Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978pazh....4..145l&link_type=abstract
(Pis'ma v Astronomicheskii Zhurnal, vol. 4, Mar. 1978, p. 145-147.) Soviet Astronomy Letters, vol. 4, Mar.-Apr. 1978, p. 77, 78.
Astronomy and Astrophysics
Astronomy
Hypervelocity Impact, Meteorite Collisions, Meteorite Craters, Phobos, Seismic Waves, Elastic Waves, Propagation Velocity, Seismic Energy, Solar System, Standing Waves
Scientific paper
This letter demonstrates that both parallel grooves and a deficiency of small craters, such as have been observed on Phobos, can develop from internal oscillations in a solid satellite that are induced by a collision with a suitable meteoroid. A limit is placed on the period of the induced vibrations, and it is shown that a system of standing waves with a period of 0.2 sec could have generated an organized system of furrows with a characteristic spacing of about 200 m on Phobos. The energy carried by these waves is estimated to have been approximately 5 x 10 to the 18th erg for a regolith density of 2 g/cu cm. It is concluded that the impact of a meteoroid generating a crater about 4 km in diameter could also simultaneously produce a regular system of grooves and denude craters of small diameter.
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