Large Meteorite Impacts III
Giant impact-induced blow-off of primordial atmosphere
Published:January 01, 2005
The surface motion from a large impact upon an attenuation-free fluid sphere was studied and numerically simulated. An analytic solution for the free-surface velocity shows that close to the source, the acoustic wave due to the free-surface interaction (a “quasi-surface wave”) is not separable from the direct wave. At >90°, the quasi-surface wave separates and has a larger amplitude than the direct body wave. Near the antipode the quasi-surface wave amplitude is much larger than the direct body wave and is comparable to the direct wave amplitude immediately near the source at 0°. The resulting solution covers both the wave...