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GPS deformation related to the M_w 7.3, 2014, Papanoa earthquake (Mexico) reveals the aseismic behavior of the Guerrero seismic gap

Gualandi, A. and Perfettini, H. and Radiguet, M. and Cotte, N. and Kostoglodov, V. (2017) GPS deformation related to the M_w 7.3, 2014, Papanoa earthquake (Mexico) reveals the aseismic behavior of the Guerrero seismic gap. Geophysical Research Letters, 44 (12). pp. 6039-6047. ISSN 0094-8276. https://resolver.caltech.edu/CaltechAUTHORS:20170803-074114168

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Abstract

We present the study of 21 continuous GPS (cGPS) stations in Mexico during the time interval that goes from 1 October 2013 to 31 December 2014. The area under investigation produced a slow slip event (SSE) that started in February 2014 and lasted at least until December 2014. Superimposed on this transient signal, the M_w 7.3 Papanoa earthquake struck the region on 18 April 2014 and affected multiple stations. Thanks to an independent component analysis (ICA) technique we are able to separate the postseismic deformation associated with this earthquake from the deformation related to the ongoing SSE. We infer the slip distributions associated with the three tectonically related processes: the coseismic and postseismic slip and the SSE. The inferred postseismic slip distribution reduces the amount of slip related to the SSE in the updip portion of the slab. The moment released by the postseismic processes (afterslip and aftershocks) is estimated to be [8.06 ± 0.24] × 10^(19) Nm, equivalent to [71 ± 4]% of the moment associated with the main shock. More than 88% of the postseismic moment is released aseismically and the afterslip spatially correlates with the Guerrero seismic gap, suggesting that the region is controlled by stable sliding behavior and rate-strengthening frictional properties.


Item Type:Article
Related URLs:
URLURL TypeDescription
https://doi.org/10.1002/2017GL072913DOIArticle
http://onlinelibrary.wiley.com/doi/10.1002/2017GL072913/abstractPublisherArticle
ORCID:
AuthorORCID
Gualandi, A.0000-0002-3100-8932
Perfettini, H.0000-0001-6829-5472
Radiguet, M.0000-0002-3877-9393
Cotte, N.0000-0002-1596-0755
Kostoglodov, V.0000-0001-7169-3121
Additional Information:© 2017 American Geophysical Union. Received 2 FEB 2017; Accepted 19 MAY 2017; Accepted article online 1 JUN 2017; Published online 27 JUN 2017. SSN data were obtained by the Servicio Sismológico Nacional (México), station maintenance, data acquisition and distribution is thanks to its personnel. We appreciate the efforts of the Servicio Sismológico Nacional of Mexico, Jose Antonio Santiago, and Enrique Cabral Cano in maintaining GPS networks and supplying us the data. The figures have been created with the Generic Mapping Tool [Wessel et al., 2013]. A.G. thanks Jean-Philippe Avouac for financial support through the NSF grant EAR#B45136 and for his valuable comments. H.P., M.R., and N.C. have got financial support from LabexOSUG@2020, Investissements d'avenirANR10 LABX56, and from the French spatial agency CNES, project TOSCA SSEMEX. We thank Bernard Valette for the useful discussions on the inversion technique and regularization. We thank an anonimous reviewer and Tiegan Hobbs for the valuable comments.
Funders:
Funding AgencyGrant Number
NSFEAR-B45136
Agence Nationale pour la Recherche (ANR)LabexOSUG@2020
Agence Nationale pour la Recherche (ANR)ANR10 LABX56
Centre National d'Études Spatiales (CNES)UNSPECIFIED
Subject Keywords:Guerrero seismic gap; slow slip event (SSE); Papanoa; afterslip; independent component analysis (ICA)
Issue or Number:12
Record Number:CaltechAUTHORS:20170803-074114168
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20170803-074114168
Official Citation:Gualandi, A., H. Perfettini, M. Radiguet, N. Cotte, and V. Kostoglodov (2017), GPS deformation related to the Mw 7.3, 2014, Papanoa earthquake (Mexico) reveals the aseismic behavior of the Guerrero seismic gap, Geophys. Res. Lett., 44, 6039–6047, doi:10.1002/2017GL072913
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:79810
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:05 Aug 2017 21:01
Last Modified:03 Oct 2019 18:24

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