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• The Most Recent Earthquake on the Mount Hood Fault Zone, Oregon: Implications for cascading earthquake, landslide, & flood multi-hazards in the Columbia River Gorge

  • When
    28 Mar 2023
  •  
    7:00 PM
  • Location
    Online and in-person at Bridge 99 Brewery

  Scott Bennett
  

  U.S. Geological Survey

  
  

  
  

  
  

  click HERE to register for Zoom

  
  

  
  

  
  

  The Mount Hood fault zone is a N-trending, ~55 km-long zone of active faulting along the western margin of the High Cascades graben at the crest of the Oregon Cascade Range. Recent geologic mapping, fault scarp analysis, and a hand-dug paleoseismic trench on the Gate Creek fault, the northernmost segment of the Mount Hood fault zone, indicate the most recent earthquake occurred between AD 1363 and AD 1495. These dates overlap with tree-ring dates between AD 1446 and AD 1447 from trees drowned when the nearby Bonneville landslide blocked the Columbia River and impounded a lake 75 meters deep. The impounded lake then partly breached the landslide dam, causing downstream flooding in the Portland basin prior to AD 1479–1482.

  Ground motion modeling of a magnitude ~7 earthquake along the Mount Hood fault zone suggests strong shaking at Table Mountain, the headscarp of the Bonneville landslide ~15 km west of the Mount Hood fault zone, could have initiated the landslide. Thus, it is possible that an earthquake in the 15th century along the Mount Hood fault zone could have triggered a cascade of hazards, including the earthquake itself, an earthquake-triggered landslide, and then a flood from breaching of the landslide dam.

  
  

  

  
  

  We have returned to in-person presentations!
  

  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.

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• In the Shadow of Volcanoes

  • When
    25 Apr 2023
  •  
    7:00 PM
  • Location
    Online and in-person at Bridge 99 Brewery

  Nick Famoso
  

  National Park Service

  
  

  
  

  
  

  
  

  
  

  
  

  It is clear that ecosystems are devastated after a volcanic eruption coats the landscape with a layer of ash; however, the ecological recovery of mammalian communities after eruptions is poorly understood. Volcanic eruptions vary with magnitude and type and only a fraction of them have been analyzed for effects on mammalian communities. In this talk we will explore how mammalian species change across volcanic boundaries by looking at three volcanic eruptions: the 1980 Mount St. Helens eruption sheds light on short term recovery after a moderate sized eruption; the 1914-1917 Mount Lassen eruption permits an analysis of long-term impacts from a relatively small eruption; and the Picture Gorge Ignimbrite (28.7 Ma) within the Turtle Cove Member of the John Day Formation was a supervolcanic eruption associated with the Yellowstone hotspot.

  
  

  
  

  
  

  We have returned to in-person presentations!
  

  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
• Looking down to look ahead: How Oregon’s fossil rodents can help us understand the impacts of past and future climate change

  • When
    23 May 2023
  •  
    7:00 PM
  • Location
    Online and in-person at Bridge 99 Brewery

  Sam Hopkins
  

  University of Oregon
  

  
  

  
  

  
  

  
  

  
  

  
  

  
  

  
  

  
  

  The ongoing human-mediated changes to climate and habitat are taking us into unknown territory, and there is a real need to understand what we can expect in ecosystem responses. The fossil record provides some important evidence to allow us to forecast ecosystem responses to environmental change, and small mammals in particular offer sensitive barometers of ecological change. Oregon’s rich record of fossil rodents over the last 30 million years gives us an opportunity to understand how these smallest mammalian residents react to the dynamic Oregon landscape, and to guess at how future ecosystem change might drive further faunal change.

  
  

  We have returned to in-person presentations!
  

  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