scholarly journals P Wave Azimuthal Anisotropic Tomography in Northern Chile: Insight Into Deformation in the Subduction Zone

2019 ◽  
Vol 124 (1) ◽  
pp. 742-765 ◽  
Author(s):  
Zhouchuan Huang ◽  
Frederik Tilmann ◽  
Diana Comte ◽  
Dapeng Zhao
Keyword(s):  
Subduction Zone ◽  
P Wave ◽  
Northern Chile ◽  
Insight Into

Trench-parallel compressive upper plate stress field in the northern Chile forearc from earthquake source mechanisms

2020 ◽  
Author(s):  
Bernd Schurr ◽  
Lukas Lehmann ◽  
Christian Sippl ◽  
Wasja Bloch
Keyword(s):  
Stress Field ◽  
Subduction Zone ◽  
Elastic Response ◽  
Lower Plate ◽  
Northern Chile ◽  
Stress Regime ◽  
Plate Convergence ◽  
Source Mechanisms ◽  
Plate Coupling ◽  
East West

<p>Subduction zone forearcs deform transiently and permanently due to the frictional coupling with the converging lower plate. Transient stresses are mostly the elastic response to the spatio-temporally variable plate coupling through the seismic cycle. Long-term deformation depends e.g., on the plate convergence geometry, where obliqueness or change in obliqueness play important roles. Here we use the Integrated Plate Boundary Observatory Chile (IPOC) and additional temporal networks to determine source mechanisms for upper plate earthquakes in the northern Chile subduction zone. We find that earthquakes in the South American crust under the sea and under the Coastal Cordillera show a remarkably homogenous north-south, i.e. trench-parallel, compressional stress field. Earthquake fault mechanisms are dominated by east-west striking thrusts. Further inland, where the lower plate becomes uncoupled, the stress field is more varied with direction east-west to southeast-northwest (approx. convergence parallel) dominating. The peculiar stress-regime above the plate-coupling-zone almost perpendicular to plate convergence direction may be explained by a change in subduction obliqueness due to the concave shape of the plate margin.</p>

scholarly journals Three-dimensional elastic wave speeds in the northern Chile subduction zone: variations in hydration in the supraslab mantle

2016 ◽  
Vol 207 (2) ◽  
pp. 1080-1105 ◽  
Author(s):  
Diana Comte ◽  
Daniel Carrizo ◽  
Steven Roecker ◽  
Francisco Ortega-Culaciati ◽  
Sophie Peyrat
Keyword(s):  
Elastic Wave ◽  
Subduction Zone ◽  
Three Dimensional ◽  
Northern Chile ◽  
Wave Speeds

scholarly journals P wave tomography and anisotropy beneath Southeast Asia: Insight into mantle dynamics

2015 ◽  
Vol 120 (7) ◽  
pp. 5154-5174 ◽  
Author(s):  
Zhouchuan Huang ◽  
Dapeng Zhao ◽  
Liangshu Wang
Keyword(s):  
Southeast Asia ◽  
P Wave ◽  
Mantle Dynamics ◽  
Wave Tomography ◽  
Insight Into

scholarly journals The geopolitics of presence and absence at the ruins of Fort Henry

2020 ◽  
pp. 026377582096014
Author(s):  
Jacob C Miller ◽  
Manuel Prieto ◽  
Xurxo M. Ayán Vila
Keyword(s):  
Material Culture ◽  
Object Oriented ◽  
Northern Chile ◽  
Border Regions ◽  
Left Behind ◽  
The World ◽  
Human World ◽  
Theories Of Subjectivity ◽  
Theoretical Considerations ◽  
Insight Into

In recent years, scholars have examined the non- or more-than-human world from a variety of unique positions. This article draws on contemporary archaeology and assemblage theories in geography to put forward an understanding of everyday geopolitics that includes the presence of objects in the formation of state subjectivity. Our approach, however, reveals not only this disciplining force of objects but also the ontological absences that are also at the heart of post-structuralist theories of subjectivity. As such, the formation of object-oriented geopolitical subjectivity is also always haunted by these other affective forces that are part of being in the world. These theoretical considerations are substantiated in our study of the material culture of a military outpost in the highlands of northern Chile where the objects left behind by soldiers offer insight into the complexities of state subjectification and state–society relations in border regions.

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