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Spatiotemporal distribution of the seismicity along the Mid-Atlantic Ridge north of the Azores from hydroacoustic data: Insights into seismogenic processes in a ridge-hot spot context

2012-02Journal article Open access
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dc.contributor.authorGoslin, J.
dc.contributor.authorPerrot, J.
dc.contributor.authorRoyer, J. -Y.
dc.contributor.authorMartin, C.
dc.contributor.authorLourenco, N.
dc.contributor.authorLuis, J.
dc.contributor.authorDziak, R. P.
dc.contributor.authorMatsumoto, H.
dc.contributor.authorHaxel, J.
dc.contributor.authorFowler, M. J.
dc.contributor.authorFox, C. G.
dc.contributor.authorLau, A. T. -K.
dc.contributor.authorBazin, S.
dc.date.accessioned2018-12-07T14:53:03Z
dc.date.available2018-12-07T14:53:03Z
dc.date.issued2012-02
dc.description.abstractThe seismicity of the North Atlantic was monitored from May 2002 to September 2003 by the 'SIRENA array' of autonomous hydrophones. The hydroacoustic signals provide a unique data set documenting numerous low-magnitude earthquakes along the section of the Mid-Atlantic Ridge (MAR) located in a ridge-hot spot interaction context. During the experiment, 1696 events were detected along the MAR axis between 40 degrees N and 51 degrees N, with a magnitude of completeness level of m(b) approximate to 2.4. Inside the array, location errors are in the order of 2 km, and errors in the origin time are less than 1 s. From this catalog, 15 clusters were detected. The distribution of source level (SL) versus time within each cluster is used to discriminate clusters occurring in a tectonic context from those attributed to non-tectonic (i.e. volcanic or hydrothermal) processes. The location of tectonic and non-tectonic sequences correlates well with regions with positive and negative Mantle Bouguer Anomalies (MBAs), indicating the presence of thinner/colder and thicker/warmer crust respectively. At the scale of the entire array, both the complete and declustered catalogs derived from the hydroacoustic signals show an increase of the seismicity rate from the Azores up to 43 degrees 30'N suggesting a diminishing influence of the Azores hot spot on the ridge-axis temperature, and well correlated with a similar increase in the along-axis MBAs. The comparison of the MAR seismicity with the Residual MBA (RMBA) at different scales leads us to think that the low-magnitude seismicity rates are directly related to along-axis variations in lithosphere rheology and temperatures.
dc.description.versioninfo:eu-repo/semantics/publishedVersion
dc.identifier.doi10.1029/2011GC003828
dc.identifier.issn1525-2027
dc.identifier.urihttp://hdl.handle.net/10400.1/11327
dc.language.isoeng
dc.peerreviewedyes
dc.publisherAmerican Geophysical Union
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/
dc.subjectHydrophone arrays
dc.subjectReykjanes ridge
dc.subjectMidocean ridges
dc.subjectOmori formula
dc.subjectSea-floor
dc.subjectT-waves
dc.subjectGravity
dc.subjectEarthquakes
dc.subjectEvolution
dc.subjectSegmentation
dc.titleSpatiotemporal distribution of the seismicity along the Mid-Atlantic Ridge north of the Azores from hydroacoustic data: Insights into seismogenic processes in a ridge-hot spot context
dc.typejournal article
dspace.entity.typePublication
oaire.citation.startPageQ02010
oaire.citation.titleGeochemistry, Geophysics, Geosystems
oaire.citation.volume13
person.familyNameLuis
person.givenNameJoaquim
person.identifier.ciencia-id0D11-8EF9-2E68
person.identifier.orcid0000-0002-9035-4069
person.identifier.ridA-1112-2009
person.identifier.scopus-author-id7006391353
rcaap.rightsopenAccess
rcaap.typearticle
relation.isAuthorOfPublication636a16a1-f50a-49d2-9d5c-dbc3444815bd
relation.isAuthorOfPublication.latestForDiscovery636a16a1-f50a-49d2-9d5c-dbc3444815bd

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