Upcoming Presentations

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• Extensional Evolution of the Horse Range, Eastern Nevada

  • When
    23 Apr 2024
  •  
    5:30 PM
  • Location
    Online and in-person at Bridge 99 Brewery

  Joan Fryxell
  

  California State University, San Bernardino
  

  
  

  
  

  
  

  
  

  
  

  5:30 pm social hour

  7:00 pm presentation

  
  

  The Miocene Horse Camp Formation is exposed in the Horse Range, the eastern bounding range to Railroad Valley, NV, where oil has been produced since 1955. These sedimentary rocks are tilted up to 70°, as well as being folded. They sit on a stack of Oligocene volcanic rocks, which appear to predate extensional faulting in the area. This Miocene basin is well-exposed, providing an excellent natural laboratory for exploring the interaction of basin formation and faulting.

  
  

  Please join us at Bridge 99 Brewery:

  63063 Layton Avenue, Bend

  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.

  Show details
• From the Last Glacial Maximum to Present: New Chronologies for Oregon’s Cascade Ice Cap and Glaciers

  • When
    28 May 2024
  •  
    5:30 PM
  • Location
    Online and in-person at Bridge 99 Brewery

  

  Anders Carlson
  

  Oregon Glaciers Institute
  

  
  

  
  

  
  

  
  

  
  

  
  

  
  

  
  

  
  

  5:30 pm social hour

  7:00 pm presentation

  
  

  During the last ice age an ice cap covered much of the Oregon Cascade crest, with a north-south length roughly between that of the modern Northern and Southern Patagonia ice caps. Oregon’s ice cap stands out from other late Pleistocene ice bodies in the western United States in that its deglacial history is largely unknown. Here, we will present new Helium-3 surface exposure ages for the ice cap collected from the Three Fingered Jack and Middle Sister regions. These ages will directly date when it retreated from its last glacial maximum extent and then paused to deposit moraines close to late Holocene/historical moraines. This new chronology will allow us to relate ice-cap change to regional climate change as recorded in marine and cave temperature records. We will also have new Helium-3 ages for potential prehistoric late-Holocene moraines just outboard of historic moraines from Hayden Glacier on Middle Sister and Eliot Glacier on Mount Hood. In sum, these new ages will expand the record of cryospheric change in Oregon from less than the last 150 years, to likely more than the last 20,000 years.

  
  

  
  

  
  

  Please join us at Bridge 99 Brewery:

  63063 Layton Avenue, Bend

  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.

  Show details
• Was the 1700 Cascadia earthquake one or many ruptures?

  • When
    24 Sep 2024
  •  
    5:30 PM
  • Location
    Online and in-person at Bridge 99 Brewery

  Diego Melgar
  

  University of Oregon
  

  
  

  
  

  
  

  
  

  
  

  
  

  
  

  
  

  
  

  5:30 pm social hour

  7:00 pm presentation

  
  

  In this presentation we’ll explore a major question about the 1700 Cascadia earthquake: Was it one big earthquake, or a series of smaller ones happening close together in time? Understanding this is crucial for forecasting future earthquakes and tsunamis in the Cascadia region. Here we’ll use computer models to examine the different possibilities, using extensive historical earthquake data to rule specific scenarios as likely or not. In the end, we’ll conclude that we can't be certain if the 1700 earthquake was a single event and that the possibility that it was a sequence of earthquakes needs to be considered as equally likely.

  
  

  Please join us at Bridge 99 Brewery:

  63063 Layton Avenue, Bend

  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.

  Show details