Tuesday • November 15th 2022 • 5:30 PM

Location: Old Market Pub and Brewery

6959 SW Multnomah Blvd, Portland, OR 97223




5:30 – 6:30 pm (Social)

6:30 – 7:00 pm (Dinner)

7:00 pm (Presentation)


Tuesday • December 13th 2022 • 5:30 PM

Presentation Topic:

New Data on the Timing of Recent Geologic Events of the Past Two Millennia in Cascadia from Radiocarbon and Tree-ring Analysis: Examples, Lessons Learned, and Future Potential

This talk will delve into the multiple uses of dendrochronology in the Pacific Northwest, with examples used to date the Old Maid eruption of Mount Hood (late 1781), Bonneville landslide (1446-1447 during dormancy), Mount Rainier Electron mudflow (late 1507), and Seattle and Saddle Mountain faults (923-924). There are many landslide dammed lakes in Washington, many of which we have radiocarbon ages on and that contain drowned subfossil trees could well be dated with dendrochronology.

Presentation Speaker: Pat Pringle

Pat taught at Centralia College from 2005 through 2017. From 1990 to 2005 he was a Research Geologist with the Washington Department of Natural Resources Division of Geology and Earth Resources (now the Washington Geological Survey), and from 1982 to 1990 was with the US Geologcal Survey Cascades Volcano Observatory in the volcanic hazards program. His main areas of study are volcanoes, earthquakes, landslide, and debris flows, which he studies using radiocarbon and tree-ring analysis to establish the history of past geologic events. His publications include published papers, curricula, and books on the roadside geology of Mounts St. Helens and Rainier. He has received several teaching awards including Washington Association of College Trustees Faculty Member of the Year in 2016.

Message from the Chair

October, 2022

Hello Oregon Chapter!

Hello Oregon Chapter!
The fall rains have finally arrived and it feels like field work might finally be wrapping up for the season (the planned, non-emergency field work anyway). It’s a perfect time to grab a slice of pizza and a beverage of your choice and come swap field work horror stories with your fellow geologists. Of course, we’ll have to keep an eye on COVID case counts, guidance, etc., but we’re cautiously optimistic that we will be able to continue meeting in person through the winter. We will continue running hybrid meetings, so even if you get sick or get sucked into out-of-town field work there is no excuse for not attending! I logged into October’s virtual meeting from Missouri and I would say our board did a pretty solid job. Please let me know if you have any feedback or suggestions to help with the hybrid style, and we’ll do what we can to adjust.

Last month we had a great presentation from Christoph Kern of USGS on the intricacies of monitoring active volcanoes, specifically by monitoring gas emissions. I know it was part of the introduction, and almost an aside, but one of the things that stuck with me from Chris’ talk was that he originally planned to study urban air pollution. The job he had lined up after graduation fell apart, and he took a job with USGS to monitor volcanic emissions almost at random, without any certainty that monitoring emissions would yield useful data. It was a good reminder that our professional lives can have all kinds of twists and turns on the way to fulfilling careers in the geosciences.

We’re excited to follow up Chris’ talk on predicting volcanic eruptions with another disaster-tinged talk on dating landslides. Way back in September, Pat Pringle had to postpone his planned presentation. We’re excited that he was able to reschedule to November and will bring us up to speed on using radiocarbon and tree-ring data to better date recent geologic events in Cascadia.

We’re looking forward to squeezing this meeting in before the Thanksgiving holiday, practicing for the holiday feast with some pizza and salad. In the meantime, membership renewal reminders have been going out. If you’re not already a member, now is the perfect time to join. Let me know if you need help with renewal or new membership.

See you all soon,
Aine Mines
AEG Oregon Chapter Chair 2022-2023

Interested in presenting for the oregon chapter?

The Oregon Chapter is looking for great topics and presenters to provide content to share with the chapter. As we continue to navigate the virtual world, we will be holding the next foreseeable meetings through webinars. We currently have opportunities to present in November and December. Please consider presenting your exciting project to the Oregon Chapter. We look forward to hearing from all of you and especially appreciative of those willing to present to the Chapter. If you are interested in presenting please feel free to contact any board member. Our contact information is at the end of the newsletter.

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