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Geomorphic expression of active tectonics in a rapidly-deforming arc, Sila Massif, Calabria, southern Italy
No full textWe examine the tectonic geomorphology of La Sila, Calabria, southern
Italy, a high-standing (1500 m) plateau surrounded by crustal extension, with map,
DEM, and field data. These data are used to constrain a simple geodynamic model that
describes short-wavelength deformation of the plateau rim. Topographic metrics
including drainage patterns, river longitudinal profiles, and swath profiles are consistent
with field stratigraphic relationships collectively suggesting that local tectonic
deformation is embedded within a broader, regional uplift that has increased the mean
elevation of the Sila Plateau during the Quaternary. The concavity, steepness, and
length-gradient index of modeled river longitudinal profiles proved to be the most
useful metrics for recording the effects of locally active faults. A previously unrecognized
horst on the northeastern portion of the plateau was identified with these data.
Nevertheless, the core of the Sila Plateau remains relatively undeformed with respect
to its flanks which are characterized by steep, fault-bounded escarpments. Active
extension has dropped base level for and unloaded the plateau rim, causing deep
fluvial incision and associated flexural uplift of the footwall. This footwall uplift helps
maintain a separate external, and nearly radial drainage away from the plateau along its
flanks, and a nearly closed drainage for the plateau interior. A drainage divide roughly
correlates with the plateau rim, inhibiting the process of drainage integration through
the Sila interior and subsequent landscape dissection. As a result, geomorphic processes
driving erosion of the Sila upland are lagging behind the tectonic processes that
have driven rock uplift leading to an overall increase in mean surface elevation. These
results underscore the importance of the lag times a landscape may endure in
transforming from one tectonic and base level condition to another. We conclude that
the Calabrian forearc has a similar geomorphic evolution as the more northern
Apennines consistent with the emerging view that growth of Apennine topography has
been recent (Quaternary), rapid, and possibly decoupled from rock deformation in
the orogenic wedge
KNICKPOINTS AS GEOMORPHIC MARKERS OF ACTIVE TECTONICS: A CASE STUDY FROM NORTHEASTERN SICILY (SOUTHERN ITALY)
No full textReconstructing forearc migration geodynamics by inverting river long profile: the case study of the Calabrian forearc (Central Mediterranean)
No full textThe role of climate change in drainage network reorganization: insights from numerical experiments
No full textEncoding periodic tectonic forcings in the stratigraphy and geomorphology of a fault-controlled late Pleistocene source-to-sink system
No full textUplift vs. denudation in the southern Apennines: Geomorphologic evidence and constraints from terrestrial cosmogenic nuclides and apatite (U-Th)/He data
No full textSediment Provenance and Encoding of Geomorphic Processes in a Pleistocene Fan-Delta Driven by Periodic Exogenic Forcings
No full textDistinguishing multi-decadal, quasi-periodic autogenic processes from external forcings in deltaic stratigraphy
No full text
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
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