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The velocity structure of the lunar crust.Seismic refraction data, obtained at the Apollo 14 and 16 sites, when combined with other lunar seismic data, allow a compressional wave velocity profile of the lunar near-surface and crust to be derived. The regolith, although variable in thickness over the lunar surface, possesses surprisingly similar seismic properties. Underlying the regolith at both the Apollo 14 Fra Mauro site and the Apollo 16 Descartes site is low-velocity brecciated material or impact derived debris. Key features of the lunar seismic velocity profile are: (1) velocity increases from 100 to 300 m/sec in the upper 100 m to about 4 km/sec at 5 km depth, (2) a more gradual increase from about 4 km/sec to about 6 km/sec at 25 km depth,(3) a discontinuity at a depth of 25 km, and (4) a constant value of about 7 km/sec at depths from 25 km to about 60 km.
Document ID
19730042684
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Kovach, R. L.
(Stanford University Stanford, Calif., United States)
Watkins, J. S.
(North Carolina, University Chapel Hill, N.C., United States)
Date Acquired
August 7, 2013
Publication Date
April 1, 1973
Publication Information
Publication: The Moon
Volume: 7
Subject Category
Space Sciences
Accession Number
73A27486
Funding Number(s)
CONTRACT_GRANT: NGL-05-020-232
CONTRACT_GRANT: NAS9-5632
Distribution Limits
Public
Copyright
Other

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