Publication Date:
2017-04-03
Description:
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.
Description:
Published
Description:
L08305
Description:
3.1. Fisica dei terremoti
Description:
JCR Journal
Description:
reserved
Keywords:
Non volcanic tremor
;
dehydration reactions
;
04. Solid Earth::04.04. Geology::04.04.99. General or miscellaneous
Repository Name:
Istituto Nazionale di Geofisica e Vulcanologia (INGV)
Type:
article
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