Along-Dip Segmentation of the Slip Behavior and Rheology of the Copiapó Ridge Subducted in North-Central Chile
Name
Geophysical Research Letters - 2022 - Pastén‐Araya - Along‐Dip Segmentation of the Slip Behavior and Rheology of the Copiap.pdf
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Author(s)
Pastén-Aray, F
Potin, B
Azúa
Sáez, M
Aden-Anton, F
Ruiz, S
Cabrera, L
Ampuero, J
Nocquet, J
Rivera, L
Date Issued
February 1, 2022
Journal
Geophysical Research Letters
Publisher
American Geophysical Union
Citation
Pastén-Araya, F., Potin, B., Azúa, K., Sáez, M., Aden-Antoniów, F., Ruiz, S., et al. (2022). Along-dip segmentation of the slip behavior and rheology of the Copiapó ridge subducted in north-central Chile. Geophysical Research Letters, 49, e2021GL095471.
Version
Final published version
Abstract
We studied the along-dip influence of the Copiapó ridge subduction in the Atacama region, North-Central Chile by building a new seismicity catalog, including similar events and non-volcanic tremors (NVTs). We also obtained a 3-D tomographic model for P and S-waves velocity (and the implied Vp/Vs ratio). We identify along-dip segmentation involving four distinct segments: a locked seismogenic zone hosting ordinary seismicity and clusters of similar events; a transition zone with NVTs and low seismicity; an aseismic zone with slow-slip events; and a deep zone with abundant intraslab seismicity. The velocity models show differences among these zones, with low velocity anomalies of Vp and Vs coinciding with aseismic slip zones, indicating the possible presence of fluids. Due to the spatial distribution along-strike and along-dip of the aseismic zones, we propose that these differences in seismogenic behavior are generated by subduction of the heterogeneous seamounts associated with the Copiapó ridge.
MIT Department
Massachusetts Institute of Technology. Department of Earth, Atmospheric, and Planetary Sciences
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DOI of Published Version
https://doi.org/10.1029/2021GL095471
