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Striations, duration, migration and tidal response in deep tremor

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  • Satoshi Ide

    (University of Tokyo, Hongo 7-3-1, Bunkyo, Tokyo 113-0033, Japan)

Abstract

Deep tremor at subduction zones Deep seismic tremor provides valuable information on deep plate motion and shallow stress accumulation on the fault plane of megathrust earthquakes. It has been suggested that in subduction zones, deep seismic tremor repeats at regular intervals, is migrated at various velocities and is modulated by tidal stress. Satoshi Ide now presents evidence that a time-invariant interface property seems to control tremor behaviour in the Nankai subduction zone of Japan. In areas where tremor duration is short, tremor is more strongly affected by tidal stress and migration is inhibited; where tremor lasts longer, diffusive migration occurs with a constant diffusivity. He also finds that the spatial variation of the controlling property is characterized by striations in tremor source distribution, which follow either the present or previous plate subduction directions. Such interface properties might therefore be controlled by the subduction of inhomogeneous structures, such as seamounts.

Suggested Citation

  • Satoshi Ide, 2010. "Striations, duration, migration and tidal response in deep tremor," Nature, Nature, vol. 466(7304), pages 356-359, July.
    • Handle: RePEc:nat:nature:v:466:y:2010:i:7304:d:10.1038_nature09251
    DOI: 10.1038/nature09251
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