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Eijsink, Agathe; Ikari, Matt J (2023): Varying the fault-normal and shear-parallel stiffness during laboratory shear experiments [dataset bundled publication]. PANGAEA, https://doi.org/10.1594/PANGAEA.959038

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Published: 2023-06-06 • DOI registered: 2024-03-22

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Abstract:
The potential of faults to show earthquake-generating slip instabilities depends not only on the intrinsic frictional properties of the fault zone, but also on the elasticity of the surrounding material. A velocity-weakening fault is expected to show increasingly unstable frictional behavior with decreasing stiffness parallel to the shearing direction. The roughness of fault planes can cause slip in the shear direction to be accompanied by fault-normal movement, working against stiffness in the fault-normal direction. In this dataset, we report on laboratory friction experiments in which we systematically vary the stiffness surrounding the fault in both the shear-parallel and fault-normal directions, to investigate under which conditions slip instabilities can occur. The experiments were performed using synthetic quartz powder in a single-direct shear device. We report the frictional strength, the frictional sliding stability following the rate-and-state frictional framework, and statistics of the slip events. Reducing the shear-parallel stiffness causes the known transition from stable sliding to slow slip to fast stick-slip, whereas reducing the fault-normal stiffness causes stick-slip instabilities without transitional slow events, and reduced stiffness in both directions produces complex behavior.
Keyword(s):
fault stiffness; friction; laboratory friction experiments; slip stability
Supplement to:
Eijsink, Agathe; Ikari, Matt J (2024): How Fault‐Normal and Shear‐Parallel Stiffness Influence Frictional Sliding Behavior. Journal of Geophysical Research: Solid Earth, 129(2), e2023JB027193, https://doi.org/10.1029/2023JB027193
Project(s):
Center for Marine Environmental Sciences (MARUM)
Funding:
European Research Council (ERC), grant/award no. 714430: Plate-rate experimental deformation: Aseismic, transient or seismic fault slip
License:
Creative Commons Attribution 4.0 International (CC-BY-4.0)
Size:
3 datasets

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Datasets listed in this bundled publication

  1. Eijsink, A; Ikari, MJ (2023): Measured rate-and-state friction coefficients, with input parameters for the forward model and the best fit model parameters as obtained by an inverse modelling technique during laboratory shear experiments. https://doi.org/10.1594/PANGAEA.959036
  2. Eijsink, A; Ikari, MJ (2023): Characteristics of all slip events occurring at the final velocity step where the sliding velocity is 10 um/s during laboratory shear experiments. https://doi.org/10.1594/PANGAEA.959032
  3. Eijsink, A; Ikari, MJ (2023): Measured friction coefficients during laboratory shear experiments. https://doi.org/10.1594/PANGAEA.959023