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Mostrando ítems 71-80 de 2002
Electrical conductivity of the Pampean Shallow Subduction Region of Argentina near 33 S: evidence for a slab window
(American Geophysical Union, 2013-08)
We present a three-dimensional (3-D) interpretation of 117 long period (20–4096 s) magnetotelluric (MT) sites between 31°S and 35°S in western Argentina. They cover the most horizontal part of the Pampean shallow angle ...
A recent deep earthquake doublet in light of long-term evolution of Nazca subduction
(Nature Research, 2017-03-31)
Earthquake faulting at ~600 km depth remains puzzling. Here we present a new kinematic interpretation of two Mw7.6 earthquakes of November 24, 2015. In contrast to teleseismic analysis of this doublet, we use regional ...
Variable seismic anisotropy across the Peruvian flat-slab subduction zone with implications for upper plate deformation
(Elsevier, 2021-03)
We performed shear wave splitting analyses to investigate seismic anisotropy across the northern extent of the Peruvian flat-slab subduction region. We used core-mantle refracted SKS, SKKS and PKS phases from teleseismic ...
Seismic-gravimetric analysis of the subducted Nazca plate 1 between 32°S and 36°S
(Science Press, 2018-01)
The study region is seismically and tectonically characterized by the angle variations in the subduction of the Nazca plate. The results obtained from earthquakes location between 32° and 36°S latitude and 67°–71°W longitude ...
Seismic ridge subduction and topography: Foreland deformation in the Patagonian Andes
(Elsevier Science, 2005-04)
The Patagonian Andes recorded several episodes of active ridge subduction in the last 80 million years. An analysis of the spatial and temporal relation between the present segment of collision of the Chile ridge and the ...
Neogene retroarc foreland basin evolution, sediment provenance, and magmatism in response to flat slab subduction, western Argentina
(American Geophysical Union, 2020-05)
Understanding the effects of flat slab subduction on mountain building, arc magmatism, and basin evolution is fundamental to convergent-margin tectonics, with implications for potential feedbacks among geodynamic, magmatic, ...
Temporal variations in the influence of the subducting slab on Central Andean arc magmas: Evidence from boron isotope systematics
(Elsevier Science, 2014-12)
The Pampean flat-slab segment in the southern Central Andes represents an ideal setting at which to investigate how changes in the tectonic configuration of a subduction zone (convergence angles and rates, seamount subduction ...
Detailed Structure of the Subducted Nazca Slab into the Lower Mantle Derived From Continent-Scale Teleseismic P Wave Tomography
(Blackwell Publishing, 2020-05)
Nazca subduction beneath South America is one of our best modern examples of long-lived ocean-continent subduction on the planet, serving as a foundation for our understanding of subduction processes. Within that framework, ...
Forearc deformation along the peruvian margin and the effects of changes in subduction style: quantifying the rates of Quaternary deformation using in situ produced cosmogenic 10Be and 26Al.
(Sociedad Geológica del PerúPE, 2004)
The Andes are one ofthe world's two highest mountain ranges and together wíth the westem cordillera of
North America they forro an almost a continuous mountaín chain from the tip of Patagonia to the Alaskan peninsula. ...
An 8month slow slip event triggers progressive nucleation of the 2014 Chile megathrust
(American Geophysical Union, 2017-05-16)
The mechanisms leading to large earthquakes are poorly understood and documented. Here we characterize the long-term precursory phase of the 1 April 2014 M(w)8.1 North Chile megathrust. We show that a group of coastal GPS ...