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Silent fault slip following an interplate thrust earthquake at the Japan Trench

Author

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  • Kosuke Heki

    (National Astronomical Observatory)

  • Shin'ichi Miyazaki

    (Geographical Survey Institute)

  • Hiromichi Tsuji

    (Ministry of Construction)

Abstract

Recent global space geodetic measurements have revealed that the velocities of tectonic plates over timescales as short as a decade1 are consistent with models of velocities averaged over the past few million years. The slip inferred from interplate thrust earthquakes at deep sea trenches and and number of earthquakes, however, often falls short of that predicted from these observed plate convergence rates2,3. Here we report transient crustal movements recorded by a permanent Global Positioning System (GPS) network in northeastern Japan following a typical interplate earthquake that occurred in December 1994 at the Japan Trench. Cumulative fault slip was estimated from the postseismic displacements at the GPS points over the first year after the event, and the inferred amount of seismic moment released by the afterslip was comparable to that released in the high-speed rupture. Such seismically 'invisible' slip may therefore account for the shortage of seismic slip relative to that required by time-averaged plate velocities.

Suggested Citation

  • Kosuke Heki & Shin'ichi Miyazaki & Hiromichi Tsuji, 1997. "Silent fault slip following an interplate thrust earthquake at the Japan Trench," Nature, Nature, vol. 386(6625), pages 595-598, April.
    • Handle: RePEc:nat:nature:v:386:y:1997:i:6625:d:10.1038_386595a0
    DOI: 10.1038/386595a0
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    Cited by:

    1. Jyh-Woei Lin, 2013. "An empirical correlation between the occurrence of earthquakes and typhoons in Taiwan: a statistical multivariate approach," Natural Hazards: Journal of the International Society for the Prevention and Mitigation of Natural Hazards, Springer;International Society for the Prevention and Mitigation of Natural Hazards, vol. 65(1), pages 605-634, January.

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