Let's talk about Mount Jefferson (28 Apr 2026)

Wed, 29 Apr 2026 00:30:00 GMT

David Sherrod

U.S. Geological Survey

Click HERE to register for Zoom

Compare the four major, potentially active, Oregon Cascade Range composite volcanoes. Ski lifts take enthusiasts high onto the south slope of Mount Hood. One can climb South Sister in the summer and be back in town in time for an early afternoon beer. Crater Lake allows vehicle access to nearly the highest points of the entire volcano. But the fourth, Mount Jefferson? Much less well known is its volcanic, glacial, and modern debris-fan history. Let's talk about Mount Jefferson.

Please join us at:

Worthy Brewing (eastside location)

495 NE Bellevue Drive, Bend

In the Hop Mahal Room

5:30 pm social hour

7:00 pm presentation

COGS talk are free and open to the public -- all are welcome! Please join us for the social hour before the presentation.

All presentations are also live-streamed through Zoom. There will be a registration link at the top of this page as we get closer to the date of this presentation.

Axial Seamount: The Hidden Active Volcano in the Pacific Northwest (26 May 2026)

Wed, 27 May 2026 00:30:00 GMT

Bill Chadwick

Hatfield Marine Science Center, Oregon State University

Axial Seamount is an active submarine volcano located ~300 miles offshore Oregon and about a mile below the ocean surface. It has erupted 3 times in the last 30 years, making it the most active volcano in the Pacific Northwest (even though you can't see it!). It is monitored in real-time by seafloor instruments connected to a cabled observatory. Data from that monitoring network suggest that the volcano is building toward its next eruption. This talk will describe the most recent monitoring data and its implications for forecasting the next eruption.