Hybrid Propulsion Vehicle Power Conditioning Packaging

Not Available The purpose of this research is to develop improved methods for regional and local seismic event locations from 3-D velocity models. Improved hypocenter estimates and high-resolution velocity models are critical to the successful seismic monitoring of the Comprehensive Test Ban Treaty. During Phase I of the study we will demonstrate a nonlinear, multiple event location technique which uses both P and S arrival times and a pre-determined or hypothetical 3-D velocity model to estimate the hypocenters. Travel times for the regional phases are calculated using a sophisticated eikonal finite-difference scheme, and the locations are determined using an efficient grid-search algorithm for 3-D media. We propose to demonstrate its capabilities using synthetic data and a 3-D velocity model from a region of US monitoring concern. We will also begin to develop the capacity to incorporate secondary phase arrival information as part of the location estimation procedure. The methods proposed in this study can have immediate dual use application in both seismic monitoring and underground facility characterization. The overall goal of the research is to develop a sophisticated set of commercial tools for improving hypocenter estimation using 3-D velocity models which could be used in multiple seismic applications.