Wednesday, May 23rd, 2018

Wednesday Seminar

4:10 PM, 55 Roessler
Tea and cookies at 3:45 in the aviary - (2110 EPS)

“Imaging Tectonic Plates with Surface and Converted Waves”

      – by Dr. Ved Lekic, University of Maryland

Constraining the structure of the continental lithosphere is crucial for understanding its formation, evolution, and preservation. Ambient noise techniques have enabled the measurement of surface wave dispersion -- sensitive to lithospheric structure -- to higher frequencies and with much better coverage than previously possible. Additionally, conversions of teleseismic waves detected across the EarthScope Transportable array can be analyzed by the receiver function method to infer the depth of structural interfaces in the crust and mantle. However, over much of the continental United States, these inferences are made difficult by contamination from reverberations in sedimentary layers. In this talk, I will present results of inversions of new surface wave dispersion maps constructed with a probabilistic, Bayesian approach, highlighting the significance of uncertainty quantification and inversion choices. Additionally, I will present promising new techniques for suppressing contamination due to sediment reverberations and present images of lithospheric structure based on sediment-corrected receiver functions.

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