Hi everyone,

Please join us for the Geodynamics Seminar in the Seismology Seminar Room (seismology 2nd floor) this coming Monday, October 14th at 2 pm. Johan Gilchrist from the University of Oregon will be presenting on large explosive eruption columns. If you would like to meet with the speaker on October 14th, please email Einat Lev ([email protected]) to set up a time.

All the best,

Conor Bacon, Josh Murray, Collin Brandl, and Terry Plank

Title: The collapse dynamics of the largest explosive eruption columns on Earth

Abstract: The type and intensity of large explosive eruption hazards depends on the gravitational stability of the column of volcanic gases, ash, and rocks formed above the volcanic vent. During my PhD at the University of British Columbia, I conducted analog experiments on sand-water jets and discovered a new “sedimentation wave” model that can predict the timing and intensity of eruption column collapse feeding deadly pyroclastic density currents. The sedimentation wave model predicts the construction of striking submarine terraced deposits surrounding calderas in the ocean and suggests that large-caldera forming eruptions typically occur in gravitationally unstable column regimes.

Bio: Johan Gilchrist was born near LDEO in Montclair, NJ and took his street smarts to the mountains of British Columbia where he completed his PhD thesis at the University of British Columbia with Professor Mark Jellinek. Since then he has worked as a Glaciologist for the Brucejack Mine in Northwest BC and is currently a NSF postdoctoral fellow working on the next generation of analog eruption modelling methods with Professor Josef Dufek at the University of Oregon.

Zoom link:

https://columbiauniversity.zoom.us/j/92780275650?pwd=BgfOzfYBkYE2iTUEKMkE2wJLoDI7Ul.1

Meeting ID: 927 8027 5650

Passcode: 582874

For a complete view of the planned seminars this semester, please visit the calendar on the Geodynamics Seminar webpage.