Bulletin of the American Physical Society
Four Corners Section 2022 Meeting
Volume 67, Number 14
Friday–Saturday, October 14–15, 2022; Albuquerque, New Mexico
Session M04: Atmospheric Physics/Geophysics
1:00 PM–2:36 PM,
Saturday, October 15, 2022
UNM
Room: PAIS 2540
Chair: Richard Sonnenfeld, New Mexico Tech and Langmuir Lab
Abstract: M04.00003 : Numerical Modelling of a Meteorite Impact Seismic Source Using the Stress Glut Theory*
1:36 PM–1:48 PM
Presenter:
Marouchka Froment
(Los Alamos National Laboratory)
Authors:
Marouchka Froment
(Los Alamos National Laboratory)
Philippe Lognonné
(Université Paris Cité, Institut de Physique du Globe de Paris, CNRS)
Carene Larmat
(Los Alamos National Laboratory, Earth and Environmental Sciences Division)
Zhou Lei
(Los Alamos National Laboratory, Earth and Environmental Sciences Division)
Esteban Rougier
(Los Alamos National Laboratory, Earth and Environmental Sciences Division)
Taichi Kawamura
(Université Paris Cité, Institut de Physique du Globe de Paris, CNRS)
Here, we use the seismic representation theorem, and particularly the stress glut theory, to model the seismic motion resulting from impact cratering. The source is described by equivalent forces exerted on an initially undeformed medium, which result from the impactor momentum transfer, and from inelastic, non-linear processes occurring in the impacted region. We condense them into a point source with a time-varying single force and moment tensor. This analytical representation bridges the gap between the complex dynamics of crater formation, and the linear point-source representation classically used by seismologists.
Using the modelling software HOSS (Hybrid Optimization Software Suite), we develop a method to compute the equivalent forces of an impact, and its point source. We verify this model by comparing two signals: (1) HOSS is coupled to SPECFEM3D to propagate the near-source signal to remote seismic stations; (2) The point-source model derived from the stress-glut theory is used to generate displacements at the same distance. The comparison shows that the point-source model is accurately simulating the low-frequency impact seismic waveform. High-frequencies discrepancies exist. We are testing if they are related to finite-source effects.
*The French authors acknowledge the French Space Agency CNES and ANR (ANR-14-CE36-0012-02, IdEx Université de Paris ANR-18-IDEX-0001, and ANR-19-CE31-0008-08) for funding InSight Science analysis. M.F. is funded by the Center for Space and Earth Science of Los Alamos National Laboratory.
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