Hazards

Case study: Fluvial Hazard Zone

“The Fluvial Hazard Zone (FHZ) is defined as the area a stream has occupied in recent history, may occupy, or…

The Great Colorado ShakeOut 2022

It’s coming up in less than four weeks! The Great Colorado ShakeOut is a public earthquake drill that takes place…

The Great ShakeOut

The origins of The Great ShakeOut project lie, unsurprisingly, in Southern California, one of the more…

Case Study: NARD

Are pristine mountain waters always clean and pure? Can streams unaffected by human activities and livestock influences be unfit…

Case Study: Lykins Formation

Small but significant areas of Colorado are underlain by bedrock that is composed of evaporative…

CGS Seismic Stations

Early History The Colorado School of Mines first acquired and installed a single three-component seismograph in the…

Case Study: stormwater

Stormwater runoff is excess water associated with a rain or snow storm event that flows over the…

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…

The Snowy Torrents

Here in Colorado, avalanche season is not over yet, and it’s been another deadly one with 26 fatalities so far…

Seismometer installed on campus

Mines students partner with the CGS to install seismometer on campus Colorado School of Mines geophysics students enrolled…

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…

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…

Collapsible Soils

By Jonathan White, Senior Engineering Geologist, Emeritus At the end of the 19th and beginning of…

Subsidence (Water Education Foundation)

Swelling or expansive soils

Colorado has many areas susceptible to the problems that swelling soils cause. This video gives some…

AEG Annual Meeting

Members of our geoscience staff are busy this week participating in the Annual Meeting of the…

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,…

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…

AASG 2017 John C. Frye Memorial Award for CGS publication

The Association of American State Geologists announced that their annual John C.

Top-Ten paper at GSA

On May 25, 2014 the longest landslide in Colorado’s historical record occurred in west-central Colorado, six miles (10 km) southeast of the small…

CGS seismometer array

The CGS recently installed the first of five new seismic recording stations that will collect information on seismic events…

Evaporite Karst Subsidence

[ED: Originally written by Jonathan White, Senior Engineering Geologist (emeritus staff) for a 2001 volume of…

Land subsidence, a growing problem

Deltares, an independent institute for applied research in the field of water and subsurface, hosted fifteen…

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…

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,…

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…

Hazardous Soils in Colorado

This educational video, produced in 2011, explores the various problems that arise from hazardous soil conditions — expansive, collapsible/compressible,  hydrocompactive,…

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…

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.

Case Study: Clear Creek Canyon rockslide

Rockfalls and rock slides are common along transportation corridors in the Rocky Mountains. Clear Creek Canyon just west of Golden…