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Small earthquakes, tectonic forces.

T C Hanks

    Science (New York, N.Y.)
    |June 5, 1992
    PubMed
    Summary
    This summary is machine-generated.

    Small earthquakes are as crucial as large ones for force redistribution across all active faults, including plate boundaries. This finding impacts earthquake scaling and frequency-of-occurrence models.

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    Area of Science:

    • Seismology
    • Earthquake Science
    • Tectonophysics

    Background:

    • Understanding earthquake scaling laws is fundamental to seismology.
    • Faults of all sizes, including major plate boundaries, are key geological features.
    • The role of small earthquakes in stress redistribution has been debated.

    Purpose of the Study:

    • To investigate the significance of small earthquakes in fault mechanics.
    • To re-evaluate earthquake scaling and frequency-of-occurrence relationships.
    • To determine if small earthquakes contribute equally to force redistribution as larger events.

    Main Methods:

    • Analysis of earthquake scaling principles.
    • Review of frequency-of-occurrence data.
    • Theoretical modeling of force redistribution across active faults.

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    Main Results:

    • Small earthquakes play an equally important role as large earthquakes in force redistribution.
    • This finding is consistent across active faults of all dimensions.
    • Implications for understanding seismic hazard and fault behavior.

    Conclusions:

    • Earthquake scaling and frequency relations must account for the significant contribution of small earthquakes.
    • The findings necessitate a revision of models that underestimate the impact of minor seismic events.
    • Active faults, regardless of scale, are influenced by both small and large earthquakes in force redistribution.