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SEISMIC REFRACTION TRAVELTIME TOMOGRAPHY PROCESSING OF APOLLO 14 AND 16 ACTIVE SEISMIC EXPERIMENT DATA
Abstract
The American NASA Apollo missions to the lunar surface, between 1969 and 1972 greatly increased the knowledge of the Moon as well as that of our own Earth's age and origins. Part of the scientific research used geophysical techniques to help define the structure of the Moon, both deep and also regarding the near surface. One such experimentation that was carried out, on both Apollo 14 and Apollo 16, as part of the Apollo Lunar Seismic Experiment Package (ALSEP), was the Active Seismic Experiment (ASE). The ASE comprised of three geophones, planted at approximately 45m apart along a longitudinal line, that recorded signals from small explosive charges deployed at specific distances in between the geophones, The analysis resulted in a set of traveltimes, from source to receiver, that were later interpreted using the intercept time method. Since then the data set results were accepted. The development of traveltime tomographic techniques in the early 1990's allows for models to have a more realistic appearance with both lateral variations of seismic velocity as well as increasing velocities with a certain gradient in depth. This is opposed to the sharp sudden increases of compressional wave velocity typical of the intercept time method's assumption. Herein we will present a discussion as well as the results of the reinterpretation of the Apollo 14 and 16 ASE refraction traveltimes using traveltime tomography techniques.
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References14
Fowler, C.M.R. 1990. The Solid Earth - An Introduction to Global Geophysics. Cambridge University Press. 472 pp.
Günther, T., Rücker, C., A new joint inversion approach applied to the combined Tomography of dc resistivity and seismic refraction data. Leibniz Institute for Applied Geosciences, Hannover, Germany. 2009, DOI: 10.4133/1.2923578
Kovach, R., Watkins J., and Lander, T., Active Seismic Experiment, Apollo 14 Preliminary Science Report, NASA SP-272 (1971), p. 162-174
Kovach, R., Watkins, J., and Talwani, P., Active Seismic Experiment; in Apollo 16 Preliminary Science Report NASA SP-315 (1972), p.10-1 – 10-14
Kovach, R., Active Seismic Experiment (NASA Experiment S-033) In Apollo Scientific Experiments Data Handbook, NASA TM X-58131 JSC-09166 (1974) p.5-1 – 5-25
Lankston, R. (1997) High-resolution refraction seismic data acquisition and interpretation. In Geotechnical and Environmental Geophysics by S. H. Ward, (Ed.), Vol. I-Review and Tutorial: 45-74
Mcallister, B., Kerr, J., Zimmer, J., Kovach, R., and Watkins, J., A Seismic Refraction System for Lunar Use, IEEE Trans. Geosci. Electron., Vol. GE-7, No. 3, July 1969, pp. 164-171
Moura R. M., e Ribeiro H., "Relationship of shallow seismic refraction results versus lithology in a railway project plan (Northwest Portugal", SGEM2009 Conference Proceedings/ ISBN 10: 954-91818-1-2, June 14-19, 2009, Vol. 1, 693- 700 pp
Pullammanappallil, S., Louie, J., 1994, A generalized simulated-annealing optimization forinversion of first Arrival times: Bulletin of the Seismological Society of America, 84, 5, 1397-1409
Watkins, J., Whitcomb, J., Weeks, E., Graves, T., Kovach, R., Godson, R., A Lunar Engineering Seismic System, Bulletin of the Association of Engineering Geologists, Fall 1969, Volume VI, Number 2, pp. 119-129
Wilhelms, D., Geologic History of the Moon. US Geological Survey Professional Paper 1348, 1987
Zhang, J. and Toksoz, M. N., 1998, Nonlinear refraction traveltime tomography: Geophysics, 63, 05, 1726-1737.
ALSEP, Apollo Lunar Surface Experiments Package, Bendix Aerospace Systems Division, 1969
ZONDST2D User Manual, Program of two-dimensional seismic data processing and interpretation (surface, borehole and marine variations), Zond geophysical software, Saint-Petersburg 2001-2016
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