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Authors: Burlini, L.*
Di Toro, G.*
Meredith, P.*
Title: Seismic tremor in subduction zones: the rock-physics evidence
Title of journal: Geophysical Research Letters
Series/Report no.: /36 (2009)
Publisher: AGU
Issue Date: 2009
DOI: 10.1029/2009GL037735
Keywords: Non volcanic tremor
dehydration reactions
Abstract: Episodic tremor and slip (ETS) have been correlated with rupture phenomena in subducting oceanic lithosphere at 30–45 km depth, where high VP/VS ratios, which suggest high-fluid pressures, have been observed. ETS, by accommodating slip in the down-dip portion of the subduction zone, may trigger megathrust earthquakes up-dip in the locked section. During dehydration experiments on serpentinite (typical rock of the oceanic lithosphere) at temperatures found in nature at 30–45 km depth (400– 550 C), we observe seismic signals in the form of acoustic emissions that closely resemble low frequency earthquakes, seismic tremor and regular earthquakes. Our findings support the concept that water released during dehydration reactions increases the pore pressures and can trigger ETS and regular earthquakes by reducing slip resistance. Citation: Burlini, L., G. Di Toro, and P. Meredith (2009), Seismic tremor in subduction zones: Rock physics evidence, Geophys. Res. Lett., 36, L08305, doi:10.1029/2009GL037735.
Appears in Collections:Papers Published / Papers in press
04.04.99. General or miscellaneous

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