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Roger Patrick Denlinger, Ph.D.

My interests are in the physics of volcanoes; the processes that cause the changes that we measure and phenomena we see. This includes the mechanisms of magma transport, volcanic structure and magma storage, and during eruptions the transport of ash in the atmosphere. I use numerical methods, including artificial intelligence, to model data, and Bayesian methods to constrain the models with data.

I have been a Geophysicist with the Cascades Volcano Observatory since 1996. My major accomplishments are as follows:

  • Constructed a model for shallow water flow, modeled floods throughout western US
  • Showed that a 2d shallow water model effectively modeled two millennial floods on the Verde River, Arizona, effectively verifying the three-dimensional variation of stage to give unique discharge of nearly 3200 cubic meters per second.  This discharge was verified by flow through a dam immediately downstream.
  • Constructed a dambreak model for the Pakistan Army to mitigate the Haittian landslide dam that had just buried 2 entire villages. Modeling determined how much to downcut the landslide to preserve infrastructure downstream. The cut was made and the resulting flow matched the prediction of my model. For this work Dan O'Connell and I received recognition from the Pakistan Army.
  • Constructed a shallow flow model for debris flows and avalanches to model USGS flume data.
  • Co-construction of Ash3d, an ash transport program, along with Hans Schwaiger (USGS) and Larry Mastin (USGS). Used Bayesian methods to refine forecasts of ash clouds.
  • Used gravity and seismic data to quantify gravitational component, verify existing volcano-tectonic features, and illustrate the deep structure cradling magma and mush in the volcano.

Past Appointments

  • NRC postdoctoral Fellow 1979
  • Submersible work with US Navy, 1986-1989
  • Geophysicist, adjunct, Oceanography Dept, University of Washington, 1986-1999
  • Visiting Scientist, Meteorological Office, Exeter, England, 2016

*Disclaimer: Listing outside positions with professional scientific organizations on this Staff Profile are for informational purposes only and do not constitute an endorsement of those professional scientific organizations or their activities by the USGS, Department of the Interior, or U.S. Government