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The Spectrum of Slip Behaviors of a Granular Fault Gouge Analogue Governed by Rate and State Friction

Rudolf, Michael ; Rosenau, Matthias ; Oncken, Onno (2023)
The Spectrum of Slip Behaviors of a Granular Fault Gouge Analogue Governed by Rate and State Friction.
In: Geochemistry, Geophysics, Geosystems, 2021, 22 (12)
doi: 10.26083/tuprints-00020990
Article, Secondary publication, Publisher's Version

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Item Type: Article
Type of entry: Secondary publication
Title: The Spectrum of Slip Behaviors of a Granular Fault Gouge Analogue Governed by Rate and State Friction
Language: English
Date: 11 December 2023
Place of Publication: Darmstadt
Year of primary publication: 2021
Place of primary publication: Hoboken
Publisher: Wiley
Journal or Publication Title: Geochemistry, Geophysics, Geosystems
Volume of the journal: 22
Issue Number: 12
Collation: 28 Seiten
DOI: 10.26083/tuprints-00020990
Corresponding Links:
Origin: Secondary publication DeepGreen
Abstract:

Currently, it is unknown how seismic and aseismic slip influences the recurrence and magnitude of earthquakes. Modern seismic hazard assessment is therefore based on statistics combined with numerical simulations of fault slip and stress transfer. To improve the underlying statistical models we conduct low velocity shear experiments with glass micro‐beads as fault gouge analogue at confining stresses of 5–20 kPa. As a result, we show that characteristic slip events emerge, ranging from fast and large slip to small scale oscillating creep and stable sliding. In particular, we observe small scale slip events that occur immediately before large scale slip events for a specific set of experiments. Similar to natural faults we find a separation of scales by several orders of magnitude for slow events and fast events. Enhanced creep and transient dilatational events pinpoint that the granular analogue is close to failure. From slide‐hold‐slide tests, we find that the rate‐and‐state properties are in the same range as estimates for natural faults and fault rocks. The fault shows velocity weakening characteristics with a reduction of frictional strength between 0.8% and 1.3% per e‐fold increase in sliding velocity. Furthermore, the slip modes that are observed in the normal shear experiments are in good agreement with analytical solutions. Our findings highlight the influence of micromechanical processes on macroscopic fault behavior. The comprehensive data set associated with this study can act as a benchmark for numerical simulations and improve the understanding of observations of natural faults.

Uncontrolled Keywords: rate‐state parameters, ring‐shear tester, glassy microspheres, analogue models of geologic processes
Identification Number: e2021GC009825
Status: Publisher's Version
URN: urn:nbn:de:tuda-tuprints-209903
Classification DDC: 500 Science and mathematics > 550 Earth sciences and geology
Divisions: 11 Department of Materials and Earth Sciences > Earth Science > Engineering Geology
Date Deposited: 11 Dec 2023 14:01
Last Modified: 26 Feb 2024 09:15
SWORD Depositor: Deep Green
URI: https://tuprints.ulb.tu-darmstadt.de/id/eprint/20990
PPN: 515771139
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