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

1930 – Grover, WY – M 5.8

Intermountain Seismic Belt Historical Earthquake Project

June 12, 1930 – Grover, WY – M 5.8

In the early hours of Thursday, June 12, 1930, a magnitude 5.8 earthquake occurred in Grover, Wyoming—approximately 10 miles north of Afton, Wyoming.

The shock was widely felt in the community of Grover. Loud noise accompanied the earthquake. Cracking occurred in a building and a swimming pool in the community. Cracks in plaster were also reported (Neumann & Bodle, 1932)

The earthquake was felt in Star Valley, Wyoming, where residents were awakened when their houses began shaking.

No injuries from this earthquake were reported.



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1876 – Moroni, UT – M 5.0

Intermountain Seismic Belt Historical Earthquake Project

March 22, 1876 – Moroni, UT – M 5.0

A magnitude 5.0 earthquake occurred in Moroni, Utah on Wednesday, March 22, 1876. The earthquake was felt over an area of 1158 square miles. This is approximately two-thirds of the area of Sanpete County, Utah—the county in which the earthquake occurred. Reports indicate that earthquakes were felt in Sanpete County over the course of several days.

A report from Mt. Pleasant, Utah said that the shaking frightened people, some of whom ran into the street screaming. Reported damage consisted of cracked walls and falling plaster. The porch of one house fell.

No injuries were reported.



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1933 – Parowan, UT – M 5.0

Intermountain Seismic Belt Historical Earthquake Project

January 20, 1933 – Parowan, UT – M 5.0

On Friday, January 20, 1933, a magnitude 5.0 earthquake occurred in Parowan, UT. The earthquake was reported felt in Panguitch, Utah (approximately 21 miles west of Parowan) and Paragonah, Utah (approximately 4 miles southeast of Parowan).

A report from Paragonah indicated that the shaking excited the community but caused no significant damage. In Panguitch, the earthquake shook buildings and rattled windows and wall hangings. There was also a report that some light meters in the city roared due to atmospheric disturbances accompanying the earthquake.

There were no injuries or significant damage reported.



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1910 – Salt Lake City, UT – M 5½ ±

Intermountain Seismic Belt Historical Earthquake Project

May 22, 1910 – Salt Lake City, UT – M 5½ ±

On Sunday, May 22, 1910, at 7:28 a.m. local time, a magnitude 5½ ± earthquake struck Salt Lake City, Utah. At the time, it was the most severe earthquake recorded in the city’s history. Shaking was also distinctly felt in the Utah communities of Tooele, Nephi, Garfield and Bingham; and to a lesser degree in Ogden, Utah.

Frightened people ran from buildings. Some believed that Halley’s Comet had struck the earth. Others thought the end of the world had come. One switchboard in the Salt Lake City reported receiving 5,000 calls in the first 20 minutes of ground shaking. 

There were reports that buildings swayed and houses rocked throughout the city. Light fixtures swung and windows rattled. Books fell from cases, goods were shaken from store shelves, clocks stopped and horses broke out of their stables.

Damage consisted of toppled chimneys, cracked walls and ceilings, falling plaster, and broken mirrors and dishes. The shaking loosened joints in a main gas line, causing severe leaks. One house was damaged when loosened bricks fell through the ceiling.

Though no injuries occurred and damage was minimal, the severe shaking had a sobering effect on the community.



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1958 – Wallsburg, UT – M 5.0

Intermountain Seismic Belt Historical Earthquake Project

February 13, 1958 – Wallsburg, UT – M 5.0

The 1958 Wallsburg, Utah earthquake occurred February 13 at 3:52 p.m. (local time). The epicenter was approximately 10 miles south of Heber City, Utah, in the mountains of the Wasatch Range. The earthquake was generally felt throughout Utah Valley—to the west of the Wasatch Range.

The earthquake was felt strongly in Provo, Utah. Buildings shook and swayed. Furniture and office equipment skidded across floors. Light fixtures swung back and forth. Windows and dishes rattled.

Reported damage included cracked walls and ceilings, and falling plaster. No observable damage occurred to water lines or city pavements.

No injuries from this earthquake were reported.



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1967 – Marysvale, UT – M 5.2

Intermountain Seismic Belt Historical Earthquake Project

October 4, 1967 – Marysvale, UT – M 5.2

In the early morning of October 4, 1967, shaking from a magnitude 5.2 earthquake awakened residents of south central Utah.

The earthquake was reported felt in the communities of Marysvale, Richfield, Bicknell, Beaver, Koosharem and Burrville, Utah. There were no reports of injuries.

A resident from Bicknell reported that stairs shook, windows rattled and closet doors were banging. Reports from Richfield indicated that walls shook, goods fell from store shelves, and a sound like thunder could be heard accompanying the earthquake.

Damage consisted of cracks in walls, broken jars and bottles, and fixtures shaken off mountings.

The earthquake also triggered a minor rockslide on U.S. Route 89 in Marysvale Canyon.



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1908 – Milford, UT – M 5.0

Intermountain Seismic Belt Historical Earthquake Project

April 15, 1908 – Milford, UT – M 5.0

The 1908 Milford, Utah earthquake occurred the evening of Wednesday, April 15. Two newspaper articles reported that the shaking occurred at approximately 8:30 p.m. local time.

The shaking was reportedly most severe in the Utah communities of Milford and Newhouse. The earthquake was also felt in Beaver, Utah. The earthquake was not recorded by seismograph instrumentation in Salt Lake City, Utah.

A roaring sound preceded the shaking according to one report. People ran into streets. Some fainted. Many people experienced a sensation of seasickness due to the earth movement. No fatalities were reported.

Houses shook and windows rattled. Glassware fell from shelves. One person in Milford reported that bureau drawers opened from the force of the shaking. One report expressed the likelihood that damage had occurred inside most homes in the Milford area.

There was also a report of gas being emitted from Mt. Baldy, located northeast of Beaver.



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M 3.5 near southern boundary of Yellowstone National Park

University of Utah Seismograph Stations

Released: August 15, 2019 02:30 PM MDT


The University of Utah Seismograph Stations reports that a minor earthquake of magnitude 3.5 occurred at 01:46 PM on August 15, 2019 (MDT).  The epicenter was located on the southern boundary of Yellowstone National Park,  22.2 miles southeast of West Thumb Geyser Basin and 48.7 miles northeast of Jackson, WY.  Earthquake activity in this location is not unusual.  A total of 9 earthquakes of magnitude 3.0 or greater have occurred since 1962 within 16 miles of todays earthquake.  The largest of these events was a magnitude 4.3 on August 21, 2003 located 22.5 miles south-southeast of West Thumb Geyser Basin and 44.2 miles north-northeast of Jackson, WY.

There have been no felt reports for todays earthquake at the time of this writing.  Anyone who felt the earthquake is encouraged to fill out a survey form either on the University of Utah Seismograph Stations website: www.quake.utah.edu or the U.S. Geological Surveys website: earthquake.usgs.gov.

Earthquake Summary:
Date (UTC): August 15, 2019 Time (UTC): 19:46
Date (local): August 15, 2019 Time (local): 01:46 PM MDT
Latudute: 44 7.66’ N
Longitude: 110 22.73’ W
Preferred magnitude: 3.5 Ml

1945 – Central Idaho – M 6.0

Intermountain Seismic Belt Historical Earthquake Project

February 13, 1945 – Central Idaho – M 6.0

The second large earthquake to strike Central Idaho in less than a year, occurred Tuesday, February 13 at 8:01 p.m. (local time). The earthquake, located approximately 25 miles west northwest of Custer, Idaho, caused buildings and light fixtures to sway, and rattled dishes and window blinds. No injuries or significant damage were reported.

The earthquake was reported generally felt throughout central and north Idaho and southeastern Washington. Felt reports were received from the Idaho communities of Moscow, Boise, Lewiston, Star, Eagle, and Cascade; and from Spokane, Washington and Seattle, Washington.

Telephone switchboards at radio stations, fire stations, police departments and newspaper offices in Boise were flooded with calls.

One newspaper reported, in jest, that the earth tremors might be the result of comments made by Soviet Premier Joseph Stalin to British Prime Minister Winston Churchill and U.S. President Franklin D. Roosevelt during the Yalta Conference held in the Soviet Union, February 4-11, 1945.



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ISB Hist EQ Proj