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Characterizing The 410 Km Discontinuity Low-Velocity Layer Beneath The La Ristra Array In The North American Southwest, J. J. Jasbinsek, Ken Dueker, S. M. Hansen
Characterizing The 410 Km Discontinuity Low-Velocity Layer Beneath The La Ristra Array In The North American Southwest, J. J. Jasbinsek, Ken Dueker, S. M. Hansen
Ken Dueker
Receiver functions recorded by the 54-station 920 km long Program for Array Seismic Studies of the Continental Lithosphere-Incorporated Research Institutions for Seismology Colorado Plateau/Rio Grande Rift Seismic Transect Experiment (LA RISTRA) line array display a pervasive negative polarity P to S conversion (Pds) arrival preceding the positive polarity 410 km discontinuity arrival. These arrivals are modeled as a low-velocity layer atop the 410 km discontinuity (410-LVL) and are inverted for a velocity profile via a grid search using a five-parameter linear gradient velocity model. Model parameter likelihood and correlations are assessed via calculation of one-and two-dimensional marginal posterior probability distributions. …