Hazards
October 14, 2021
The Great Colorado ShakeOut
The Great Colorado ShakeOut is an annual earthquake drill that takes place every October across…
Hazards
Hazards
June 23, 2021
HAZ-2021-01 Post-wildfire Hazards
Noting that we were getting hundreds of search hits on a previous version of an info-brochure that we originally published…
Hazards
February 8, 2021
The Snowy Torrents
Here in Colorado, avalanche season is not over yet, and it’s been another deadly one with 26 fatalities so far…
Hazards
October 13, 2020
Seismometer installed on campus
Mines students partner with the CGS to install seismometer on campus Colorado School of Mines geophysics students enrolled…
Hazards
July 14, 2020
Colorado Scientific Society lecture online
TITLE: Historic Avalanches in Hinsdale County, Colorado: Impacts to Lake City, old mining dams, and new evidence for the association…
Hazards
March 20, 2020
Trenching the Cheraw Fault in Southeastern Colorado
One of the missions of the CGS is to better understand the various geological risks that face the residents of…
Hazards
July 12, 2018
Collapsible Soils
By Jonathan White, Senior Engineering Geologist, Emeritus At the end of the 19th and beginning of…
Hazards
January 24, 2018
Subsidence (Water Education Foundation)
Hazards
December 30, 2017
Swelling or expansive soils
Colorado has many areas susceptible to the problems that swelling soils cause. This video gives some…
Hazards
September 12, 2017
AEG Annual Meeting
Members of our geoscience staff are busy this week participating in the Annual Meeting of the…
Hazards
August 14, 2017
Landslide Hazard Info for Colorado Springs Residents and Real Estate Professionals
Dramatic landslide headscarp threatens this structure on Constellation Drive in Skyway, Colorado Springs, Colorado, May 2017. Photo credit: Jon Lovekin,…
Hazards
July 9, 2017
What to do before, during, and after an earthquake
Earthquakes strike suddenly, violently, and without warning. While Colorado is not as seismically active as some places, it does have…
Hazards
May 16, 2017
AASG 2017 John C. Frye Memorial Award for CGS publication
The Association of American State Geologists announced that their annual John C.
Hazards
January 23, 2017
Top-Ten paper at GSA
On May 25, 2014 the longest landslide in Colorado’s historical record occurred in west-central Colorado, six miles southeast of the small town of…
Hazards
September 3, 2016
CGS seismometer array
The CGS recently installed the first of five new seismic recording stations that will collect information on seismic events around…
Hazards
May 5, 2015
Evaporite Karst Subsidence
[ED: Originally written by Jonathan White, Senior Engineering Geologist (emeritus staff) for a 2001 volume of…
Hazards
March 4, 2015
Land subsidence, a growing problem
Deltares, an independent institute for applied research in the field of water and subsurface, hosted fifteen…
Hazards
March 13, 2013
The Science of Sinkholes
This video, from the U.S. Geological Survey, explores the geological factors behind sinkholes and the related science. Narrated by Randall…
Hazards
August 22, 2011
Case Study: The Trinidad, Colorado Earthquakes
[ED: Originally published in 2011 by Vincent Matthews, former State Geologist at the CGS.] Around midnight on August 22,…
Hazards
June 15, 2011
Mine Subsidence Hazards in Colorado
This video, produced by the CGS in 2011, examines the significant geo-hazards related to the long history of underground coal…
Hazards
February 10, 2011
Hazardous Soils in Colorado
This educational video, produced in 2011, explores the various problems that arise from hazardous soil conditions — expansive, collapsible/compressible, hydrocompactive,…
Hazards
July 10, 2009
Case Study: Rockfall – St. Francis of Assisi, Castle Rock
The CGS studied the site of St. Francis of Assisi Church in Castle Rock extensively after a block detached from…
Hazards
July 6, 2005
Case Study: Rockfall – Glenwood Springs
The town of Glenwood Springs in west-central Colorado lies at the confluence of the Roaring Fork and Colorado rivers.
Hazards
January 17, 2005
Case Study: Roaring Fork sinkhole
[ED: This report from January 17, 2005 was written by Jon White, (Senior Engineering Geologist, Emeritus). Lightly edited for dated…
Hazards
March 23, 2003
Case Study: Avalanche – Silver Plume
On March 23, 2003, a large avalanche occurred about one mile west of the Town of Silver Plume. The avalanche brought trees, rock, soil and snow to the valley floor, knocked down overhead utility lines, blocked the I-70 frontage road, damaged the town’s water treatment plant (WTP), and dammed Clear Creek. The dam was breached using explosives before the plant’s electric pump motors were flooded. With damage to the WTP’s chlorine contact tank and building, Silver Plume residents had to boil their tap water for over a month.
Hazards
September 26, 2001
Swelling Soil Publication Wins Another National Award
CGS Special Publication 43, SP-43 A Guide to Swelling Soils for Colorado Homebuyers and Homeowners, by…
Hazards
June 19, 1995
Case Study: Rockfall – Manitou Springs
by Jon White Manitou Springs occupies a narrow valley where Fountain Creek emerges from the foothills northeast of Pikes Peak and west of Colorado Springs. The valley slopes are composed of interbedded resistant sandstone and conglomerates (i.e., gravelly sandstone), and weaker mudstones and shale. The outcropping sandstone is most prevalent on the steeper slopes on the north side of the valley.
Hazards
November 20, 1980