Moon body resonance
Résonance du corps lunaire
Résumé
The full range of 50 initial, Moon-orbit-forced superharmonic resonance periods is detected in the 1969-1977 time-series of all 12474 consecutive 0.02 Hz moonquakes from the Apollo Program catalog. The resonance is found forcing the strongest-energy (highest-fidelity) part of the 10 hours–100 days (27.78–0.115741 μHz) long-periodic band at 99–67% confidence as well as below. Resonance signatures of the Moon’s other four long tidal periods – synodic, anomalistic, nodical, and tropical – were also identified but not as separate drivers of body resonance. The spectra were computed using a least-squares spectral analysis method that enabled separation of the signal driver and noise signatures of all lunar tides, as well as extraction of the exact sequence of resonant subperiods affecting the solid Moon. Thus lunar seismotectonics is forced by the Moon’s orbital period as the disruptive phase that introduces nonlinearity into lunar vibration, giving rise to superharmonic resonance and probably the so-called free librations as well. The earlier computation of the Earth superharmonic resonance and this computation of the Moon superharmonic resonance constitute conclusive proof of the universality of body mechanical resonance in astronomical bodies, as well as of the driving role of geophysics as a catalyst of life.
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