M 2.3, widely felt near Magna, UT

PRESS RELEASE

University of Utah Seismograph Stations

Released: October 10, 2020 07:00 AM MDT

The University of Utah Seismograph Stations reports that a small earthquake of magnitude 2.3 occurred at 11:18 PM yesterday evening, October 9, 2020 (MDT).  The shock was located 6.6 miles beneath the northwestern part of the Salt Lake Valley, 2.9 mi E of Magna, UT.  This earthquake was an aftershock of the magnitude 5.7 earthquake that occurred in the same area on March 18.  Today’s aftershock was felt by hundreds of residents of the Salt Lake Valley. To date, the University of Utah Seismograph Stations has located 2,498 aftershocks from the March 18 earthquake, including 115 of magnitude 2.3 or larger and 40 of magnitude 3.0 and larger. In recent weeks there has been, on the average, approximately one aftershock per day large enough to locate, most of them smaller than magnitude 2.0.  Aftershock activity is expected to continue for months, but with the rate continuing to decrease with time.

Anyone who felt the earthquake is encouraged to fill out a survey form on the US Geological Survey website: earthquake.usgs.gov.

Earthquake Summary:

Date (UTC):   October 10, 2020       Time (UTC):   05:18

Date (local): October 09, 2020       Time (local): 11:18 PM MDT

Latitude:     40 42.71′ N

Longitude:    112 3.24′ W

Preferred magnitude: 2.3 Ml

M 2.7 near Logan, UT

PRESS RELEASE
University of Utah Seismograph Stations
Released: September 19, 2020 10:45 PM MDT

The University of Utah Seismograph Stations reports that an earthquake of magnitude 2.7 occurred at 09:56 PM on September 19, 2020 (MDT). The hypocenter of the shock was located 11 miles beneath Logan Canyon in the Bear River Range,  7 miles east northeast of Logan, UT. 

This earthquake was reported felt by residents of Logan and other cities and towns in the Cache Valley. Today’s earthquake occurred in a seismically active area of Utah. A total of 14 earthquakes of magnitude 3.0 or greater have occurred within 16 mi of the epicenter of this event since 1962. The largest of these events was a magnitude 4.6 that occurred on March 17, 1966, 14 miles east of Providence, UT.

Anyone who felt the earthquake is encouraged to fill out a survey form on the US Geological Survey website: earthquake.usgs.gov.

Earthquake Summary:

Date (UTC):   September 20, 2020         Time (UTC):   03:56
Date (local): September 19, 2020         Time (local): 09:56 PM MDT
Latitude:     41 45.95′ N
Longitude:    111 42.32′ W
Preferred magnitude: 2.7 Ml

2018 Annual Report

2018 was an especially difficult year because of the unexpected death of Dave Drobeck on February 11. Dave served the University of Utah Seismograph Stations (UUSS) for over 20 years and was instrumental in developing the Yellowstone Seismic Network into one of the premier volcano monitoring networks in the world. Dave’s loss was especially hard on the UUSS engineering group—Corey Hatch, Wes O’keefe, and Jon Rusho—who had to take up extra work duties while grieving the loss of their colleague. A summary of Dave’s career was presented by Bob Smith at a ceremony on February 22, and is reprinted in this report. 

While someone like Dave can never truly be replaced, I am happy to report that a former UUSS undergraduate research assistant, ArvindParapuzha, agreed to return to UUSS as a seismic engineer trainee in May, and that Wes O’keefe worked his first full field season in Yellowstone this past fall. On July 1, long-time seismic analyst Mark Hale was promoted to senior application systems analyst. Congratulations, Mark!

The biggest highlight of 2018 was the June 14 announcement that the University of Utah had been selected to receive a $140 million grant from the Department of Energy to develop the Frontier Observatory for Research in Geothermal Energy (FORGE) site near Milford, Utah. The selection was due in no small part to the effort of UUSS associate director Kris Pankow and her team of students and staff, who created a seismic mitigation plan for the project. Dr. Pankow will continue managing the FORGE seismic risk as work ramps up over the next several years.

We look forward to an exciting new year in 2019. I encourage you to visit our revamped web page at quake.utah.edu to stay up-to-date on our new initiatives and products as well as to find out about the latest seismic activity in Utah. You can also follow UUSS on Twitter with the handle @UUSSQuake.

Best wishes,

Keith D. Koper, UUSS Director

M 3.7 Near Enterprise, UT

PRESS RELEASE

University of Utah Seismograph Stations

Released: July 21, 2020 04:45 AM MDT

The University of Utah Seismograph Stations reports that a minor earthquake of magnitude 3.7 occurred at 03:44 AM on July 21, 2020 (MDT).  The epicenter of the shock was located in southwest Utah, 14 miles east of Enterprise, UT and about 28 miles north of St. George, UT.

This earthquake was reported felt in the surrounding region including in the cities of Hurricane and St. George, UT.  A total of 6 earthquakes of magnitude 3.0 or greater have occurred within 16 miles of the epicenter of this event since 1962.  The largest of these events was a magnitude 4.2 on April 04, 1981, 14.5 miles west-southwest of Cedar City, UT.

Anyone who felt the earthquake is encouraged to fill out a survey form on the US Geological Survey website: earthquake.usgs.gov.

M4.2 Aftershock, near Magna UT

PRESS RELEASE

University of Utah Seismograph Stations

Released: April 14, 2020 10:15 PM MDT

The University of Utah Seismograph Stations reports that a light earthquake of magnitude 4.2 occurred at 08:56 PM on April 14, 2020 (MDT). The epicenter of the shock was located in the northwestern part of the Salt Lake Valley, 3.3 mi NE of Magna, UT. This earthquake was an aftershock of the magnitude 5.7 earthquake that occurred in the same area on March 18, and was the largest aftershock to occur since the day of the magnitude 5.7 mainshock. Today’s aftershock was widely felt in the Wasatch Front region of Utah, especially in the Salt Lake Valley. To date, the University of Utah Seismograph Stations has located 1,247 aftershocks from the March 18 earthquake, including four others of magnitude 4.0 or larger (all on March 18) and 39 of magnitude 3.0 and larger. The aftershock activity is expected to continue for at least several more weeks, but with the rate continuing to decrease with time.

Anyone who felt the earthquake is encouraged to fill out a survey form on the US Geological Survey website: earthquake.usgs.gov.

Earthquake Summary:

Date (UTC): April 15, 2020 Time (UTC): 02:56

Date (local): April 14, 2020 Time (local): 08:56 PM MDT

Latitude: 40 43.92′ N

Longitude: 112 3.54′ W

Preferred magnitude: 4.2 Ml

Magnitude 5.7 near Magna, UT

PRESS RELEASE

University of Utah Seismograph Stations

Released: March 18, 2020 8:20 AM MDT

The University of Utah Seismograph Stations reports that a moderate
earthquake of magnitude 5.7 occurred at 07:09 AM on March 18, 2020
(MDT). The epicenter of the shock was located in the northwestern
Salt Lake Valley, 3.1 mi N of Magna, UT. This earthquake was widely
felt throughout the Wasatch Front area of north-central Utah. It
has been followed by numerous aftershocks, including 20 of magnitude
3.0 or larger during the first hour after the M 5.7 and two of
magnitude 4.0 or larger. The largest aftershock so far was a M 4.6
event that occurred at 7:14 am.

Today’s earthquake was the largest earthquake to occur in Utah since
a magnitude 5.9 earthquake in 1992 in southwestern Utah near St. George.
Today’s earthquake occurred in a seismically active part of the Salt
Lake Valley, where six magnitude 3.0 or larger earthquakes have
occurred since 1962. The largest of these events was a magnitude 5.2
on September 05, 1962, 0.8 mi NE of Magna, UT.

Anyone who felt the earthquake is encouraged to fill out a survey form
on the US Geological Survey website: earthquake.usgs.gov.

Earthquake Summary:

Date (UTC): March 18, 2020 Time (UTC): 13:09

Date (local): March 18, 2020 Time (local): 07:09 AM MDT

Latitude: 40 45.11′ N

Longitude: 112 4.65′ W

Depth: 10.7 km

Preferred magnitude: 5.7 USGS Mw

M 3.9 near Tremonton, UT

PRESS RELEASE
University of Utah Seismograph Stations
Released: September 24, 2019 11:00 AM MDT

The University of Utah Seismograph Stations reports that a minor earthquake of magnitude 3.9 occurred at 10:15 AM on September 24, 2019(MDT).  The epicenter of the shock was located north of the Great Salt Lake, 14 miles northwest of Tremonton, UT. 

This earthquake was reported felt throughout northern Utah including in the city of Tremonton and the surrounding communities.  A total of 45 earthquakes of magnitude 3.0 or greater have occurred within 16 miles of the epicenter of this event since 1962.  The largest of these events was a magnitude 4.5 on July 05, 1989, 11 miles west-southwest of Tremonton, UT.

Anyone who felt the earthquake is encouraged to fill out a survey form on the US Geological Survey website: earthquake.usgs.gov.

Earthquake Summary:

Date (UTC):   September 24, 2019         Time (UTC):   16:15
Date (local): September 24, 2019         Time (local): 10:15 AM MDT
Latitude:     41 48.94′ N
Longitude:    112 23.38′ W
Preferred magnitude: 3.90 Ml

2017 Annual Report

2017 Annual Report Cover Page

2017 Annual Report

I am happy to report the University of Utah Seismograph Sta- tions (UUSS) had another exciting and productive year in 2017. Thanks to all of you who support and promote our mission of reducing the risk of earthquakes in Utah through research, edu- cation, and public service.

An Mw 5.3 earthquake on Sept. 2, 2017, in southeastern Idaho reminded us that we absolutely do live in earthquake country. Thankfully, this earthquake caused little damage, but its shaking was felt throughout northern Utah, as far south as Provo. UUSS responded to the earthquake by partnering with the U.S. Geo- logical Survey and the Idaho Geological Survey to deploy a tem- porary array of seismographs in the source region. Using these data, we detected and located over 1,000 aftershocks in the two months following the mainshock. This allowed us to map out a previously unknown fault system.

UUSS also recorded enhanced seismicity in Yellowstone Na- tional Park during 2017. Between June 12 and Sept. 30, a swarm of over 2,400 earthquakes was recorded in the Maple Creek re- gion of Yellowstone. The largest event in the swarm was an Mw 4.4 earthquake on June 15 that was widely felt throughout the park. Although earthquake swarms in Yellowstone are common, this was the second longest swarm ever recorded. Yellowstone earthquake swarms are often related to the movement of fluids in the crust and usually do not portend a volcanic eruption; howev- er, it remains important to monitor them closely.

In 2017, UUSS continued working with the University of Utah team vying to host the Frontier Observatory for Research in Geo- thermal Energy (FORGE). This project is sponsored by the U. S. Dept. of Energy and aims to build a facility for developing tech- nologies related to enhanced geothermal energy production. The UUSS FORGE effort is led by Prof. Kris Pankow and is focused on quantifying the seismic hazard near the proposed FORGE site in Milford, Utah. Utah is one of two finalists for this project, and the winner will be announced in 2018.

We look forward to another exciting year in 2018. I encourage you to visit our web page at quake.utah.edu to stay up-to-date on our initiatives and products as well as to find out about the lat- est seismic activity in Utah and Yellowstone. You can also follow UUSS on Twitter with the handle @UUSSquake.

Best wishes, Keith D. Koper