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Accelerated plate tectonics.

D L Anderson

    Science (New York, N.Y.)
    |March 21, 1975
    PubMed
    Summary
    This summary is machine-generated.

    Great earthquakes at convergent plate boundaries are analyzed using a stressed elastic lithospheric plate model. This model explains earthquake recurrence, separation, and migration, revealing accelerated plate motion after major events.

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    Area of Science:

    • Geophysics
    • Tectonophysics
    • Seismology

    Background:

    • The behavior of the lithosphere and asthenosphere influences seismic activity.
    • Understanding earthquake cycles is crucial for hazard assessment.

    Purpose of the Study:

    • To model the recurrence interval of great earthquakes at convergent plate boundaries.
    • To differentiate between decoupling and lithospheric earthquakes.
    • To analyze the migration patterns of large earthquakes along an arc.

    Main Methods:

    • Utilizing a conceptual model of a stressed elastic lithospheric plate.
    • Simulating the plate's interaction with a viscous asthenosphere.
    • Calculating earthquake recurrence intervals and migration patterns.

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    Main Results:

    • The model successfully calculates earthquake recurrence intervals and migration patterns.
    • A distinction is made between decoupling and lithospheric earthquakes.
    • Plate motion is shown to accelerate following great decoupling earthquakes.

    Conclusions:

    • Plate motion is characterized by periods of rapid movement interspersed with quiescence.
    • Great decoupling earthquakes significantly impact subsequent plate motion dynamics.
    • The elastic-viscous plate model provides a framework for understanding earthquake cycles and plate tectonics.