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Micro/Nano-scale Strain Distribution Measurement from Sampling Moiré Fringes
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Nanostructures as indicator for deformation dynamics.

Sarah Incel1, Markus Ohl2,3, Frans Aben4

  • 1GFZ Helmholtz Centre for Geosciences, Potsdam, Germany. sarah.incel@gfz.de.

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|December 8, 2025
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Summary
This summary is machine-generated.

Fault gouge structure formation is linked to deformation rate, not total energy. Even small earthquakes (Mw < 2) can create fault textures previously thought to require significant slip or conditions.

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Area of Science:

  • Geophysics
  • Rock Mechanics
  • Materials Science

Background:

  • Fault gouge formation is crucial for understanding earthquake dynamics.
  • Gouge textures are typically associated with large displacements and high P/T conditions.
  • The feedback between fault slip and gouge evolution is not fully understood.

Purpose of the Study:

  • To investigate the relationship between fault slip dynamics and the resulting gouge structures.
  • To determine how deformation rate influences gouge amorphization and nanostructure.
  • To assess the impact of gouge material on fault strength evolution.

Main Methods:

  • Experiments on intact granite under varying slip rates (quasi-static to fully dynamic).
  • Inclusion of fluid conditions and limited slip displacements (max. 4 mm).
  • Analysis of gouge nanostructure, amorphization, and evidence of melting (e.g., magnetite nanograins).

Main Results:

  • Gouge amorphization extent positively correlates with deformation rate.
  • Melting evidence (magnetite nanograins) observed at the highest slip rates.
  • Gouge nanostructure correlates with power dissipation, not total energy input.
  • Amorphous gouge material did not significantly impact strength evolution during rupture.

Conclusions:

  • Fault gouge textures can form during small earthquakes (Mw < 2) in the upper crust from initially intact materials.
  • Deformation rate is a key factor in gouge amorphization and nanostructure development.
  • These findings challenge previous assumptions about the conditions required for gouge texture formation.