ArticlesOther Physical Properties

Elastic Wave Velocities of Lunar Samples at High Pressures and Their Geophysical Implications

Science  30 Jan 1970:
Vol. 167, Issue 3918, pp. 726-728
DOI: 10.1126/science.167.3918.726

Abstract

Ultrasonic measurement of P and S velocities of Apollo 11 lunar samples 10020, 10057, and 10065 to 5 kilobars pressure at room temperature shows a pronounced increase of velocity (as much as twofold) for the first 2 kilobars. The travel times predicted from the velocity-depth curve of sample 10057 are consistent with the results of the Apollo 12 seismic experiments. At pressures below 200 bars, the samples are highly attenuating; for both P and S waves, the value of Q is about 10.

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