|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 Corvallis workshop report is attached (click on paperclip at the top of the page).|
|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 ratesLydia Staisch - Staisch described her work on coastal uplift rates in SW southwest washington.
Janet Watt or Maureen Walton (10-15 min) - CMG activitiesdescribed CMG past and planned activities, as follows:
Erin Wirth Erin updated us everyone on the M9 project, noting there are 2 recently published papers on M9 ground motion simulations (see Frankel et al., Wirth et al.). The simulation output is available on DesignSafe. The City of Seattle has revised design recommendations for tall buildings in the Seattle basin based on their results (see OFR report). The M9 Project Final Workshop will be Tuesday, March 12, 2019 @ UW; contact Erin if interested in attending.
Listeners - Bruce Jaffe (late?)
Unable to attend - Stephanie Ross, Bill Schulz and Nathan Miller, others? Erin's presentation may be downloaded (see paperclip at the top of the page).
Tentatively we will have another online meeting toward the end of January and an in-person meeting before or after the SSA meeting in Seattle, in April, 2019.