Thermo‐poro‐mechanics of chemically active creeping faults: 2. Transient considerations

Journal of Geophysical Research: Solid Earth - Tập 119 Số 6 - Trang 4583-4605 - 2014
Manolis Veveakis1,2, Thomas Poulet1, Sotiris Alevizos3
1CSIRO Earth Science and Resource Engineering, ARRC; Kensington Western Australia Australia
2School of Mathematics and Statistics, University of Western Australia, Perth, Western Australia, Australia
3Department of Mechanics, School of Applied Mathematical and Physical Sciences, National Technical University of Athens, Athens, Greece

Tóm tắt

AbstractThis work studies the transient behavior of a chemically active, fluid‐saturated fault zone under shear. These fault zones are displaying a plethora of responses spanning from ultrafast instabilities, like thermal pressurization, to extremely slow creep localization events on geological timescales. These instabilities can be described by a single model of a rate‐dependent and thermally dependent fault, prone to fluid release reactions at critical temperatures which was introduced in our companion work. In this study we integrate it in time to provide regimes of stable creep, nonperiodic and periodic seismic slip events due to chemical pressurization, depending on the physical properties of the fault material. It is shown that this chemically induced seismic slip takes place in an extremely localized band, several orders of magnitude narrower than the initial shear zone, which is indeed the signature field observation. Furthermore, in the field and in laboratory experiments the ultralocalized deformation is embedded in a chemical process zone that forms part of the shear zone. The width of this zone is shown here to depend on the net activation energy of the chemical reaction. The larger the difference in forward and backward activation energies, the narrower is the chemical process zone. We apply the novel findings to invert the physical parameters from a 16year GPS observation of the Cascadia episodic tremor and slip events and show that this sequence is the fundamental mode of a serpentinite oscillator defined by slow strain localization accompanying shear heating and chemical dehydration reaction at the critical point, followed by diffusion and backward reaction leading the system back to slow slip.

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Journal of Geophysical Research: Solid Earth

Tập 119 Số 6

4583-4605

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