A semi-quantitative method to combine tectonic stress indicators: example from the Southern Calabrian Arc (Italy)

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Published: Dec 27, 2020
DOI: https://doi.org/10.12681/bgsg.23485
Keywords:
stress indicators stress field active tectonics Calabrian Arc Sicily
Salvatore Scudero
Istituto Nazionale di Geofisica e Vulcanologia, Osservatorio Nazionale Terremoti, Via di Vigna Murata 605, 00143, Rome, Italy
https://orcid.org/0000-0003-1585-882X
Giorgio De Guidi
University of Catania
Riccardo Caputo
Department of Physics & Earth Sciences, University of Ferrara, via Saragat 1, 44122 Ferrara, Italy
Vincenzo Perdicaro
Department of Biological, Geological and Environmental Sciences, University of Catania, Corso Italia 55, 95129
Abstract

Databases of tectonic stress indicators are commonly based on different types of observations at different spatial and temporal scales. Each single indicator can be variously representative of the real stress field and the relative importance of all the indicators should be accounted for before any following elaboration. We propose a semi-quantitative procedure which assigns weights to each indicator on the basis of its quality and its representative volume. In this way the indicators can be reliably combined to produce, for example, stress field maps or stress trajectories. The proposed weighting criterion has been applied to a dataset of 440 crustal stress indicators specifically compiled, gathering focal mechanisms and geological data from the literature, and original data from structural features derived from devoted fieldwork, for the southern part of the Calabrian Arc (Italy). This area represents an interesting case study because of its complex geodynamic and structural arrangement. Data were ranked and the orientation of the minimum horizontal stress (Sh) has been interpolated and smoothed on a regular grid. We drew maps of the principal stress axes and inferred the stress regimes over the investigated area. Results are in agreement with independent information from the literature and display the non-uniform orientation of the tectonic stresses and the occurrence of perturbations both at regional and local scale.

Article Details
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  • Tectonics and Geodynamics
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Author Biographies
Salvatore Scudero, Istituto Nazionale di Geofisica e Vulcanologia, Osservatorio Nazionale Terremoti, Via di Vigna Murata 605, 00143, Rome, Italy
Osservatorio Nazionale Terremoti, Via di Vigna Murata 605, 00143, Rome
Giorgio De Guidi, University of Catania
Department of Biological, Geological and Environmental Sciences, Corso Italia 55, 9512
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