Subdaily Slow Fault Slip Dynamics Captured by Low‐Frequency Earthquakes
Name
AGU Advances - 2023 - Mouchon - Subdaily Slow Fault Slip Dynamics Captured by Low‐Frequency Earthquakes.pdf
Description
Published version
Size
1.54 MB
Format
Adobe PDF
Checksum (MD5)
79e4389f0e4ee20b3f960b19270888d7
Author(s)
Mouchon, Caroline
Frank, William B
Radiguet, Mathilde
Poli, Piero
Cotte, Nathalie
Date Issued
June 28, 2023
Journal
AGU Advances
Publisher
American Geophysical Union
Citation
Mouchon, C., Frank, W. B., Radiguet, M., Poli, P., & Cotte, N. (2023). Subdaily slow fault slip dynamics captured by low-frequency earthquakes. AGU Advances, 4, e2022AV000848.
Version
Final published version
Abstract
Geodetic positioning is the geophysical record of reference for slow slip events, but typical daily solutions limit studies of the evolution of slow slip to its long‐term dynamics. Accompanying seismic low‐frequency earthquakes located precisely in time and space provide an opportunity to image slow slip dynamics at subdaily time scales. Here we show that a high‐resolution time history of low‐frequency earthquake fault slip alone can reproduce the geodetic record of slow slip that we observe to be dominated by subdaily fault slip dynamics. However, a simple linear model cannot accommodate the complex dynamics present throughout the slow slip cycle, and an analysis of different phases of the slow slip cycle shows that the ratio of geodetic to seismic fault slip varies as a function of time. This suggests that the low‐frequency earthquake source region saturates as slow slip grows in moment and area. We propose that rheological heterogeneities at the plate boundary associated with low‐frequency earthquakes do not play a significant role in the slow slip rupture process, thus implying that their activity is incidental to the driving aseismic slip.
MIT Department
Massachusetts Institute of Technology. Department of Earth, Atmospheric, and Planetary Sciences
Terms of Use
Creative Commons Attribution
Persistent DSpace Link
DOI of Published Version
10.1029/2022av000848
