Mantle Dynamics beneath Mount St. Helens from Shear Wave Splitting

Caroline M Eakin, Australian National University, Research School of Earth Sciences, Canberra, ACT, Australia, Erin Wirth, USGS, Seattle, WA, United States, Abraham Wallace, University of Oklahoma Norman Campus, Norman, United States, Carl W Ulberg, University of Washington, Seattle, WA, United States, Kenneth C Creager, Univ Washington, Seattle, WA, United States and Geoffrey A Abers, Lamont -Doherty Earth Observatory, Palisades, NY, United States