Influence of Incoming Plate Relief on Overriding Plate Deformation and Earthquake Nucleation: Cocos Ridge Subduction (Costa Rica)

Influence of Incoming Plate Relief on Overriding Plate Deformation and Earthquake Nucleation: Cocos Ridge Subduction (Costa Rica)

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18 pages, 7 figures, supporting information https://doi.org/10.1029/2019TC005586.-- Data are available at the PANGAEA world data center https://doi.org/10.1594/PANGAEA.909047

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Main Authors: Martínez-Loriente, S., Sallarès, Valentí, Ranero, César R., Ruh, Jonas Bruno, Barckhausen, Udo, Grevemeyer, Ingo, Bangs, Nathan L.
Other Authors: Ministerio de Economía y Competitividad (España)
Format: artículo biblioteca
Language:English
Published: American Geophysical Union 2019-12
Online Access:http://hdl.handle.net/10261/199535
http://dx.doi.org/10.13039/501100003329
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spelling dig-icm-es-10261-1995352024-05-15T10:00:25Z Influence of Incoming Plate Relief on Overriding Plate Deformation and Earthquake Nucleation: Cocos Ridge Subduction (Costa Rica) Martínez-Loriente, S. Sallarès, Valentí Ranero, César R. Ruh, Jonas Bruno Barckhausen, Udo Grevemeyer, Ingo Bangs, Nathan L. Ministerio de Economía y Competitividad (España) 18 pages, 7 figures, supporting information https://doi.org/10.1029/2019TC005586.-- Data are available at the PANGAEA world data center https://doi.org/10.1594/PANGAEA.909047 We present a 2‐D P wave velocity model and a coincident multichannel seismic reflection profile characterizing the structure of the southern Costa Rica margin and incoming Cocos Ridge. The seismic profiles image the ocean and overriding plates from the trench across the entire offshore margin, including the structures involved in the 2002 Osa earthquake. The overriding plate consists of three domains: Domain I displays thin‐skinned deformation of an imbricate thrust system composed of fractured rocks. Domain II shows ~15‐km‐long landward dipping reflection packages and active deformation of the shelf sediment. Domain III is little fractured and appears to be dominated by elastic deformation, overlain by ~2‐km‐thick landward dipping strata. The velocity structure supports the argument that the bulk of the margin is highly consolidated rock. Thick‐skinned tectonics probably causes the uplift of Domains II and III. The oceanic plate shows crustal thickness variations from ~14 km at the trench (Cocos Ridge) to 6–7 km beneath the shelf. We combine (1) interplate geometry and fracturing degree, (2) tectonic stresses and brittle strain, and (3) earthquake locations, to investigate relationships between structure and earthquake generation. The 2002 Osa sequence nucleated at the leading flank of subducting seamounts in the area of highest tectonic overpressure. Both estimated rock fracturing and modeled brittle strain steadily increase from the leading flank of the subducting seamounts to their top, reflecting the progressive damage caused by the seamount. Therefore, the seismicity and structural‐mechanical evolution of the upper plate reflect the downward propagation of the leading edge of seamounts This research was supported by E‐FIRE (PCIN‐2015‐053) and FRAME (CTM2015‐71766‐R) projects, as well as the People Programme (Marie Curie Actions) under REA Grant Agreement 604713 (ZIP “Zooming In between Plates”) Peer reviewed 2020-02-03T14:01:41Z 2020-02-03T14:01:41Z 2019-12 artículo http://purl.org/coar/resource_type/c_6501 Tectonics 38(12): 4360-4377 (2019) 0278-7407 http://hdl.handle.net/10261/199535 10.1029/2019TC005586 1944-9194 http://dx.doi.org/10.13039/501100003329 en #PLACEHOLDER_PARENT_METADATA_VALUE# info:eu-repo/grantAgreement/MINECO/Plan Estatal de Investigación Científica y Técnica y de Innovación 2013-2016/CTM2015-71766-R Publisher's version https://doi.org/10.1029/2019TC005586 Sí open American Geophysical Union
institution ICM ES
collection DSpace
country España
countrycode ES
component Bibliográfico
access En linea
databasecode dig-icm-es
tag biblioteca
region Europa del Sur
libraryname Biblioteca del ICM España
language English
description 18 pages, 7 figures, supporting information https://doi.org/10.1029/2019TC005586.-- Data are available at the PANGAEA world data center https://doi.org/10.1594/PANGAEA.909047
author2 Ministerio de Economía y Competitividad (España)
author_facet Ministerio de Economía y Competitividad (España)
Martínez-Loriente, S.
Sallarès, Valentí
Ranero, César R.
Ruh, Jonas Bruno
Barckhausen, Udo
Grevemeyer, Ingo
Bangs, Nathan L.
format artículo
author Martínez-Loriente, S.
Sallarès, Valentí
Ranero, César R.
Ruh, Jonas Bruno
Barckhausen, Udo
Grevemeyer, Ingo
Bangs, Nathan L.
spellingShingle Martínez-Loriente, S.
Sallarès, Valentí
Ranero, César R.
Ruh, Jonas Bruno
Barckhausen, Udo
Grevemeyer, Ingo
Bangs, Nathan L.
Influence of Incoming Plate Relief on Overriding Plate Deformation and Earthquake Nucleation: Cocos Ridge Subduction (Costa Rica)
author_sort Martínez-Loriente, S.
title Influence of Incoming Plate Relief on Overriding Plate Deformation and Earthquake Nucleation: Cocos Ridge Subduction (Costa Rica)
title_short Influence of Incoming Plate Relief on Overriding Plate Deformation and Earthquake Nucleation: Cocos Ridge Subduction (Costa Rica)
title_full Influence of Incoming Plate Relief on Overriding Plate Deformation and Earthquake Nucleation: Cocos Ridge Subduction (Costa Rica)
title_fullStr Influence of Incoming Plate Relief on Overriding Plate Deformation and Earthquake Nucleation: Cocos Ridge Subduction (Costa Rica)
title_full_unstemmed Influence of Incoming Plate Relief on Overriding Plate Deformation and Earthquake Nucleation: Cocos Ridge Subduction (Costa Rica)
title_sort influence of incoming plate relief on overriding plate deformation and earthquake nucleation: cocos ridge subduction (costa rica)
publisher American Geophysical Union
publishDate 2019-12
url http://hdl.handle.net/10261/199535
http://dx.doi.org/10.13039/501100003329
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