Physics
Scientific paper
May 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979pepi...19...52g&link_type=abstract
Physics of the Earth and Planetary Interiors, vol. 19, May 1979, p. 52-58. Research supported by the Natural Environment Resear
Physics
6
Actuators, Lunar Tides, Moonquakes, Selenology, Apollo Flights, Love Waves, Lunar Seismographs, S Waves, Shear Stress, Stress Distribution, Stress Tensors, Tidal Waves, Velocity Distribution, Alsep, Apollo 12, Apollo 14, Apollo 15, Apollo 16, Moon, Moonquakes, Origin, Tides, Earth, Tidal Stresses, Seismicity, Seismic Waves, S-Waves, P-Waves, Models, Faults, Seismic Velocities
Scientific paper
Deep moonquakes have been detected at depths between 700 and 1100 km and these moonquakes clearly display tidal periodicities in their histories of origin times and signal amplitudes, and are presumably triggered by the solid-body tide in the moon, raised primarily by the earth. The A1 hypocenter has been the most active and has also produced seismograms with signals of reversed polarity. In an attempt to deduce focal mechanisms for these events, various tidal stress functions at the A1 hypocenter were calculated, using a homogeneous moon model, and correlated with the origin times of the events. No good correlation was found however, and various possible explanations are given. Also discussed are failure criteria, moon models, and focal mechanisms and signal amplitudes. It is concluded that while a tidal triggering rather than a changing tidal stress field inducing of moonquakes is more plausible, the problem appears intractable in the present state of knowledge.
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