Crustal Structure in West Antarctica from Regional Waveform Modeling

Andriamiranto Raveloson, Penn State, State College, PA, United States, Andrew Nyblade, Pennsylvania State University, Department of Geosciences, University Park, United States, John Paul O'Donnell, Pennsylvania State University Main Campus, University Park, PA, United States, Sridhar Anandakrishnan, Pennsylvania State University, Department of Geosciences and Earth and Environmental Systems Institute, University Park, United States, Douglas Wiens, Washington University in St Louis, St. Louis, MO, United States, Richard C Aster, Colorado State University, Geosciences Department, Fort Collins, United States, Audrey D Huerta, Central Washington University, Dept. of Geological Sciences, Ellensburg, United States and Terry J Wilson, Ohio State University Main Campus, Columbus, OH, United States
Abstract:
Crust and uppermost mantle structure across West Antarctica is investigated by modeling regional seismograms recorded on POLENET stations from the June 1st, 2012 Mw 5.6 earthquake located offshore Marie Byrd Land. The seismograms are modeled using a simple grid search approach with a 3-layer crust over a mantle half-space. The ice-layer is also included with a fixed thickness. Synthetic seismograms are computed using the reflectivity method. Preliminary results indicate crustal thickness of 20 – 30 km, a sedimentary basin with low velocities, and a Pn velocity of 7.9 – 8.0 km/s.
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