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GSA Special Papers
Large Meteorite Impacts III
Author(s)
Geological Society of America

Volume
384
Copyright:
Geological Society of America
Geological Society of America
ISBN print:
9780813723846
Publication date:
January 01, 2005
Book Chapter
Giant impact-induced blow-off of primordial atmosphere
Author(s)
Sidao Ni
;
Sidao Ni
1
Seismological Laboratory 252-21, California Institute of Technology, Pasadena, California 91125, USA
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Thomas J. Ahrens
Thomas J. Ahrens
1
Seismological Laboratory 252-21, California Institute of Technology, Pasadena, California 91125, USA
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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...
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