Probing the northern Chile megathrust with seismicity: The 2014 M8.1 Iquique earthquake sequence
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985530%3A_____%2F19%3A00522087" target="_blank" >RIV/67985530:_____/19:00522087 - isvavai.cz</a>
Result on the web
<a href="https://agupubs.onlinelibrary.wiley.com/doi/abs/10.1029/2019JB017794" target="_blank" >https://agupubs.onlinelibrary.wiley.com/doi/abs/10.1029/2019JB017794</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1029/2019JB017794" target="_blank" >10.1029/2019JB017794</a>
Alternative languages
Result language
angličtina
Original language name
Probing the northern Chile megathrust with seismicity: The 2014 M8.1 Iquique earthquake sequence
Original language description
We used data from >100 permanent and temporary seismic stations to investigate seismicity patterns related to the 1 April 2014 M8.1 Iquique earthquake in northern Chile. Applying a multistage automatic event location procedure to the seismic data, we detected and located 19,000 foreshocks, aftershocks, and background seismicity for 1 month preceding and 9 months following the mainshock. Foreshocks skirt around the updip limit of the mainshock asperity, aftershocks occur mainly in two belts updip and downdip of it. The updip seismicity primarily locates in a zone of transitional friction on the megathrust and can be explained by preseismic stress loading due to slow-slip processes and afterslip driven by increased Coulomb failure stress due to the mainshock and its largest aftershock. Afterslip further south also triggered aftershocks and repeating earthquakes in several EW striking streaks. We interpret the streaks as markers of surrounding creep that could indicate a change in fault mechanics and may have structural origin, caused by fluid-induced failure along presumed megathrust corrugations. Megathrust aftershocks terminate updip below the seaward frontal prism in the outer continental wedge that probably behaves aseismically under velocity-strengthening conditions. The inner wedge locates further landward overlying the megathrust's seismogenic zone. Further downdip, aftershocks anticorrelate with the two major afterslip patches resolved geodetically and partially correlate with increased Coulomb failure stress, overall indicating heterogeneous frictional behavior. A region of sparse seismicity at 40- to 50-km depth is followed by the deepest plate interface aftershocks at 55- to 65-km depth, which occur in two clusters of significantly different dip.
Czech name
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Czech description
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Classification
Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
10507 - Volcanology
Result continuities
Project
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Continuities
I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace
Others
Publication year
2019
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
Journal of Geophysical Research: Solid Earth
ISSN
2169-9313
e-ISSN
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Volume of the periodical
124
Issue of the periodical within the volume
12
Country of publishing house
US - UNITED STATES
Number of pages
20
Pages from-to
12935-12954
UT code for WoS article
000500672800001
EID of the result in the Scopus database
2-s2.0-85076136558