M 4.3 Near Bedrock, CO

PRESS RELEASE

University of Utah Seismograph Stations

Released: December 19, 2020 08:00 PM MST

The University of Utah Seismograph Stations reports that a light earthquake of magnitude 4.3 occurred at 07:11 PM on December 19, 2020 (MST).  The epicenter of the shock was located south of Paradox Valley in western Colorado, 3.5 miles southwest of the town of Bedrock, Colorado, and 18 miles east of the town of La Sal, Utah.  It was reported felt in Bedrock and in Moab, Utah. A magnitude 3.3 foreshock occurred at 6:53 PM (MST).  Today’s earthquakes occurred within an area of frequent small, shallow earthquake activity triggered by underground saltwater injection. Before today, a total of 12 earthquakes of magnitude 3.0 or greater had occurred within 16 mi of the epicenter of this event since 1997, including three earlier this year:  a magnitude 3.4 on September 16, a magnitude 3.8 on November 8, and a magnitude 3.7 on December 8.  The largest earthquake since 1962 in the area of today’s earthquake was a magnitude 4.5 on March 4, 2019.

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):   December 20, 2020         Time (UTC):   02:11

Date (local): December 19, 2020         Time (local): 07:11 PM MST

Latitude:     38 16.37′ N

Longitude:    108 55.70′ W

Preferred magnitude: 4.30 Ml

M 3.7 Near Bedrock, CO

PRESS RELEASE

University of Utah Seismograph Stations

Released: December 08, 2020 05:00 PM MST

The University of Utah Seismograph Stations reports that a minor earthquake of magnitude 3.7 occurred at 03:53 PM on December 08, 2020 (MST).  The epicenter of the shock was located in western Colorado, 3 miles south-southwest of the town of Bedrock, Colorado, and 18 mi east of the town of La Sal, Utah.  This earthquake occurred within an area of frequent small, shallow earthquake activity triggered by underground saltwater injection. A total of 10 earthquakes of magnitude 3.0 or greater have occurred within 15 miles of the epicenter of this event since 1997, including two earlier this year:  a magnitude 3.4 on September 16 and a magnitude 3.8 on November 8.  The largest earthquake since 1962 in the area of today’s earthquake was a magnitude 4.5 on March 4, 2019.

Anyone who felt the earthquake is encouraged to fill out a survey form either on the Seismograph Stations website: www.quake.utah.edu or the US Geological Survey website: earthquake.usgs.gov.

Earthquake Summary:

Date (UTC):   December 08, 2020         Time (UTC):   22:53

Date (local): December 08, 2020         Time (local): 03:53 PM MST

Latitude:     38 16.32′ N

Longitude:    108 55.38′ W

Magnitude:    ML 3.7