Coseismic recrystallization during shallow earthquake slip
By Steven A. Smith, G. Toro, S. Kim, J. Ree, S. Nielsen, A. Billi, R. Spiess. 2012
134 citations recorded by the source corpus.
Solidified frictional melts, or pseudotachylytes, remain the only unambiguous indicator of seismic slip in the geological record. However, pseudotachylytes form at >5 km depth, and there are many rock types in which they do not form at all. We performed low- to high-velocity rock friction experiments designed to impose realistic coseismic slip pulses on calcite fault gouges, and report that localized dynamic recrystallization may be an easy-to-recognize microstructural indicator of seismic slip in shallow, otherwise brittle fault zones. Calcite gouges with starting grain size −1 , and total displacements between 1 and 4 m. At coseismic slip velocities ≥0.1 m s −1 , the gouges were cut by reflective principal slip surfaces lined by polygonal grains 2 + CaO. The recrystallized calcite aggregates resemble those found along the principal slip surface of the Garam thrust, South Korea, exhumed from
Subfields: Geophysics
View Paper: https://www.semanticscholar.org/paper/edb247742b10d0d9a8057f0f356aaa605bab7461
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In Geophysics
Citations in the corpus
- Mirror-like faults and power dissipation during earthquakes (2013, methodology): “Before each experiment 5 g of dolostone gouge was homogeneously distributed in the gouge holder between the two confinement rings (for details of the gouge holder and calibration tests see Smith et al., 2013) and loaded up to 1.6 MPa using an air press.”
- Nanograins form carbonate fault mirrors (2013, background): “Figure 2 - Locations of studied faults ((1) Kfar Giladi (2) Nahal Avinadav, (3) Yair, and (4) Nahal Uziyahu) and the main fault systems in the area.”