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Coseismic slip and afterslip of the 2015 Mw 8.3 Illapel (Chile) earthquake determined from continuous GPS data

Authors

Shrivastava,  Mahesh N.
External Organizations;

González,  Gabriel
External Organizations;

/persons/resource/marcos

Moreno,  M.
4.1 Lithosphere Dynamics, 4.0 Geomaterials, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;

Chlieh,  Mohamed
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Salazar,  Pablo
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Reddy,  C. D.
External Organizations;

Báez,  Juan Carlos
External Organizations;

Yáñez,  Gonzalo
External Organizations;

González,  Juan
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de la Llera,  Juan Carlos
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Fulltext (public)

1868898.pdf
(Publisher version), 972KB

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Citation

Shrivastava, M. N., González, G., Moreno, M., Chlieh, M., Salazar, P., Reddy, C. D., Báez, J. C., Yáñez, G., González, J., de la Llera, J. C. (2016): Coseismic slip and afterslip of the 2015 Mw 8.3 Illapel (Chile) earthquake determined from continuous GPS data. - Geophysical Research Letters, 43, 20, 10710-10719.
https://doi.org/10.1002/2016GL070684


Cite as: https://gfzpublic.gfz-potsdam.de/pubman/item/item_1868898
Abstract
We analyzed the coseismic and early postseismic deformation of the 2015, Mw 8.3 Illapel earthquake by inverting 13 continuous GPS time series. The seismic rupture concentrated in a shallow (<20 km depth) and 100 km long asperity, which slipped up to 8 m, releasing a seismic moment of 3.6 × 1021 Nm (Mw = 8.3). After 43 days, postseismic afterslip encompassed the coseismic rupture. Afterslip concentrated in two main patches of 0.50 m between 20 and 40 km depth along the northern and southern ends of the rupture, partially overlapping the coseismic slip. Afterslip and aftershocks confined to region of positive Coulomb stress change, promoted by the coseismic slip. The early postseismic afterslip was accommodated ~53% aseismically and ~47% seismically by aftershocks. The Illapel earthquake rupture is confined by two low interseismic coupling zones, which coincide with two major features of the subducting Nazca Plate, the Challenger Fault Zone and Juan Fernandez Ridge.