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Passive seismic experiment - A summary of current statusThe data set obtained from the four-station Apollo seismic network including signals from approximately 11,800 events, is surveyed. Some refinement of the lunar model will result, but its gross features remain the same. Attention is given to the question of a small, molten lunar core, the answer to which remains dependent on analysis of signals from a far side impact. Seventy three sources of repeating, deep moonquakes have been identified, thirty nine of which have been accurately located. Concentrated at depths from 800 to 1000 km, the periodicities of these events have led to the hypothesis that they are generated by tidal stresses. Lunar seismic data has also indicated that the meteoroid population is ten times lower than originally determined from earth based observations. Lunar seismic activity is much lower and mountainous masses show no sign of sinking, in contrast to earth, as a result of the lunar crust being four times thicker. While much work remains to be done, significant correlation between terrestrial and lunar observations can be seen.
Document ID
19790055288
Document Type
Conference Proceedings
Authors
Latham, G. V. (Marine Science Inst. Galveston, TX, United States)
Dorman, H. J. (Marine Science Inst. Galveston, TX, United States)
Horvath, P. (Marine Science Inst. Galveston, TX, United States)
Ibrahim, A. K. (Marine Science Inst. Galveston, TX, United States)
Koyama, J. (Marine Science Inst. Galveston, TX, United States)
Nakamura, Y. (Texas, University Marine Science Institute, Galveston, Tex., United States)
Date Acquired
August 9, 2013
Publication Date
January 1, 1978
Subject Category
LUNAR AND PLANETARY EXPLORATION
Meeting Information
Lunar and Planetary Science Conference(Houston, TX)
Funding Number(s)
CONTRACT_GRANT: NAS9-14580
CONTRACT_GRANT: NSG-7418
Distribution Limits
Public
Copyright
Other