Publication Date:
2021-01-19
Description:
To unravel how and where coseismic and interseismic deformation impacts the spatial and
temporal patterns of rock uplift of the Lurestan sector of the Zagros Mountains, we performed an
investigation of the large‐scale features of topography and river network coupled with 2‐D finite element
modeling. Geomorphological analysis and constraints from parameters such as elevation, local relief,
normalized channel steepness index (ksn), river longitudinal profiles, and transformed river profiles
(chi plots) were used to unravel the time‐space distribution of vertical motions. Whereas the much longer
timescale over which topography grows and/or rivers respond to tectonic or climatic perturbations with
respect to even multiple seismic cycles, the outputs of the finite element model yield fundamental
information on the source of the late part of the spatiotemporal evolution of surface uplift recorded by the
geomorphology. Model outputs shed new light into the processes controlling relief evolution in an
actively growing mountain belt underlain by a major blind thrust. The outputs illustrate how coseismic slip
controls localized uplift of a prominent topographic feature—the Mountain Front Flexure—located
above the main upper crustal ramp of the principal basement thrust fault of the region, while continuous
displacement along the deeper, aseismic portion of the same basement fault controls generalized uplift
of the whole crustal block located farther to the NE, in the interior of the orogen.
Description:
Published
Description:
e2020TC006402
Description:
2T. Deformazione crostale attiva
Description:
JCR Journal
Keywords:
Morphotectonic analysis
;
Finite element modeling
;
interseismic deformation
;
coseismic deformation
;
frontal topographic feature
;
04.07. Tectonophysics
Repository Name:
Istituto Nazionale di Geofisica e Vulcanologia (INGV)
Type:
article
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