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Moonquakes.

G Latham, M Ewing, J Dorman

    Science (New York, N.Y.)
    |November 12, 1971
    PubMed
    Summary
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    Moonquakes, seismic events on the Moon, occur monthly and are triggered by tidal stresses. Most seismic energy originates from a single deep focal zone, indicating internal lunar strain release.

    Area of Science:

    • Seismology
    • Lunar Science
    • Geophysics

    Background:

    • The Moon experiences seismic activity, termed moonquakes, though at a lower rate than Earth.
    • Over 100 moonquakes were recorded by Apollo 12 and 14 seismic stations.

    Purpose of the Study:

    • To analyze the patterns and characteristics of recorded moonquakes.
    • To investigate the correlation between moonquakes and lunar gravitational variations.
    • To identify the locations and nature of moonquake focal zones.

    Main Methods:

    • Analysis of seismic data from Apollo lunar surface stations.
    • Correlation of moonquake occurrences with lunar orbital positions (perigee, apogee).
    • Examination of lunar gravity variations over a 7-month period.

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    Main Results:

    • Moonquakes exhibit monthly periodicity, coinciding with perigee and apogee.
    • A strong correlation exists between moonquakes and long-term lunar gravity variations.
    • 80% of detected seismic energy originates from a single focal zone, located deep within the Moon.
    • Focal zones are small (<10 km) and fixed, suggesting cumulative strain release.

    Conclusions:

    • Moonquakes are likely caused by the release of internal lunar strain.
    • Tidal stresses appear to be the primary trigger for moonquake events.
    • The findings suggest ongoing geological processes within the Moon.