Striations, duration, migration and tidal response in deep tremor.

Nature
Satoshi Ide

Abstract

Deep tremor in subduction zones is thought to be caused by small repeating shear slip events on the plate interface with significant slow components. It occurs at a depth of about 30 kilometres and provides valuable information on deep plate motion and shallow stress accumulation on the fault plane of megathrust earthquakes. Tremor has been suggested to repeat at a regular interval, migrate at various velocities and be modulated by tidal stress. Here I show that some time-invariant interface property controls tremor behaviour, using precise location of tremor sources with event duration in western Shikoku in the Nankai subduction zone, 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 of 10(4) m(2) s(-1). The control property may be the ratio of brittle to ductile areas, perhaps determined by the influence of mantle wedge serpentinization on the plate interface. The spatial variation of the controlling property seems to be characterized by striations in tremor source distribution, which follows either the current or previous plate subduction directions. This suggests that t...Continue Reading

References

Dec 2, 2006·Science·Yoshihiro ItoHitoshi Hirose
Mar 16, 2007·Nature·David R ShellySatoshi Ide
May 4, 2007·Nature·Satoshi IdeTakahiko Uchide
Nov 24, 2007·Science·Justin L RubinsteinAaron G Wech

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Citations

Jul 16, 2010·Nature·Naomi Lubick
Apr 5, 2016·Nature·Deepa Mele Veedu, Sylvain Barbot
Jul 20, 2016·Proceedings of the National Academy of Sciences of the United States of America·Nicholas J van der ElstPaul A Johnson
Feb 28, 2018·Scientific Reports·Masayuki KanoKazushige Obara
Aug 14, 2020·Proceedings of the Japan Academy. Series B, Physical and Biological Sciences·Kazushige Obara
Feb 2, 2021·Philosophical Transactions. Series A, Mathematical, Physical, and Engineering Sciences·Whitney M Behr, Roland Bürgmann

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