INTERNAL FRICTION IN LUNAR ROCKS AND TERRESTRIAL ROCKS.

B. R. Tittmann

doi:10.1109/ultsym.1974.196389

INTERNAL FRICTION IN LUNAR ROCKS AND TERRESTRIAL ROCKS.

B. R. Tittmann

Engineering Science and Mechanics

Research output: Contribution to conference › Paper › peer-review

3 Scopus citations

Abstract

Recent work has shown that the removal of small traces of absorbed volatiles remaining in nominally dry terrestrial analogs of lunar basalt drastically increase the internal friction quality factor Q. Now room temperature Q values above 2000 have been obtained by removal of these volatiles in high vacuum at elevated tempertures. Removal of trace volatiles increases Q in a qualitatively similar way at 15 kHz and 75 kHz but the maximum Q values were obtained at the lower frequency. Studies using a porous glass showed that strong outgassing also produces a substantial increase in Q in a material differing drastically in matrix composition and pore size and shape. Frequency dependence data strongly suggest that the effect of trace volatiles will be important at seismic frequencies. The authors results are used in conjunction with Q values deduced from lunar seismic data to infer that no more than the order of 10 cm equivalent of water can be trapped in the upper 25 km of the moon.

Original language	English (US)
Pages	509-513
Number of pages	5
DOIs	https://doi.org/10.1109/ultsym.1974.196389
State	Published - Jan 1 1974
Event	Ultrason Symp, Proc - Milwaukee, WI, USA Duration: Nov 11 1974 → Nov 14 1974

Other

Other	Ultrason Symp, Proc
City	Milwaukee, WI, USA
Period	11/11/74 → 11/14/74

All Science Journal Classification (ASJC) codes

General Engineering

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10.1109/ultsym.1974.196389

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title = "INTERNAL FRICTION IN LUNAR ROCKS AND TERRESTRIAL ROCKS.",

abstract = "Recent work has shown that the removal of small traces of absorbed volatiles remaining in nominally dry terrestrial analogs of lunar basalt drastically increase the internal friction quality factor Q. Now room temperature Q values above 2000 have been obtained by removal of these volatiles in high vacuum at elevated tempertures. Removal of trace volatiles increases Q in a qualitatively similar way at 15 kHz and 75 kHz but the maximum Q values were obtained at the lower frequency. Studies using a porous glass showed that strong outgassing also produces a substantial increase in Q in a material differing drastically in matrix composition and pore size and shape. Frequency dependence data strongly suggest that the effect of trace volatiles will be important at seismic frequencies. The authors results are used in conjunction with Q values deduced from lunar seismic data to infer that no more than the order of 10 cm equivalent of water can be trapped in the upper 25 km of the moon.",

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AU - Tittmann, B. R.

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N2 - Recent work has shown that the removal of small traces of absorbed volatiles remaining in nominally dry terrestrial analogs of lunar basalt drastically increase the internal friction quality factor Q. Now room temperature Q values above 2000 have been obtained by removal of these volatiles in high vacuum at elevated tempertures. Removal of trace volatiles increases Q in a qualitatively similar way at 15 kHz and 75 kHz but the maximum Q values were obtained at the lower frequency. Studies using a porous glass showed that strong outgassing also produces a substantial increase in Q in a material differing drastically in matrix composition and pore size and shape. Frequency dependence data strongly suggest that the effect of trace volatiles will be important at seismic frequencies. The authors results are used in conjunction with Q values deduced from lunar seismic data to infer that no more than the order of 10 cm equivalent of water can be trapped in the upper 25 km of the moon.

AB - Recent work has shown that the removal of small traces of absorbed volatiles remaining in nominally dry terrestrial analogs of lunar basalt drastically increase the internal friction quality factor Q. Now room temperature Q values above 2000 have been obtained by removal of these volatiles in high vacuum at elevated tempertures. Removal of trace volatiles increases Q in a qualitatively similar way at 15 kHz and 75 kHz but the maximum Q values were obtained at the lower frequency. Studies using a porous glass showed that strong outgassing also produces a substantial increase in Q in a material differing drastically in matrix composition and pore size and shape. Frequency dependence data strongly suggest that the effect of trace volatiles will be important at seismic frequencies. The authors results are used in conjunction with Q values deduced from lunar seismic data to infer that no more than the order of 10 cm equivalent of water can be trapped in the upper 25 km of the moon.

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ER -

INTERNAL FRICTION IN LUNAR ROCKS AND TERRESTRIAL ROCKS.

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