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Frequency–Magnitude Statistics of Laboratory Foreshocks Vary With Shear Velocity, Fault Slip Rate, and Shear Stress

Journal Article · · Journal of Geophysical Research. Solid Earth
DOI:https://doi.org/10.1029/2021jb022175· OSTI ID:1831052
 [1];  [2];  [3];  [4]
  1. Univ. of Texas Inst. for Geophysics, Austin, TX (United States); Pennsylvania State Univ
  2. Univ. of Texas Inst. for Geophysics, Austin, TX (United States)
  3. Pennsylvania State Univ., University Park, PA (United States)
  4. La Sapienza Univ. di Roma (Italy)
+ Show Author Affiliations
Understanding the nucleation phase of earthquakes is key for advancing earthquake hazard assessment and improving earthquake early warning systems. However, little progress has been made in this area due to a poor understanding of nucleation processes and incomplete seismic and fault zone measurements. The ability to integrate measured fault zone properties with seismic data could significantly improve our understanding of how earthquakes begin and whether there are systematic variations in seismic properties preceding failure. In this work, we use high-resolution laboratory measurements of fault zone properties along with acoustic emission data to document temporal variations of foreshock properties. Our data show that foreshock size increases with shear stress, loading rate, and fault slip rate. We propose that the preseismic fault slip rate and fault zone thickness (i.e., porosity) work in concert to modulate foreshock properties.
Research Organization:
Pennsylvania State Univ., University Park, PA (United States); Pennsylvania State University, University Park, PA (United States)
Sponsoring Organization:
US National Science Foundtion; USDOE Office of Energy Efficiency and Renewable Energy (EERE), Renewable Power Office. Geothermal Technologies Office; USDOE Office of Science (SC), Basic Energy Sciences (BES). Chemical Sciences, Geosciences & Biosciences Division
Grant/Contract Number:
EE0008763; SC0020512
OSTI ID:
1831052
Alternate ID(s):
OSTI ID: 2539921
Journal Information:
Journal of Geophysical Research. Solid Earth, Journal Name: Journal of Geophysical Research. Solid Earth Journal Issue: 11 Vol. 126; ISSN 2169-9313
Publisher:
American Geophysical UnionCopyright Statement
Country of Publication:
United States
Language:
English

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