Seismic Subduction of the Nazca Ridge as Shown by the 1996–97 Peru Earthquakes

1999 ◽  
pp. 753-776 ◽  
Author(s):  
William Spence ◽  
C. Mendoza ◽  
E. R. Engdahl ◽  
G. L. Choy ◽  
Edmundo Norabuena
Keyword(s):  
Nazca Ridge

Subduction of the Nazca Ridge and the Inca Plateau: Insights into the formation of ore deposits in Peru

2005 ◽  
Vol 239 (1-2) ◽  
pp. 18-32 ◽  
Author(s):  
Gideon Rosenbaum ◽  
David Giles ◽  
Mark Saxon ◽  
Peter G. Betts ◽  
Roberto F. Weinberg ◽  
...  
Keyword(s):  
Ore Deposits ◽  
Nazca Ridge

scholarly journals Seismic Velocity Structure in the Area of the 2007, Mw 8.0, Pisco-Peru Earthquake: Implications for the Mechanics of Subduction in the Vicinity of the Nazca Ridge

2020 ◽  
Vol 2020 ◽  
pp. 1-8
Author(s):  
I. Bernal ◽  
H. Tavera
Keyword(s):  
Velocity Structure ◽  
Seismic Velocity ◽  
Velocity Model ◽  
Double Difference ◽  
Seismic Velocity Structure ◽  
Uplift Rates ◽  
Northern Edge ◽  
Nazca Ridge ◽  
Geomorphological Features ◽  
Postseismic Slip

In this study, we present a velocity model for the area of the 2007 Pisco-Peru earthquake ( Mw = 8.0 ) obtained using a double-difference tomography algorithm that considers aftershocks acquired for 6 months. The studied area is particularly interesting because it lies on the northern edge of the Nazca Ridge, in which the subduction of a large bathymetric structure is the origin of geomorphological features of the central coast of Peru. Relocated seismicity is used to infer the geometry of the subduction slab on the northern flank of the Nazca Ridge. The results prove that the geometry is continuous but convex because of the subduction of the ridge, thereby explaining the high uplift rates observed in this area. Our inferred distribution of seismicity agrees with both the coseismic and postseismic slip distributions.

scholarly journals Structure of the Collision Zone Between the Nazca Ridge and the Peruvian Convergent Margin: Geodynamic and Seismotectonic Implications

Tectonics ◽  
2019 ◽  
Vol 38 (9) ◽  
pp. 3416-3435 ◽  
Author(s):  
E. Contreras‐Reyes ◽  
P. Muñoz‐Linford ◽  
V. Cortés‐Rivas ◽  
J. P. Bello‐González ◽  
J. A. Ruiz ◽  
...  
Keyword(s):  
Convergent Margin ◽  
Collision Zone ◽  
Nazca Ridge

scholarly journals Geomorphic evidence for recent uplift of the Fitzcarrald Arch (Peru): A response to the Nazca Ridge subduction

Geomorphology ◽  
2009 ◽  
Vol 107 (3-4) ◽  
pp. 107-117 ◽  
Author(s):  
V. Regard ◽  
R. Lagnous ◽  
N. Espurt ◽  
J. Darrozes ◽  
P. Baby ◽  
...  
Keyword(s):  
Ridge Subduction ◽  
Nazca Ridge

scholarly journals The Nazca Drift System – palaeoceanographic significance of a giant sleeping on the SE Pacific Ocean floor

2021 ◽  
pp. 1-15
Author(s):  
Gérôme Calvès ◽  
Alan Mix ◽  
Liviu Giosan ◽  
Peter D. Clift ◽  
Stéphane Brusset ◽  
...  
Keyword(s):  
Pacific Ocean ◽  
Deep Water ◽  
Bottom Current ◽  
Ocean Drilling Program ◽  
Nazca Plate ◽  
Ocean Drilling ◽  
The Pacific ◽  
The Pacific Ocean ◽  
Nazca Ridge ◽  
Sea Currents

Abstract The evolution and resulting morphology of a contourite drift system in the SE Pacific oceanic basin is investigated in detail using seismic imaging and an age-calibrated borehole section. The Nazca Drift System covers an area of 204 500 km2 and stands above the abyssal basins of Peru and Chile. The drift is spread along the Nazca Ridge in water depths between 2090 and 5330 m. The Nazca Drift System was drilled at Ocean Drilling Program Site 1237. This deep-water drift overlies faulted oceanic crust and onlaps associated volcanic highs. Its thickness ranges from 104 to 375 m. The seismic sheet facies observed are associated with bottom current processes. The main lithologies are pelagic carbonates reflecting the distal position relative to South America and water depth above the carbonate compensation depth during Oligocene time. The Nazca Drift System developed under the influence of bottom currents sourced from the Circumpolar Deep Water and Pacific Central Water, and is the largest yet identified abyssal drift system of the Pacific Ocean, ranking third in all abyssal contourite drift systems globally. Subduction since late Miocene time and the excess of sediments and water associated with the Nazca Drift System may have contributed to the Andean orogeny and associated metallogenesis. The Nazca Drift System records the evolution in interactions between deep-sea currents and the eastward motion of the Nazca Plate through erosive surfaces and sediment remobilization.

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