Non-volcanic tremor and discontinuous slab dehydration

Details Non-volcanic tremor and discontinuous slab dehydration Non-volcanic tremor and discontinuous slab dehydration

Aug 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011georl..3815302f&link_type=abstract

Geophysical Research Letters, Volume 38, Issue 15, CiteID L15302

Physics

1

Mineralogy And Petrology: Fluid Flow, Mineralogy And Petrology: Metamorphic Petrology, Seismology: Seismicity And Tectonics (1207, 1217, 1240, 1242), Tectonophysics: Dynamics And Mechanics Of Faulting (8004), Tectonophysics: Subduction Zone Processes (1031, 3060, 3613, 8413)

Scientific paper

Non-volcanic tremor is a recently discovered fault slip style occurring with remarkable regularity in space near the down-dip end of the locked zone on several subduction thrust interfaces. The physical mechanisms and the controls on the location of tremor have not yet been determined. We calculate the stable mineral assemblages and their water content in the subducting slab, and find that slab dehydration is not continuous, but rather restricted to a few reactions localised in pressure-temperature space. Along geothermal gradients applicable to Shikoku and Cascadia - where tremor has been relatively easy to detect - tremor locations correlate with discontinuous and localised voluminous water release from the breakdown of lawsonite and chlorite + glaucophane respectively. The shape of the pressure-temperature path for subducting slabs prevents fluid release at depths above and below where these dehydration reactions occur. We conclude that abundant tremor activity requires metamorphic conditions where localised dehydration occurs during subduction, and this may explain why tremor appears more abundant in some subduction zones than others.

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