Confluence Retirement

In an effort to consolidate USGS hosted Wikis, myUSGS’ Confluence service is scheduled for retirement on January 27th, 2023. The official USGS Wiki and collaboration space is now SharePoint. Please migrate existing spaces and content to the SharePoint platform and remove it from Confluence at your earliest convenience. If you need any additional information or have any concerns about this change, please contact myusgs@usgs.gov. Thank you for your prompt attention to this matter.

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Ralph Haugerud - Offshore map

SeanPaul La Selle - Paleo-tsunami deposits (Floras Lake and the Salmon River) 

We are continuing work in coastal lakes in Southern Oregon (Floras and Bradley).  Deeper cores from Floras Lake were collected in FY18 and the analyses and dating of these cores are a priority for FY19, along with refining the ages of Bradley Lake tsunami deposits using new dating techniques.  Work on onshore subsidence estimates is still ongoing at sites along the central and northern Oregon coast (Siuslaw River and Nehalem Bay).  Models of tsunami inundation and sediment transport will be further developed for the Salmon River and Floras Lake in FY19. 

Jon Perkins – Mendenhall proposal, coseismic landslide work

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Brian Sherrod – Olympic Peninsula uplift

Tom Brocher – 1873 Crescent City earthquake and compilation of Cascadia wide angle seismic profiles for a – 

The 2018 Corvallis workshop on building a new Cascadia 3D seismic model identified a need for review papers highlighting existing data and interpretations.  In this map Tom Brocher has summarized the locations of 34 individual controlled-source wide-angle seismic imaging experiments dating to the 1960s.  Together, they provide 40 million independent ray paths sampling the subsurface. There are important gaps in these surveys in northern and southern Oregon.  The locations of all these experiments will be supplied for the project database. 

View file
nameCascadia Wide Angle Seismic (1).pdf
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1873 Crescent City earthquake:
The location of this earthquake is very uncertain:  could it be a megathrust event?  Tom Brocher has been working in newspaper archives to uncover new accounts of the earthquake to update the ShakeMap for this earthquake.  There are few felt reports of the earthquake south of the southern edge of the Gorda slab and really no reports of aftershocks.  Tom thinks the best interpretation of these observations is that the earthquake occurred within the slab underneath the Oregon-Washington border.  Such inslab earthquakes produce few aftershocks and the slab provides an efficient waveguide for seismic waves.

Lydia Staisch  -  Coastal uplift rates

Lydia Staisch - coastal uplift rates in SW washington

Janet Watt or Maureen Walton (10-15 min) - CMG activities

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