New seismological data from the Calabrian arc reveal arc-orthogonal extension across the subduction zone

Abstract The Calabrian Arc subduction-rollback system along the convergent Africa/Eurasia plate boundary is among the most active geological structures in the Mediterranean Sea. However, its seismogenic behaviour is largely unknown, mostly due to the lack of seismological observations. We studied lo...

Descripción completa

Guardado en:

Detalles Bibliográficos
Autores principales:	Tiziana Sgroi, Alina Polonia, Graziella Barberi, Andrea Billi, Luca Gasperini
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/bbab2d3876bf46bfbd588458fc9230cc
Etiquetas:	Agregar Etiqueta Sin Etiquetas, Sea el primero en etiquetar este registro!

id	oai:doaj.org-article:bbab2d3876bf46bfbd588458fc9230cc
record_format	dspace
spelling	oai:doaj.org-article:bbab2d3876bf46bfbd588458fc9230cc2021-12-02T14:01:20ZNew seismological data from the Calabrian arc reveal arc-orthogonal extension across the subduction zone10.1038/s41598-020-79719-82045-2322https://doaj.org/article/bbab2d3876bf46bfbd588458fc9230cc2021-01-01T00:00:00Zhttps://doi.org/10.1038/s41598-020-79719-8https://doaj.org/toc/2045-2322Abstract The Calabrian Arc subduction-rollback system along the convergent Africa/Eurasia plate boundary is among the most active geological structures in the Mediterranean Sea. However, its seismogenic behaviour is largely unknown, mostly due to the lack of seismological observations. We studied low-to-moderate magnitude earthquakes recorded by the seismic network onshore, integrated by data from a seafloor observatory (NEMO-SN1), to compute a lithospheric velocity model for the western Ionian Sea, and relocate seismic events along major tectonic structures. Spatial changes in the depth distribution of earthquakes highlight a major lithospheric boundary constituted by the Ionian Fault, which separates two sectors where thickness of the seismogenic layer varies over 40 km. This regional tectonic boundary represents the eastern limit of a domain characterized by thinner lithosphere, arc-orthogonal extension, and transtensional tectonic deformation. Occurrence of a few thrust-type earthquakes in the accretionary wedge may suggest a locked subduction interface in a complex tectonic setting, which involves the interplay between arc-orthogonal extension and plate convergence. We finally note that distribution of earthquakes and associated extensional deformation in the Messina Straits region could be explained by right-lateral displacement along the Ionian Fault. This observation could shed new light on proposed mechanisms for the 1908 Messina earthquake.Tiziana SgroiAlina PoloniaGraziella BarberiAndrea BilliLuca GasperiniNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-15 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Tiziana Sgroi Alina Polonia Graziella Barberi Andrea Billi Luca Gasperini New seismological data from the Calabrian arc reveal arc-orthogonal extension across the subduction zone
description	Abstract The Calabrian Arc subduction-rollback system along the convergent Africa/Eurasia plate boundary is among the most active geological structures in the Mediterranean Sea. However, its seismogenic behaviour is largely unknown, mostly due to the lack of seismological observations. We studied low-to-moderate magnitude earthquakes recorded by the seismic network onshore, integrated by data from a seafloor observatory (NEMO-SN1), to compute a lithospheric velocity model for the western Ionian Sea, and relocate seismic events along major tectonic structures. Spatial changes in the depth distribution of earthquakes highlight a major lithospheric boundary constituted by the Ionian Fault, which separates two sectors where thickness of the seismogenic layer varies over 40 km. This regional tectonic boundary represents the eastern limit of a domain characterized by thinner lithosphere, arc-orthogonal extension, and transtensional tectonic deformation. Occurrence of a few thrust-type earthquakes in the accretionary wedge may suggest a locked subduction interface in a complex tectonic setting, which involves the interplay between arc-orthogonal extension and plate convergence. We finally note that distribution of earthquakes and associated extensional deformation in the Messina Straits region could be explained by right-lateral displacement along the Ionian Fault. This observation could shed new light on proposed mechanisms for the 1908 Messina earthquake.
format	article
author	Tiziana Sgroi Alina Polonia Graziella Barberi Andrea Billi Luca Gasperini
author_facet	Tiziana Sgroi Alina Polonia Graziella Barberi Andrea Billi Luca Gasperini
author_sort	Tiziana Sgroi
title	New seismological data from the Calabrian arc reveal arc-orthogonal extension across the subduction zone
title_short	New seismological data from the Calabrian arc reveal arc-orthogonal extension across the subduction zone
title_full	New seismological data from the Calabrian arc reveal arc-orthogonal extension across the subduction zone
title_fullStr	New seismological data from the Calabrian arc reveal arc-orthogonal extension across the subduction zone
title_full_unstemmed	New seismological data from the Calabrian arc reveal arc-orthogonal extension across the subduction zone
title_sort	new seismological data from the calabrian arc reveal arc-orthogonal extension across the subduction zone
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/bbab2d3876bf46bfbd588458fc9230cc
work_keys_str_mv	AT tizianasgroi newseismologicaldatafromthecalabrianarcrevealarcorthogonalextensionacrossthesubductionzone AT alinapolonia newseismologicaldatafromthecalabrianarcrevealarcorthogonalextensionacrossthesubductionzone AT graziellabarberi newseismologicaldatafromthecalabrianarcrevealarcorthogonalextensionacrossthesubductionzone AT andreabilli newseismologicaldatafromthecalabrianarcrevealarcorthogonalextensionacrossthesubductionzone AT lucagasperini newseismologicaldatafromthecalabrianarcrevealarcorthogonalextensionacrossthesubductionzone
_version_	1718392224801095680

New seismological data from the Calabrian arc reveal arc-orthogonal extension across the subduction zone

Ejemplares similares