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Remote triggering of fault-strength changes on the San Andreas fault at Parkfield

Author

Listed:
  • Taka’aki Taira

    (Carnegie Institution of Washington, District of Columbia 20015, USA)

  • Paul G. Silver

    (Carnegie Institution of Washington, District of Columbia 20015, USA)

  • Fenglin Niu

    (Rice University, Houston, Texas 77005, USA)

  • Robert M. Nadeau

    (Berkeley Seismological Laboratory, University of California, Berkeley, California 94720, USA)

Abstract

Earthquakes find fault A 20-year seismological record of from the Parkfield area of the San Andreas fault has been used to identify two occasions when long-term changes in fault strength seem to have been induced remotely by large seismic events — the 2004 Sumatra–Andaman and the 1992 Landers earthquakes. In both cases, two changes occurred that are consistent with variations in fault strength: variation in the properties of seismic scatterers with time (reflecting stress-induced migration of fluids) and systematic variation in the characteristics of repeating-earthquake sequences. These findings suggest that the largest earthquakes have a global influence on the strength of the Earth's fault systems. In support of that hypothesis, an unusually large number of M ≥ 8 earthquakes occurred in the three years following the 2004 Sumatra–Andaman earthquake.

Suggested Citation

  • Taka’aki Taira & Paul G. Silver & Fenglin Niu & Robert M. Nadeau, 2009. "Remote triggering of fault-strength changes on the San Andreas fault at Parkfield," Nature, Nature, vol. 461(7264), pages 636-639, October.
    • Handle: RePEc:nat:nature:v:461:y:2009:i:7264:d:10.1038_nature08395
    DOI: 10.1038/nature08395
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