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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American Geophysical Union (AGU) Fall Meeting, 9-13 December 2019, San Francisco

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Main Authors: Martínez-Loriente, S., Sallarès, Valentí, Ranero, César R., Ruh, Jonas Bruno, Barckhausen, Udo, Grevemeyer, Ingo, Bangs, Nathan L., Gràcia, Eulàlia
Format: comunicación de congreso biblioteca
Published: American Geophysical Union 2019-12-13
Online Access:http://hdl.handle.net/10261/207449
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spelling dig-icm-es-10261-2074492024-05-15T10:02:44Z 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. Gràcia, Eulàlia American Geophysical Union (AGU) Fall Meeting, 9-13 December 2019, San Francisco We present a 2D p-wave velocity (Vp) model and a coincident multichannel seismic reflection profile mapping the structure of the southern Costa Rica margin and incoming Cocos Ridge. The seismic profiles image the ocean plate from near the trench axis to ~50 km after under-thrusting and the overriding plate to near the coastline across the entire margin, including the structures involved in the 2002 Mw6.4 Osa earthquake. The overriding plate consists of three domains: Domain I at the margin front displays thin-skinned deformation of an imbricated-thrust system made of fractured rocks with relatively low Vp. Domain II under the middle continental shelf is comparatively less fractured, showing ~15 km long landward-dipping reflection packages and discrete active deformation of the shelf sediment and seafloor. Domain III in the inner shelf appears to be dominated by elastic deformation, with inactive structures of an extensional basin consisting of tilted blocks overlain by ~2 km-thick gently landward-dipping strata. The data support that the bulk of the margin is highly consolidated rock possibly similar to outcrops in the Osa Peninsula. Thick-skinned tectonics probably causes the uplift of Domains II and III. The incoming oceanic plate shows crustal thickness variations from ~14 km at the trench (Cocos Ridge) to 6-7 km beneath the continental shelf. We combine (1) inter-plate geometry and velocity-derived fracturing degree at the base of the overriding plate, (2) tectonic stresses and brittle strain above the inter-plate boundary extracted from 3D numerical models, and (3) earthquake locations, to investigate potential relationships between structure and earthquake generation. The 2002 Osa earthquake and its aftershocks appear to have nucleated at the leading flank of two subducting seamounts, coinciding with the area of highest tectonic overpressure in numerical models. Both, estimated rock fracturing and modelled brittle strain, steadily increase from the leading flank of the subducting seamounts to their top, which we interpret to reflect the progressive damage caused by the incoming plate relief. Therefore, the analysis supports a spatial and temporal relationship between subducting seamount location, upper plate fracturing, brittle strain, tectonic overpressure, and earthquake nucleation 2020-04-14T09:19:29Z 2020-04-14T09:19:29Z 2019-12-13 2020-04-14T09:19:29Z comunicación de congreso http://purl.org/coar/resource_type/c_5794 2019 AGU Fall Meeting (2019) http://hdl.handle.net/10261/207449 https://agu.confex.com/agu/fm19/meetingapp.cgi/Paper/492269 Sí none 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
description American Geophysical Union (AGU) Fall Meeting, 9-13 December 2019, San Francisco
format comunicación de congreso
author Martínez-Loriente, S.
Sallarès, Valentí
Ranero, César R.
Ruh, Jonas Bruno
Barckhausen, Udo
Grevemeyer, Ingo
Bangs, Nathan L.
Gràcia, Eulàlia
spellingShingle Martínez-Loriente, S.
Sallarès, Valentí
Ranero, César R.
Ruh, Jonas Bruno
Barckhausen, Udo
Grevemeyer, Ingo
Bangs, Nathan L.
Gràcia, Eulàlia
Influence of Incoming Plate Relief on Overriding Plate Deformation and Earthquake Nucleation: Cocos Ridge Subduction (Costa Rica)
author_facet Martínez-Loriente, S.
Sallarès, Valentí
Ranero, César R.
Ruh, Jonas Bruno
Barckhausen, Udo
Grevemeyer, Ingo
Bangs, Nathan L.
Gràcia, Eulàlia
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 2019-12-13
url http://hdl.handle.net/10261/207449
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