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General

Brian Sherrod – FY18 summary, FY19 plans

More work on Olympic Peninsula uplift in FY19.  FY18 work with UW. FY19 large paleoseismology project between the GSHG and ESC.  Janet Watt's work.  Cascadia workshop in Seattle, similar to past N. California 

Joan Gomberg – SZ4D RCNs, SZ Communications Plan update

Lydia Staisch (10-15 min) - Powell Center project overall

Lydia outlined topics of four workshops over the next few years.  The first one will be in March, focused on the earthquake cycle broadly. She also updated us on work on the development of the CR database.

All – other general news

 

FY18 summary, FY19 plans:

Maureen Walton – Powell Center March workshop

Maureen is new PC post-doc.  March workshop in Fort Collins

Scott Bennett – backarc and Olympic Mtn geologic studies

Described FY18 Canyon River fault mapping, including 2 trenches.  In FY19 will publish SIM conveying FY18 results, analyze new lidar and do some Coulomb modeling.  

new 3D seismic velocity model

Andy  Cyr – Landslide Mendenhall proposal

4 Mendenhalls will be funded by the NHMA.  Please advertise!!!!

Art Frankel – Seattle basin studies

Chris Goldfinger - Thoughts on automated turbidite analysis 

Joan Gomberg – Land-level change Mendenhall proposal, turbidite analysis update

Ruth Harris – Tsunami Powell Center Oct 1-5 workshop (focused on Alaskan tsunamis)

Emphasized need for a logic tree approach.  Workshop highlighted need for databasing information (wrt Alaska, but lesson is relevant to Cascadia). Final workshop is focused on other sources in the Pacific; some advocating another Cascadia-only focused workshop.

Ralph Haugerud - Offshore map

SeanPaul La Selle - 

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

Alan Nelson - Re-dating Bradley Lake cores

Jay Patton – geodesy in southern Cascadia

Brian Sherrod – Olympic Peninsula uplift

Tom Brocher – 


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.


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

Erin Wirth – M9 update

 

Listeners - Bruce Jaffe (late?)

 

Unable to attend - Stephanie Ross, Bill Schulz and Nathan Miller, others?


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