Database of active and potentially-active continental faults in Chile at 1:25,000 scale

Melnick, Daniel; Maldonado, Valentina; Contreras, Mauricio

doi:10.1594/pangaea.922241

2020

DOI: 10.1594/pangaea.922241

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Database of active and potentially-active continental faults in Chile at 1:25,000 scale

Daniel Melnick¹,

Valentina Maldonado²,

Mauricio Contreras³

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“…Surface-strain rate of the reference model. (a) Strain rate superposed with compiled faults(Broens & Pereira, 2005;Costa et al, 2020;Eisermann et al, 2021;Folguera & Zárate, 2011;García, 2001;Giambiagi et al, 2003;Jensen, 2018;Litvak et al, 2018;Martínez et al, 2017;Martino et al, 2016;Meeßen et al, 2018;Melnick et al, 2020;Moscoso & Mpodozis, 1988;Olivar et al, 2018;Riesner et al, 2018). (b) Close-up of the Sierras Pampeanas morphotectonic province and extensional faults and terrane sutures in redWimpenny, 2022).…”

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confidence: 99%

Localization of Deformation in a Non‐Collisional Subduction Orogen: The Roles of Dip Geometry and Plate Strength on the Evolution of the Broken Andean Foreland, Sierras Pampeanas, Argentina

Pons,

Rodriguez Piceda,

Sobolev

et al. 2023

Tectonics

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The southern Central Andes (SCA, 27°S–40°S) exhibit a complex deformation pattern that is influenced by multiple factors, including the present‐day dip angle of the subducting oceanic Nazca plate and the influence of inherited heterogeneities in the continental South American plate. This study employs a data‐driven geodynamic workflow to assess the role of various forcing factors in determining upper‐plate strain localization, both above the flat slab and the steeper segment to the south. These include the dip angle of the Nazca plate, the mechanically weak sedimentary basins, the thickness and composition of the continental crust, the strength of the subduction interface, and the plate velocities. Our modeling results predict two main deformation modes: (i) pure‐shear shortening in the broken foreland above the flat‐slab segment and eastward propagation of deformation, and (ii) simple‐shear shortening restricted to the eastern margin of the Andean fold‐and‐thrust belt above the steep‐slab segment. While the convergence velocity and the frictional strength of the subduction interface primarily control the intensity of the deformation, inherited heterogeneities tend to localize deformation, and weak sediments leads to intensified surface deformation. Thicker crust and surface topography also influences strain localization by transferring stress to the eastern orogenic front. Above the flat‐slab segment deformation migrates eastward, which is facilitated by enhanced interface coupling. The transition between the steep and sub‐horizontal subduction segments is characterized by a diffuse transpressional shear zone, likely controlled by the change in dip geometry of the Nazca plate, and the presence of inherited faults and weak sedimentary basins.

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mentioning

confidence: 99%

Localization of Deformation in a Non‐Collisional Subduction Orogen: The Roles of Dip Geometry and Plate Strength on the Evolution of the Broken Andean Foreland, Sierras Pampeanas, Argentina

Pons,

Rodriguez Piceda,

Sobolev

et al. 2023

Tectonics

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A comprehensive database of active and potentially-active continental faults in Chile at 1:25,000 scale

2021

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In seismically-active regions, mapping active and potentially-active faults is the first step to assess seismic hazards and site selection for paleoseismic studies that will estimate recurrence rates. Here, we present a comprehensive database of active and potentially-active continental faults in Chile based on existing studies and new mapping at 1:25,000 scale using geologic and geomorphic criteria and digital elevation models derived from TanDEM-X and LiDAR data. The database includes 958 fault strands grouped into 17 fault systems and classified based on activity (81 proved, 589 probable, 288 possible). The database is a contribution to the world compilation of active faults with applications among others in seismic hazard assessments, territorial planning, paleoseismology, geodynamics, landscape evolution processes, geothermal exploration, and in the study of feedbacks between continental deformation and the plate-boundary seismic cycle along subduction zones.

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Database of active and potentially-active continental faults in Chile at 1:25,000 scale

Cited by 2 publications

References 0 publications

Localization of Deformation in a Non‐Collisional Subduction Orogen: The Roles of Dip Geometry and Plate Strength on the Evolution of the Broken Andean Foreland, Sierras Pampeanas, Argentina

Localization of Deformation in a Non‐Collisional Subduction Orogen: The Roles of Dip Geometry and Plate Strength on the Evolution of the Broken Andean Foreland, Sierras Pampeanas, Argentina

A comprehensive database of active and potentially-active continental faults in Chile at 1:25,000 scale

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