Crustal Structure in West Antarctica from Regional Waveform Modeling

Monday, 15 December 2014
Andriamiranto Raveloson1, Andrew Nyblade2, John Paul O'Donnell3, Sridhar Anandakrishnan3, Doulgas A Wiens4, Richard C Aster5, Audrey D Huerta6 and Terry J Wilson7, (1)Penn State, State College, PA, United States, (2)Penn St Univ, University Park, PA, United States, (3)Pennsylvania State University Main Campus, University Park, PA, United States, (4)Washington University in St Louis, St. Louis, MO, United States, (5)Colorado State University, Geosciences Department, Fort Collins, CO, United States, (6)Central Washington University, Ellensburg, WA, United States, (7)Ohio State University Main Campus, Columbus, OH, United States
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.