Machine Learning Reveals the State of Intermittent Frictional Dynamics in a Sheared Granular Fault
- Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
- Univ. of Oxford (United Kingdom); Federal Inst. of Technology, Zurich (Switzerland)
- Swiss Federal Lab. for Materials Science and Technology (Empa), Dübendorf (Switzerland)
- Federal Inst. of Technology, Zurich (Switzerland)
Seismogenic plate boundaries are posited to behave in a similar manner to a densely packed granular medium, where fault and block systems rapidly rearrange the distribution of forces within themselves, as particles do in slowly sheared granular systems. Machine learning is used to show that statistical features of velocity signals from individual particles in a simulated sheared granular fault contain information regarding the instantaneous global state of intermittent frictional stick-slip dynamics. We demonstrate that combining features built from the signals of more particles can improve the accuracy of the global model and discuss the physical basis behind the decrease in error. We show that the statistical features such as median and higher moments of the signals that represent the particle displacement in the direction of shearing are among the best predictive features. We demonstrate here novel insights into the applications of machine learning in studying frictional processes occurring in geophysical systems.
- Research Organization:
- Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
- Sponsoring Organization:
- USDOE National Nuclear Security Administration (NNSA); USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Chemical Sciences, Geosciences & Biosciences Division
- Grant/Contract Number:
- 89233218CNA000001
- OSTI ID:
- 1544741
- Report Number(s):
- LA-UR--19-22300
- Journal Information:
- Geophysical Research Letters, Journal Name: Geophysical Research Letters Journal Issue: 13 Vol. 46; ISSN 0094-8276
- Publisher:
- American Geophysical UnionCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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