Mostrar el registro sencillo del ítem Scire, Alissa Zandt, George Beck, Susan Long, Maureen Wagner, Lara Minaya, Estela Tavera, Hernando 2018-08-08T14:04:55Z 2018-08-08T14:04:55Z 2016-01
dc.identifier.govdoc index-oti2018
dc.identifier.issn 1365246X
dc.description En: Geophysical Journal International, v. 204, n. 1, (January 2016), p. 457–479. es_ES
dc.description.abstract "Two arrays of broad-band seismic stations were deployed in the north central Andes between 8° and 21°S, the CAUGHT array over the normally subducting slab in northwestern Bolivia and southern Peru, and the PULSE array over the southern part of the Peruvian flat slab where the Nazca Ridge is subducting under South America. We apply finite frequency teleseismic P- and S-wave tomography to data from these arrays to investigate the subducting Nazca plate and the surrounding mantle in this region where the subduction angle changes from flat north of 14°S to normally dipping in the south. We present new constraints on the location and geometry of the Nazca slab under southern Peru and northwestern Bolivia from 95 to 660 km depth. Our tomographic images show that the Peruvian flat slab extends further inland than previously proposed along the projection of the Nazca Ridge. Once the slab re-steepens inboard of the flat slab region, the Nazca slab dips very steeply (∼70°) from about 150 km depth to 410 km depth. Below this the slab thickens and deforms in the mantle transition zone. We tentatively propose a ridge-parallel slab tear along the north edge of the Nazca Ridge between 130 and 350 km depth based on the offset between the slab anomaly north of the ridge and the location of the re-steepened Nazca slab inboard of the flat slab region, although additional work is needed to confirm the existence of this feature. The subslab mantle directly below the inboard projection of the Nazca Ridge is characterized by a prominent low-velocity anomaly. South of the Peruvian flat slab, fast anomalies are imaged in an area confined to the Eastern Cordillera and bounded to the east by well-resolved low-velocity anomalies. These low-velocity anomalies at depths greater than 100 km suggest that thick mantle lithosphere associated with underthrusting of cratonic crust from the east is not present. In northwestern Bolivia a vertically elongated fast anomaly under the Subandean Zone is interpreted as a block of delaminating lithosphere." es_ES
dc.format application/pdf es_ES
dc.language.iso eng es_ES
dc.publisher Oxford University Press es_ES
dc.rights info:eu-repo/semantics/openAccess es_ES
dc.rights.uri es_ES
dc.source Repositorio institucional - IGP es_ES
dc.subject Tomografía es_ES
dc.subject Tomografía sísmica es_ES
dc.subject Zonas de subducción es_ES
dc.subject Litosfera es_ES
dc.subject Sismología--América del Sur es_ES
dc.subject Tierra (Planeta)--Estructura interna es_ES
dc.subject Placas tectónicas es_ES
dc.subject Andes--Geología es_ES
dc.title Imaging the transition from flat to normal subduction: variations in the structure of the Nazca slab and upper mantle under southern Peru and northwestern Bolivia es_ES
dc.type info:eu-repo/semantics/article es_ES
dc.subject.ocde Sismología es_ES
dc.subject.ocde Perú es_ES
dc.subject.ocde Región andina es_ES
dc.subject.ocde Bolivia es_ES
dc.subject.ocde América del Sur es_ES
dc.subject.ocde Geofísica es_ES
dc.identifier.journal Geophysical Journal International es_ES
dc.description.peer-review Por pares es_ES
dc.identifier.doi 10.1093/gji/ggv452 es_ES




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