, and all richly illustrated. They have inspired many ideas that I've applied in practice, and in my own teaching.

Mary G., Urban Planner

Cover CM Credits, Earn Certificates, Push Your Career Forward

Logo for Planetizen Federal Action Tracker with black and white image of U.S. Capitol with water ripple overlay.

Planetizen Federal Action Tracker

A weekly monitor of how Trump’s orders and actions are impacting planners and planning in America.

July 2, 2025 - Diana Ionescu

Aerial view of town of Wailuku in Maui, Hawaii with mountains in background against cloudy sunset sky.

Maui's Vacation Rental Debate Turns Ugly

Verbal attacks, misinformation campaigns and fistfights plague a high-stakes debate to convert thousands of vacation rentals into long-term housing.

July 1, 2025 - Honolulu Civil Beat

White and purple sign for Slow Street in San Francisco, California with people crossing crosswalk.

San Francisco Suspends Traffic Calming Amidst Record Deaths

Citing “a challenging fiscal landscape,” the city will cease the program on the heels of 42 traffic deaths, including 24 pedestrians.

July 1, 2025 - KQED

Google street view of red brick multi-story power plant building in Pittsburgh, PA.

Defunct Pittsburgh Power Plant to Become Residential Tower

A decommissioned steam heat plant will be redeveloped into almost 100 affordable housing units.

July 4 - Pittsburgh Post-Gazette

Cyclist on protected bike lane in middle of street in Washington D.C. with Washington Monument obelisk visible in background.

Trump Prompts Restructuring of Transportation Research Board in “Unprecedented Overreach”

The TRB has eliminated more than half of its committees including those focused on climate, equity, and cities.

July 4 - Streetsblog USA

Blue and silver Amtrak train at small station.

Amtrak Rolls Out New Orleans to Alabama “Mardi Gras” Train

The new service will operate morning and evening departures between Mobile and New Orleans.

July 3 - New Orleans City Business