Seismicity and state of stress in the central and southern Peruvian flat slab

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dc.contributor.authorKumar, Abhash
dc.contributor.authorWagner, Lara S.
dc.contributor.authorBeck, Susan L.
dc.contributor.authorLong, Maureen D.
dc.contributor.authorZandt, George
dc.contributor.authorYoung, Bissett
dc.contributor.authorTavera, Hernando
dc.contributor.authorMinaya, Estella
dc.coverage.spatialPerú
dc.date.accessioned2018-08-08T15:48:49Z
dc.date.available2018-08-08T15:48:49Z
dc.date.issued2016-05
dc.description.abstractWe have determined the Wadati–Benioff Zone seismicity and state of stress of the subducting Nazca slab beneath central and southern Peru using data from three recently deployed local seismic networks. Our relocated hypocenters are consistent with a flat slab geometry that is shallowest near the Nazca Ridge, and changes from steep to normal without tearing to the south. These locations also indicate numerous abrupt along-strike changes in seismicity, most notably an absence of seismicity along the projected location of subducting Nazca Ridge. This stands in stark contrast to the very high seismicity observed along the Juan Fernandez ridge beneath central Chile where, a similar flat slab geometry is observed. We interpret this as indicative of an absence of water in the mantle beneath the overthickened crust of the Nazca Ridge. This may provide important new constraints on the conditions required to produce intermediate depth seismicity. Our focal mechanisms and stress tensor inversions indicate dominantly down-dip extension, consistent with slab pull, with minor variations that are likely due to the variable slab geometry and stress from adjacent regions. We observe significantly greater variability in the P-axis orientations and maximum compressive stress directions. The along strike change in the orientation of maximum compressive stress is likely related to slab bending and unbending south of the Nazca Ridge.es_ES
dc.description.peer-reviewPor pareses_ES
dc.formatapplication/pdfes_ES
dc.identifier.citationKumar, A., Wagner, L. S., Beck, S. L., Long, M. D., Zandt, G., Young, B., ... Minaya, E. (2016). Seismicity and state of stress in the central and southern Peruvian flat slab.==$Earth and Planetary Science Letters, 441,$==71-80. https://doi.org/10.1016/j.epsl.2016.02.023es_ES
dc.identifier.doihttps://doi.org/10.1016/j.epsl.2016.02.023es_ES
dc.identifier.govdocindex-oti2018
dc.identifier.journalEarth and Planetary Science Letterses_ES
dc.identifier.urihttp://hdl.handle.net/20.500.12816/2316
dc.language.isoenges_ES
dc.publisherElsevieres_ES
dc.relation.ispartofurn:issn:0012-821X
dc.rightsinfo:eu-repo/semantics/closedAccesses_ES
dc.subjectNazca platees_ES
dc.subjectRidge buoyancyes_ES
dc.subjectSubduction geometryes_ES
dc.subjectFlat slabes_ES
dc.subject.ocdehttp://purl.org/pe-repo/ocde/ford#1.05.00es_ES
dc.subject.ocdehttp://purl.org/pe-repo/ocde/ford#1.05.04es_ES
dc.subject.ocdehttp://purl.org/pe-repo/ocde/ford#1.05.06es_ES
dc.titleSeismicity and state of stress in the central and southern Peruvian flat slabes_ES
dc.typeinfo:eu-repo/semantics/articlees_ES

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