Adding Tsunami Observations and Modeling to the USGS Finite Fault Modeling Procedure
The U.S. Geological Survey National Earthquake Information Center (NEIC) is expanding its earthquake finite fault modeling capabilities to include tsunami modeling and the inversion of tsunami observations. In preliminary testing, we find that the quality of the earthquake source characterization is improved by consideration of offshore data from Deep ocean Assessment and Reporting of Tsunamis (DART) buoys. We demonstrate new tools within the NEIC’s finite fault modeling software (Wavelet and simulated Annealing SliP; WASP) developed to interact with the tsunami modeling software, GeoClaw. These updates support forward modeling of the expected tsunami from an offshore finite fault model, allowing early estimates of the ocean response to fault motions. However, earthquake source characterization from terrestrial observations alone is not always compatible with the resulting tsunami (e.g., 2020 M7.6 Sand Point, Alaska), which motivates operationalizing joint inversion of earthquake and tsunami observations. Tsunami amplitudes provide critical constraints on the updip extent of slip, the kinematics of rupture, and the amplitude of vertical deformation. Updates to WASP seamlessly call on GeoClaw to facilitate the calculation of tsunami Green’s functions. WASP then inverts DART observations of the tsunami alongside terrestrial seismic and geodetic observations of the causative earthquake. GeoClaw is then called once again to enable tsunami propagation modeling. In this presentation, we showcase the implementation of the updated WASP software package and share results from joint inversions of tsunamigenic earthquakes, demonstrating the gains afforded by including DART observations.
Session: Six Decades of Tsunami Science: From the Source of the 1964 Tsunami to Modern Community Preparedness [Poster Session]
Type: Poster
Room: Exhibit Hall
Date: 5/2/2024
Presentation Time: 08:00 AM (local time)
Presenting Author: Dara Goldberg
Student Presenter: No
Additional Authors
Dara Goldberg Presenting Author Corresponding Author degoldberg@usgs.gov U.S. Geological Survey |
Pablo Koch pkoch@csn.uchile.cl University of Chile |
Diego Melgar dmelgarm@uoregon.edu University of Oregon |
Heather Hunsinger hhunsinger@usgs.gov U.S. Geological Survey |
Kirstie Haynie khaynie@usgs.gov U.S. Geological Survey |
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Adding Tsunami Observations and Modeling to the USGS Finite Fault Modeling Procedure
Category
Six Decades of Tsunami Science: From the Source of the 1964 Tsunami to Modern Community Preparedness
Description