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Waveform Modeling of Acoustic-seismic Interactions Using a Hybrid Wavenumber Integration Method

Description: 

High Mach number atmospheric projectiles such as incoming bolides or spacecraft create elongate conical shock wavefronts that decay into propagating acoustic waves that may be recorded by atmospheric and ground level infrasonic instruments as well as near-surface seismic instruments. The resulting seismic wavefield is interesting from at least two points of view. The conversion from atmospheric acoustic waves to seismic waves in the solid earth creates seismic data that can be used to understand the size and intensity of the acoustic source where local infrasound data are not available and, codependently, the response of the earth to the acoustic source is a function of earth structure which opens up this dataset for probing physical characteristics of the near-surface. A hybrid wavenumber integration method is developed for an acoustic line source, as an approximation to highly elongate Mach cone wavefronts, in a smooth, vertically continuous atmosphere over a layered elastic halfspace. Atmospheric wave propagation is treated using the WKBJ approximation with a Thompson-Haskell propagator matrix formulation for the layered halfspace. Regional waveform data from Space Shuttle return missions in 2007 and 2010 for the Central United States show a variety of responses that include the interaction of the ballistic acoustic wave with near-station structure at high phase velocity for Oxford, Mississippi, and creation of long duration surface waves at other stations with the Mississippi embayment at larger distance from the vehicle trajectory.

Session: Data-driven and Computational Characterization of Non-earthquake Seismoacoustic Sources [Poster]

Type: Poster

Date: 4/16/2025

Presentation Time: 08:00 AM (local time)

Presenting Author: Charles

Student Presenter: No

Invited Presentation: 

Poster Number: 78

Authors