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Title: Long-Time Relaxation Induced by Dynamic Forcing in Geomaterials

Abstract

We introduce a theoretical model and experimental evidence of the long-time relaxation process (slow dynamics) in rocks and other geomaterials following a dynamic wave excitation, at scales ranging from the laboratory to the Earth. The model is based on the slow recovery of an ensemble of grain contacts and asperities broken by a mechanical impact. It includes an Arrhenius-type equation for recovery of the metastable, broken contacts. The model provides a characteristic size of the broken contacts (order 10–9 m) and predicts that their number increases with impact amplitude. Theoretical results are in sufficient agreement with the laboratory and field data in that they suggest both the logarithmic law of recovery rate and deviations from this law.

Authors:
ORCiD logo [1];  [2]; ORCiD logo [3]; ORCiD logo [3]; ORCiD logo [4]; ORCiD logo [5]; ORCiD logo [5]
  1. Univ. of Colorado, Boulder, CO (United States); Univ. of North Carolina, Chapel Hill, NC (United States); Russian Academy of Sciences (RAS), Nizhnyi Novgorod (Russian Federation)
  2. Russian Academy of Sciences (RAS), Nizhnyi Novgorod (Russian Federation)
  3. Pennsylvania State Univ., University Park, PA (United States)
  4. Univ. of Memphis, TN (United States)
  5. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Publication Date:
Research Org.:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org.:
USDOE Office of Science (SC). Basic Energy Sciences (BES) (SC-22); USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1544732
Alternate Identifier(s):
OSTI ID: 1523559
Report Number(s):
LA-UR-18-31318
Journal ID: ISSN 2169-9313
Grant/Contract Number:  
89233218CNA000001
Resource Type:
Accepted Manuscript
Journal Name:
Journal of Geophysical Research. Solid Earth
Additional Journal Information:
Journal Volume: 124; Journal Issue: 5; Journal ID: ISSN 2169-9313
Publisher:
American Geophysical Union
Country of Publication:
United States
Language:
English
Subject:
Slow Dynamics; Elasticity and anelasticity; Nonlinear elastic properties of rock; Earthquake dynamics; Nonlinear wave propagation

Citation Formats

Ostrovsky, Lev, Lebedev, A., Riviere, J., Shokouhi, Parisa, Wu, C., Stuber Geesey, Marcie Alberta, and Johnson, Paul Allan. Long-Time Relaxation Induced by Dynamic Forcing in Geomaterials. United States: N. p., 2019. Web. doi:10.1029/2018JB017076.
Ostrovsky, Lev, Lebedev, A., Riviere, J., Shokouhi, Parisa, Wu, C., Stuber Geesey, Marcie Alberta, & Johnson, Paul Allan. Long-Time Relaxation Induced by Dynamic Forcing in Geomaterials. United States. doi:10.1029/2018JB017076.
Ostrovsky, Lev, Lebedev, A., Riviere, J., Shokouhi, Parisa, Wu, C., Stuber Geesey, Marcie Alberta, and Johnson, Paul Allan. Tue . "Long-Time Relaxation Induced by Dynamic Forcing in Geomaterials". United States. doi:10.1029/2018JB017076.
@article{osti_1544732,
title = {Long-Time Relaxation Induced by Dynamic Forcing in Geomaterials},
author = {Ostrovsky, Lev and Lebedev, A. and Riviere, J. and Shokouhi, Parisa and Wu, C. and Stuber Geesey, Marcie Alberta and Johnson, Paul Allan},
abstractNote = {We introduce a theoretical model and experimental evidence of the long-time relaxation process (slow dynamics) in rocks and other geomaterials following a dynamic wave excitation, at scales ranging from the laboratory to the Earth. The model is based on the slow recovery of an ensemble of grain contacts and asperities broken by a mechanical impact. It includes an Arrhenius-type equation for recovery of the metastable, broken contacts. The model provides a characteristic size of the broken contacts (order 10–9 m) and predicts that their number increases with impact amplitude. Theoretical results are in sufficient agreement with the laboratory and field data in that they suggest both the logarithmic law of recovery rate and deviations from this law.},
doi = {10.1029/2018JB017076},
journal = {Journal of Geophysical Research. Solid Earth},
number = 5,
volume = 124,
place = {United States},
year = {2019},
month = {4}
}

Journal Article:
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This content will become publicly available on April 30, 2020
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