Moonquakes and Low Frequencies of Earthquakes

Computer Science – Sound

Scientific paper

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5120 Plasticity, Diffusion, And Creep, 6250 Moon (1221), 7209 Earthquake Dynamics And Mechanics, 7255 Surface Waves And Free Oscillations

Scientific paper

Some new results concerning moonquakes are included in this study. According to F. Duennebier and G. H. Sutton, 'Thermal moonquakes', J. of Geophysical Res., 79, 4351-4363, 1974, the moonquakes occur primarily during the early hours of the moon day. The frequency of these acoustic emissions is about 5 Hz and their duration is more than 60 s. There are interruptions in the emissions about every 10 cycles, similar to those seen in the acoustic emissions from granular media when they are forced to flow between the walls of the plunger and the container. The latter can be seen in a paper by H. Takahara, 'Sounding mechanism of singing sand', J. Acoustical Soc. Am., 53, 634-639, 1973. In a recent paper by A. J. Patitsas, 'Booming and singing acoustic emissions', J. of Fluids and Structures, 17, 287-315, 2003, the origin of the moonquakes is sought in the granular flow in the crevices of the craters during the early hours of the moon day when the rock masses tend to expand due to the relatively steep rise in the temperature on the surface of the moon. In order to render credibility to such a scenario, several simple experiments were done involving the squeezing and shearing of granular media between stone plates. The results of these experiments and the mechanism responsible for the low frequencies of the moonquakes and also for the very low frequencies associated with earthquakes will be discussed.

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