Abstract
NASA’s InSight mission records several high-frequency (>0.5
Hz) dispersive seismic signals. These signals are due to the
acoustic-to-seismic coupling, where the infrasound is generated by
meteorite entry and impacts. This dispersion property is due to
infrasound propagating in a structured atmosphere, and we refer to this
infrasound as guided infrasound. We propose to model the propagation of
guided infrasound and the seismic coupling to the ground analytically;
we use a 1D layered atmosphere on a three-layer solid subsurface medium.
The synthetic ground movements fit the observed dispersive seismic
signals well. We also examine and validate the previously-published
subsurface models derived from the InSight ambient seismic vibration
data.