Shallow Slow Slip Events in the Imperial Valley With Along‐Strike Propagation
Name
Geophysical Research Letters - 2024 - Materna - Shallow Slow Slip Events in the Imperial Valley With Along‐Strike.pdf
Description
Published version
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4.59 MB
Format
Adobe PDF
Checksum (MD5)
315db07849896e47c83b6ab19ddb92dc
Author(s)
Materna, Kathryn
Bürgmann, Roland
Lindsay, Danielle
Bilham, Roger
Herring, Thomas
Crowell, Brendan
Szeliga, Walter
Date Issued
June 19, 2024
Journal
Geophysical Research Letters
Publisher
American Geophysical Union
Citation
Materna, K., Bürgmann, R., Lindsay, D., Bilham, R., Herring, T., Crowell, B., & Szeliga, W. (2024). Shallow slow slip events in the Imperial Valley with along-strike propagation. Geophysical Research Letters, 51, e2023GL108089.
Version
Final published version
Abstract
Shallow creep events provide opportunities to understand the mechanical properties and behavior of faults. However, due to physical limitations observing creep events, the precise spatio‐temporal evolution of slip during creep events is not well understood. In 2023, the Superstition Hills and Imperial faults in California each experienced centimeter‐scale slip events that were captured in unprecedented detail by satellite radar, sub‐daily Global Navigation Satellite Systems, and creepmeters. In both cases, the slip propagated along the fault over 2–3 weeks. The Superstition Hills event propagated bilaterally away from its initiation point at average velocities of ∼9 km/day, but propagation velocities were locally much higher. The ruptures were consistent with slip from tens of meters to ∼2 km depths. These slowly propagating events reveal that the shallow crust of the Imperial Valley does not obey purely velocity‐strengthening or velocity‐weakening rate‐and‐state friction, but instead requires the consideration of fault heterogeneity or fault‐frictional behaviors such as dilatant strengthening.
Description
Article relates to: Vavra, E. J., Fialko, Y., Rockwell, T., Bilham, R., Štěpančíková, P., Stemberk, J., et al. (2024). Characteristic slow-slip events on the Superstition Hills Fault, Southern California. Geophysical Research Letters, 51, e2023GL107244. https://doi.org/10.1029/2023GL107244
MIT Department
Massachusetts Institute of Technology. Department of Geology and Geophysics
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Creative Commons Attribution
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DOI of Published Version
10.1029/2023gl108089
