Looking up the avalanche chute along Henson Creek in Hinsdale County 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 of snow-and-rock avalanches as a means of forming rock glaciers Jon Lovekin, one of our engineering geologists will make a Zoom presentation on the unprecedented geohazard that unfolded during the…
The end result of the current trenching on the Cheraw fault Geology, 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 the state. While not seen as a seismically active region by most people, Colorado does have its share of geologic faults and historical earthquake activity. The state has over 90…
General December 13, 2019 Quote: Robert Frost, geohazards expert Not only sands and gravels Were once more on their travels, But gulping muddy gallons Great boulders off their balance Bumped heads together dully And started down the gully. Whole capes caked off in slices. I felt my standpoint shaken…
Soil arch in Qamf deposit, Loutzenhizer Arroyo. Piping cave/soil arch in Qamf deposit, Loutzenhizer Arroyo, Delta County, Colorado, April 2007. Photo credit: David Noe (CGS). Hazards July 12, 2018 Collapsible Soils By Jonathan White, Senior Engineering Geologist, Emeritus At the end of the 19th and beginning of the 20th Century, some of the first settlers of the plateau region of western Colorado along the Colorado River, and the Uncompahgre and North Fork of…
Hazards December 30, 2017 Swelling or expansive soils Colorado has many areas susceptible to the problems that swelling soils cause. This video gives some background on the problem.
MI-97 LiDAR-Based Map of the Cheraw Fault Scarp. Graphic credit: Colorado Geological Survey Hazards September 12, 2017 AEG Annual Meeting Members of our geoscience staff are busy this week participating in the Annual Meeting of the Association of Environmental & Engineering Geologists taking place in Colorado Springs this year. CGS Director and State Geologist, Karen Berry, PG, is the Technical Session Moderator, the organizer of…
Dramatic landslide headscarp threatens this structure on Constellation Drive in Skyway Hazards August 14, 2017 Landslide Hazard Info for Colorado Springs Residents and Real Estate Professionals The city of Colorado Springs lies at the boundary between the Great Plains and the Front Range of the southern Rocky Mountains. Western sections of the city are underlain by weak claystones and shales that are prone to landslides. Several developed areas have experienced various degrees of damage from landslide…
The Great Colorado ShakeOut - Drop-Cover-Hold On! 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 a history of earthquake activity. Identifying potential hazards ahead of time and advance planning can reduce the dangers of serious injury or loss of life from an earthquake. Repairing deep…
West Salt Creek rock avalanche viewed from the air General, Hazards, Publications 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. Frye Memorial Award for 2017 is granted to the CGS and the staff members who authored the report The West Salt Creek Landslide: A Catastrophic Rockslide…
Trimble Ref-Tek 151-30 Broadband Seismometer in subsurface housing 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 the state and the region. The CGS seismic network acts in conjunction with those maintained by the University of Colorado and Colorado State University, the Incorporated Research Institutions for…
Figure 03. Highly contorted sedimentary strata in the evaporitic terrain between Gypsum and Glenwood Springs Hazards May 5, 2015 Evaporite Karst Subsidence [ED: Originally written by Jonathan White, Senior Engineering Geologist (emeritus staff) for a 2001 volume of our paper RockTalk bulletin, this short introduction reveals some special geological areas of the state worthy of notice for a variety of reasons.] Many areas of Colorado are underlain…
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 international subsidence experts to discuss subsidence problems worldwide at the annual meeting of UNESCO Land Subsidence working group. The video below features Gilles Erkens, subsidence expert…