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.

June 11, 2025 - Diana Ionescu

Metrorail train pulling into newly opened subterranean station in Washington, D.C. with crowd on platform taking photos.

Congressman Proposes Bill to Rename DC Metro “Trump Train”

The Make Autorail Great Again Act would withhold federal funding to the system until the Washington Metropolitan Area Transit Authority (WMATA), rebrands as the Washington Metropolitan Authority for Greater Access (WMAGA).

June 2, 2025 - The Hill

Large crowd on street in San Francisco, California during Oktoberfest festival.

The Simple Legislative Tool Transforming Vacant Downtowns

In California, Michigan and Georgia, an easy win is bringing dollars — and delight — back to city centers.

June 2, 2025 - Robbie Silver

Man in teal shirt opening door to white microtransit shuttle with cactus graphics and making inviting gesture toward the camera.

Albuquerque’s Microtransit: A Planner’s Answer to Food Access Gaps

New microtransit vans in Albuquerque aim to close food access gaps by linking low-income areas to grocery stores, cutting travel times by 30 percent and offering planners a scalable model for equity-focused transit.

June 13 - U.S. Department Of Transportation

Group of people at table set ouf with picnic food on street during a neighborhood block party.

This City Will Pay You to Meet Your Neighbors

A North Kansas City grant program offers up to $400 for residents to throw neighborhood block parties.

June 13 - The Kansas City Star

Crowd gathered with protest signs on April 5, 2025 on steps of Minnesota state capitol protesting Trump cuts to social security and other federal programs.

Commentary: Our Silence Will Not Protect Us

Keeping our heads down and our language inoffensive is not the right response to the times we’re in. Solidarity and courage is.

June 13 - Shelterforce Magazine