COGS is a Central Oregon-based non-profit organization promoting a greater awareness and understanding of the geological sciences through technical presentations, educational outreach to schools, and field trips


Upcoming Presentation



 Join COGS and Chris Goldfinger on the 321-year anniversary of the last Cascadia earthquake (January 26, 1700)

Click HERE for required advanced Zoom registration


Tuesday, January 26th - Online Zoom Presentation

                          6:45PM "doors" open  <->  7:00PM presentation


Chris Goldfinger
, Oregon State University

The Next Great Cascadia Earthquake - How did we get here?

Our understanding of plate tectonics is only about 60 years old, and we are still low on the Earth's learning curve. Cascadia earthquakes helped usher in a new hypothesis of everything, but then was forgotten for many years. More recently, our understanding of Cascadia earthquakes suddenly went from unknown, to a potential generator of M9 earthquakes in just a few short years. How did this happen, and what does the future hold?

OPB article: The Big One, Times 2: Research Shows Cascadia Quakes Sometimes Trigger San Andreas Fault 

Oregon Field Guide: Unprepared: An Oregon Field Guide Special





Prepare for Chris Goldfinger's presentation by watching this new video  

Ghost Forests—Evidence for a Giant Earthquake & Tsunami in the Pacific Northwest

Watch Earlier Presentations

Click HERE for Past Presentations

In accordance with the continuing evolution of Governor Brown's executive orders, we have suspended field trips through 2020. 


Geoscience Events & Activities by Others

2021 Bretz Club Mini-Conference

After the Burn: Post-Fire Geomorphology in the Pacific Northwest

January 19, 2021

2:30 - 4:30 pm (Pacific time)

Join us for an afternoon of talks and networking around post-fire geomorphology in the Pacific Northwest! We will have four speakers discussing the science, efforts, and potential studies that have presented themselves after this year of infrequently-occurring large fires.

Registration is required: REGISTER HERE.

Friday February 12th Zoom Lecture

Bill Burgel

Central American vs. Cascadian Volcanoes

click HERE for details

February 13, 2021

Exhibition Opening: “Cosmic Microscapes: Seeing into Rocks from Oregon and Space”

This exhibition blends art and science to reveal the breathtaking beauty of meteorites—rocks from space!