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http://hdl.handle.net/10261/158597
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dc.contributor.author | Silva, Sonia | - |
dc.contributor.author | Terrinha, Pedro | - |
dc.contributor.author | Matias, L. | - |
dc.contributor.author | Duarte, João C. | - |
dc.contributor.author | Roque, Cristina | - |
dc.contributor.author | Ranero, César R. | - |
dc.contributor.author | Geissler, W.H. | - |
dc.contributor.author | Zitellini, Nevio | - |
dc.date.accessioned | 2017-12-27T13:11:50Z | - |
dc.date.available | 2017-12-27T13:11:50Z | - |
dc.date.issued | 2017-10 | - |
dc.identifier | doi: 10.1016/j.tecto.2017.07.026 | - |
dc.identifier | issn: 0040-1951 | - |
dc.identifier | e-issn: 1879-3266 | - |
dc.identifier.citation | Tectonophysics 717: 226-241 (2017) | - |
dc.identifier.uri | http://hdl.handle.net/10261/158597 | - |
dc.description | 16 pages, 13 figures, 1 table, supplementary data https://doi.org/10.1016/j.tecto.2017.07.026 | - |
dc.description.abstract | The Gulf of Cadiz seismicity is characterized by persistent low to intermediate magnitude earthquakes, occasionally punctuated by high magnitude events such as the M ~ 8.7 1755 Great Lisbon earthquake and the M = 7.9 event of February 28th, 1969. Micro-seismicity was recorded during 11 months by a temporary network of 25 ocean bottom seismometers (OBSs) in an area of high seismic activity, encompassing the potential source areas of the mentioned large magnitude earthquakes. We combined micro-seismicity analysis with processing and interpretation of deep crustal seismic reflection profiles and available refraction data to investigate the possible tectonic control of the seismicity in the Gulf of Cadiz area. Three controlling mechanisms are explored: i) active tectonic structures, ii) transitions between different lithospheric domains and inherited Mesozoic structures, and iii) fault weakening mechanisms. Our results show that micro-seismicity is mostly located in the upper mantle and is associated with tectonic inversion of extensional rift structures and to the transition between different lithospheric/rheological domains. Even though the crustal structure is well imaged in the seismic profiles and in the bathymetry, crustal faults show low to negligible seismic activity. A possible explanation for this is that the crustal thrusts are thin-skinned structures rooting in relatively shallow sub-horizontal décollements associated with (aseismic) serpentinization levels at the top of the lithospheric mantle. Therefore, co-seismic slip along crustal thrusts may only occur during large magnitude events, while for most of the inter-seismic cycle these thrusts remain locked, or slip aseismically. We further speculate that high magnitude earthquake's ruptures may only nucleate in the lithospheric mantle and then propagate into the crust across the serpentinized layers | - |
dc.description.sponsorship | The NEAREST project was funded by the financial EU Specific Programme “Integrating and Strengthening the European Research Area”, Sub-Priority 1.1.6.3, “Global Change and Ecosystems”, contract n. 037110. [...] We acknowledge the support by Landmark Graphics Corporation (no. 2012-UGP-008121) via the Landmark University Grant program. [...] This publication is supported by the project FCT UID/GEO/50019/2013 - Instituto Dom Luiz. S. Silva acknowledges a Ph.D. scholarship (SFRH/BD/46227/2008) from the Fundação para a Ciência e Tecnologia (FCT) and a science and technology management grant from EMODNET (European Marine Observation and Data NETwork) - geology project; and the MINEPLAT project (ALT20030145FEDER000013). J. Duarte acknowledges the financial support from the Australian Research Council through DECRA (Discovery Early Career Researcher Award) Grant DE150100326, and the financial support from the FCT through an Investigator Starting Grant and an associated Exploratory Research Project (Ref. IF/00702/2015) | - |
dc.publisher | Elsevier | - |
dc.rights | closedAccess | - |
dc.subject | Serpentinization | - |
dc.subject | High-magnitude earthquakes | - |
dc.subject | Aseismic slip | - |
dc.subject | Neotectonics | - |
dc.subject | Nubia-Eurasia plate boundary | - |
dc.subject | Micro-seismicity | - |
dc.title | Micro-seismicity in the Gulf of Cadiz: Is there a link between micro-seismicity, high magnitude earthquakes and active faults? | - |
dc.type | artículo | - |
dc.identifier.doi | 10.1016/j.tecto.2017.07.026 | - |
dc.relation.publisherversion | https://doi.org/10.1016/j.tecto.2017.07.026 | - |
dc.date.updated | 2017-12-27T13:11:52Z | - |
dc.description.version | Peer Reviewed | - |
dc.language.rfc3066 | eng | - |
dc.contributor.funder | Australian Research Council | - |
dc.contributor.funder | Fundação para a Ciência e a Tecnologia (Portugal) | - |
dc.contributor.funder | European Commission | - |
dc.contributor.funder | Halliburton Landmark | - |
dc.relation.csic | Sí | - |
dc.identifier.funder | http://dx.doi.org/10.13039/501100000923 | es_ES |
dc.identifier.funder | http://dx.doi.org/10.13039/501100001871 | es_ES |
dc.identifier.funder | http://dx.doi.org/10.13039/501100000780 | es_ES |
dc.type.coar | http://purl.org/coar/resource_type/c_6501 | es_ES |
item.openairetype | artículo | - |
item.grantfulltext | none | - |
item.cerifentitytype | Publications | - |
item.openairecristype | http://purl.org/coar/resource_type/c_18cf | - |
item.fulltext | No Fulltext | - |
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