Mechanochemistry: an hypothesis for shallow earthquakes

Details Mechanochemistry: an hypothesis for shallow earthquakes Mechanochemistry: an hypothesis for shallow earthquakes

1998-07-30

arxiv.org/abs/cond-mat/9807400v1

Physics

Condensed Matter

Materials Science

36 pages, 2 ps figures, to appear in "Earthquake Thermodynamics and Phase Transformations in the Earth's Interior" - Roman Tei

Scientific paper

We advance the novel hypothesis that water in the presence of finite localized strain within fault gouges may lead to the phase transformation of stable minerals into metastable polymorphs of higher free energy density. Under increasing strain, the transformed minerals eventually become unstable, as shown from an application of Landau theory of structural phase transitions. We propose that this instability leads to an explosive transformation, creating a slightly supersonic shock wave propagating along the altered fault core leaving a wake of shaking fragments. As long as the resulting high-frequency acoustic waves remain of sufficient amplitude to lead to a fluidization of the fault core, the fault is unlocked and free to slip under the effect of the tectonic stress, thus releasing the elastic part of the stored energy. We briefly discuss observations that could be understood within this theory.

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