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Related Concept Videos

  • Earth Sciences
  • Geophysics
  • Geodesy
  • Deformation Cycles Of Subduction Earthquakes In A Viscoelastic Earth.
  • Earth Sciences
  • Geophysics
  • Geodesy
  • Deformation Cycles Of Subduction Earthquakes In A Viscoelastic Earth.

    • Related Experiment Videos

    Deformation cycles of subduction earthquakes in a viscoelastic Earth.

    Kelin Wang1, Yan Hu, Jiangheng He

    • 1Pacific Geoscience Centre, Natural Resources Canada, Geological Survey of Canada, Sidney, British Columbia V8L 4B2, Canada. kwang@nrcan.gc.ca

    Nature
    |April 21, 2012

    View abstract on PubMed

    Summary
    This summary is machine-generated.

    Space geodesy reveals mantle viscosity controls earthquake deformation cycles in subduction zones. Comparative studies revise traditional elastic models of crustal movement between major seismic events.

    Related Experiment Videos

    Area of Science:

    • Geophysics
    • Tectonics
    • Seismology

    Background:

    • Subduction zones generate Earth's most powerful earthquakes.
    • Space geodesy has transformed the study of crustal deformation between earthquakes over the last 20 years.
    • Modern geodetic data spans a limited time, requiring comparisons across different subduction zones.

    Purpose of the Study:

    • To integrate geodetic data from various subduction zones.
    • To understand the interplay of short-term and long-term mantle behavior in controlling deformation.
    • To challenge and revise traditional elastic models of earthquake deformation.

    Main Methods:

    • Utilizing space geodesy techniques to measure crustal deformation.
    • Conducting comparative analyses of subduction zones at different points in their seismic cycles.
    • Synthesizing geodetic 'snapshots' to build a comprehensive deformation model.

    Main Results:

    • Interseismic deformation is influenced by both short-term (years) and long-term (decades/centuries) mantle viscosity.
    • A unifying model of subduction zone deformation emerges from comparative geodetic studies.
    • Elastic models, which posit coseismic and interseismic deformation as mirror images, are being re-evaluated.

    Conclusions:

    • Mantle viscosity plays a critical role in modulating deformation cycles in subduction zones.
    • The integration of geodetic data provides a more nuanced understanding of tectonic processes.
    • Future research should continue to refine models incorporating viscoelastic mantle behavior.