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Title: Geodetic Measurements of Slow-Slip Events Southeast of Parkfield, CA

Abstract

Tremor and low-frequency earthquakes are presumed to be indicative of surrounding slow, aseismic slip that is often below geodetic detection thresholds. This study uses data from borehole seismometers and long-baseline laser strainmeters to observe both the seismic and geodetic signatures of episodic tremor and slip on the Parkfield region of the San Andreas Fault near Cholame, CA. We note the observed occurrence rates of both the tremors and co-located families of low-frequency earthquakes are not steady but instead exhibit quasiperiodic bursts of increased activity.We show that these periods of elevated seismic activity correlate with statistically significant stacked strain signals consisting of 44 slow-slip events. Modeled individual slow-slip events and their total summed moment, which are constrained by seismic signals and stacked strain, respectively, indicate that the individual moment magnitudes of these events range from $$M_w$$ 4.6–5.2.We find that the measured geodetic signal likely precedes the seismic signal by several hours, consistent with the aseismic slip preceding and driving the observed seismic tremor activity.We confirm that strike-slip faults, in addition to subduction zones, are capable of producing episodic tremor and slip.

Authors:
ORCiD logo [1]; ORCiD logo [2]; ORCiD logo [3]; ORCiD logo [4]; ORCiD logo [3]
  1. Univ. of California, Berkeley, CA (United States); Harvard Univ., Cambridge, MA (United States)
  2. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  3. Univ. of California, Berkeley, CA (United States)
  4. U.S. Geological Survey, Golden, CO (United States). Geologic Hazards Science Center
Publication Date:
Research Org.:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA), Office of Defense Nuclear Nonproliferation; National Science Foundation (NSF); National Aeronautics and Space Administration (NASA)
OSTI Identifier:
1630866
Report Number(s):
LA-UR-19-31259
Journal ID: ISSN 2169-9313
Grant/Contract Number:  
89233218CNA000001; 1460498; DGE1106400; EAR-1724794
Resource Type:
Accepted Manuscript
Journal Name:
Journal of Geophysical Research. Solid Earth
Additional Journal Information:
Journal Volume: 125; Journal Issue: 5; Journal ID: ISSN 2169-9313
Publisher:
American Geophysical Union
Country of Publication:
United States
Language:
English
Subject:
58 GEOSCIENCES; California; earthquakes; geodesy; seismology; slow slip; tremor; San Andreas Fault; detection

Citation Formats

Delbridge, Brent G., Carmichael, Joshua Daniel, Nadeau, Robert M., Shelly, David R., and Bürgmann, Roland. Geodetic Measurements of Slow-Slip Events Southeast of Parkfield, CA. United States: N. p., 2020. Web. doi:10.1029/2019JB019059.
Delbridge, Brent G., Carmichael, Joshua Daniel, Nadeau, Robert M., Shelly, David R., & Bürgmann, Roland. Geodetic Measurements of Slow-Slip Events Southeast of Parkfield, CA. United States. doi:https://doi.org/10.1029/2019JB019059
Delbridge, Brent G., Carmichael, Joshua Daniel, Nadeau, Robert M., Shelly, David R., and Bürgmann, Roland. Thu . "Geodetic Measurements of Slow-Slip Events Southeast of Parkfield, CA". United States. doi:https://doi.org/10.1029/2019JB019059. https://www.osti.gov/servlets/purl/1630866.
@article{osti_1630866,
title = {Geodetic Measurements of Slow-Slip Events Southeast of Parkfield, CA},
author = {Delbridge, Brent G. and Carmichael, Joshua Daniel and Nadeau, Robert M. and Shelly, David R. and Bürgmann, Roland},
abstractNote = {Tremor and low-frequency earthquakes are presumed to be indicative of surrounding slow, aseismic slip that is often below geodetic detection thresholds. This study uses data from borehole seismometers and long-baseline laser strainmeters to observe both the seismic and geodetic signatures of episodic tremor and slip on the Parkfield region of the San Andreas Fault near Cholame, CA. We note the observed occurrence rates of both the tremors and co-located families of low-frequency earthquakes are not steady but instead exhibit quasiperiodic bursts of increased activity.We show that these periods of elevated seismic activity correlate with statistically significant stacked strain signals consisting of 44 slow-slip events. Modeled individual slow-slip events and their total summed moment, which are constrained by seismic signals and stacked strain, respectively, indicate that the individual moment magnitudes of these events range from $M_w$ 4.6–5.2.We find that the measured geodetic signal likely precedes the seismic signal by several hours, consistent with the aseismic slip preceding and driving the observed seismic tremor activity.We confirm that strike-slip faults, in addition to subduction zones, are capable of producing episodic tremor and slip.},
doi = {10.1029/2019JB019059},
journal = {Journal of Geophysical Research. Solid Earth},
number = 5,
volume = 125,
place = {United States},
year = {2020},
month = {3}
}

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