Show simple item record

dc.creatorSyracuse, Ellen M. 
dc.creatorMaceira, Monica 
dc.creatorPrieto, Germán A. 
dc.creatorZhang, Haijiang 
dc.creatorAmmon, Charles J.
dc.identifier.issnISSN: 0012-821X
dc.identifier.issnEISSN: 1385-013X
dc.description.abstractSubduction beneath the northernmost Andes in Colombia is complex. Based on seismicity distributions, multiple segments of slab appear to be subducting, and arc volcanism ceases north of 5° N. Here, we illuminate the subduction system through hypocentral relocations and Vp and Vs models resulting from the joint inversion of local body wave arrivals, surface wave dispersion measurements, and gravity data. The simultaneous use of multiple data types takes advantage of the differing sensitivities of each data type, resulting in velocity models that have improved resolution at both shallower and deeper depths than would result from traditional travel time tomography alone. The relocated earthquake dataset and velocity model clearly indicate a tear in the Nazca slab at 5° N, corresponding to a 250-km shift in slab seismicity and the termination of arc volcanism. North of this tear, the slab is flat, and it comprises slabs of two sources: the Nazca and Caribbean plates. The Bucaramanga nest, a small region of among the most intense intermediate-depth seismicity globally, is associated with the boundary between these two plates and possibly with a zone of melting or elevated water content, based on reduced Vp and increased Vp/Vs. We also use relocated seismicity to identify two new faults in the South American plate, one related to plate convergence and one highlighted by induced seismicity.
dc.relation.ispartofEarth and Planetary Science Letters, ISSN: 0012-821X;EISSN: 1385-013X Vol.444, No.15 (June 2016); pp.139-149
dc.sourceEarth and Planetary Science Letters
dc.titleMultiple plates subducting beneath Colombia, as illuminated by seismicity and velocity from the joint inversion of seismic and gravity data
dc.subject.keywordBucaramanga nest
dc.subject.keywordSlab tear
dc.subject.keywordBody wave
dc.subject.keywordSurface wave
dc.rights.accesoRestringido (Acceso a grupos específicos)
dc.title.TranslatedTitleMúltiples placas que se subducen debajo de Colombia, iluminadas por la sismicidad y la velocidad de la inversión conjunta de datos sísmicos y de gravedad.
dc.relation.citationIssueNo. 15
dc.relation.citationTitleEarth and Planetary Science Letters
dc.relation.citationVolumeVol. 444

Files in this item


There are no files associated with this item.

This item appears in the following Collection(s)

Show simple item record