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U.S. Geological Survey

4.17 magnitude aftershock shakes Wasatch Front weeks after 5.7 Utah earthquake

By Lauren Bennett, KSL.com | Updated - Apr. 14, 2020 at 10:03 p.m. | Posted - Apr. 14, 2020 at 9:02 p.m.



SALT LAKE CITY — A magnitude 4.17 earthquake centered near Magna shook the Wasatch Front on Tuesday at 8:56 p.m., according to the U.S. Geological Survey.

The quake was an aftershock to a magnitude 5.7 earthquake that rattled the state on March 18, University of Utah Seismograph Stations reported.

Preliminary reports estimated the quake was a magnitude 4.2 but University of Utah Seismograph Stations later reported it was actually a magnitude 4.17 aftershock.

Many residents reported feeling the quake in Salt Lake and Davis counties, the Utah Division of Emergency Management confirmed.

Seismologists reassured residents that while a large aftershock hasn't been felt in weeks, this is normal and hasn’t made a much larger Utah quake more probable. According to the Utah Geological Survey, the March 18 earthquake has sparked more than 1,000 aftershocks.

“It’s not that unusual to have sort of a late aftershock like this,” said Keith Koper, director of the University of Utah Seismograph Stations. “So it doesn’t mean that anything has sort of fundamentally changed.”

An aftershock like this wasn’t unexpected, although it was a little late, Koper said.

It’s likely those close to the epicenter of Tuesday’s quake will continue to feel magnitude 2 and 3 aftershocks throughout the evening, he added.

Just hours before Tuesday’s aftershock, Salt Lake county and city leaders extended various declarations of emergencies related to the initial earthquake. Now, the declarations are active through July 6.

The extensions are aimed at ensuring federal funds will be available to pay for damage.

The Great Utah Shakeout, an event designed to educate individuals on how to prepare for earthquakes, was previously scheduled for Thursday and is still on.

For any Utahns feeling earthquake anxiety, resources are available here.

Contributing: Jason Tulin, KSL NewsRadio

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