Use of High Performance Computing to Generate and Utilize 3D Tomographic Velocity Models
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Conley, Andrea C.↗
Engineering topics
Ballard, Sanford
Publications and source records attributed to Ballard, Sanford.
Updated SALSA3D Tomographic Velocity Model for Improved Travel-Time Prediction and Uncertainty
This poster will be shown at the 2023 Seismological Society of America conference in San Juan, Puerto Rico. The audience will consist of international members of academia and U.S. lab and government members. Due to time limits, full review is being undertaken in parallel with HQ review. The full review will not be accepted until HQ approval comes through.
Conley, Andrea C↗
SALSA3D: Updated Tomographic Velocity Models for Improved Travel-Time Prediction and Uncertainty .
Abstract not provided.
Conley, Andrea↗
Developing a Consistent Travel-Time Framework for Comparing Three-Dimensional Velocity Models for Seismic Location Accuracy
Abstract Location algorithms have historically relied on simple, one-dimensional (1D) velocity models for fast seismic event locations. 1D models are generally used as travel-time lookup tables, one for each seismic phase, with travel-times pre-calculated for event distance and depth. These travel-time lookup tables are extremely fast to use and this fast computational speed makes them the preferred type of velocity model for operational needs. Higher-dimensional (i.e., three-dimensional—3D) seismic velocity models are becoming readily available and provide more accurate event locations over 1D models. The computational requirements of these 3D models tend to make their operational use prohibitive. Additionally, comparing location accuracy for 3D seismic velocity models tends to be problematic, as each model is determined using different ray-tracing algorithms. Attempting to use a different algorithm than the one used to develop a model usually results in poor travel-time prediction. We demonstrate and test a framework to create first-P and first-S 3D travel-time correction surfaces using an open-source framework ( PCalc + GeoTess , https://www.sandia.gov/salsa3d/software/geotess ) that easily stores 3D travel-time and uncertainty data. This framework produces fast travel-time and uncertainty predictions and overcomes the ray-tracing algorithm hurdle because the lookup tables can be generated using the exact ray-tracing algorithm that is preferred for a model.
3D velocity models↗