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Geophysics Department Seminar - Brandon Schmandt: Investigating Mount St. Helens' Seismicity and Magma Plumbing with a Hybrid, Passive, and Active Source Array
Speaker: Dr. Brandon Schmandt, Assistant Professor, University of Mexico
In summer 2014 seismologists from several universities (U. Washington, Rice, Cornell, U. New Mexico) and the USGS teamed up to deploy multi-scale seismic arrays to detect active processes and seismically image the structure beneath Mount St. Helens. An unusual aspect of a subset of the dense array of short period seismometers is that it recorded continuously to study local earthquakes in addition to obtaining dense recordings of controlled source explosions. Emerging results from the collaborative study include high-resolution detection and location of multiple types of earthquakes, and evidence for multi-stage magma ascent starting with input of mantle melts into the lower crust offset to the east of Mount St. Helens. This research effort is supported by NSF GeoPRISMS, EarthScope, and Geophysics.