Seismic swarms in the Pollino seismic gap: Positive fault inversion within a popup structure

De Gori, Pasquale and Lucente, Francesco Pio and Govoni, Aladino and Margheriti, Lucia and Chiarabba, Claudio (2022) Seismic swarms in the Pollino seismic gap: Positive fault inversion within a popup structure. Frontiers in Earth Science, 10. ISSN 2296-6463

[thumbnail of pubmed-zip/versions/1/package-entries/feart-10-968187/feart-10-968187.pdf] Text
pubmed-zip/versions/1/package-entries/feart-10-968187/feart-10-968187.pdf - Published Version

Download (3MB)

Abstract

Seismic swarms frequently occur along continental fault systems and their relation with large earthquakes is often contradictory. Such a case is documented in the Pollino mountain range of southern Italy, a decoupling zone where the belt-normal stretching drastically rotates accommodating the differential SE-retreat of the Ionian slab. The paucity of historical large earthquakes has led to hypothesize the presence of a seismic gap. A long-lasting seismic swarm that climaxed with a ML = 5.2 earthquake in October 2012 was therefore thought as a possible signal of an impending large earthquake filling the gap. Seismicity data collected during a 4-years long monitoring are a powerful microscope to look through the seismic swarm. In this study, we present accurate relocations for 2385 earthquakes and high-resolution Vp and Vp/Vs models of the fault system. Seismicity occurred on two separate normal faults that were formerly part of a thrusts and back-thrusts system, originally formed as a pop-up at restraining bends of the Pollino fault, a wrench fault system that inverted the original left lateral sense of slip accommodating a differential motion induced by the southward retreat of the Ionian slab.

Item Type: Article
Subjects: Digital Open Archives > Geological Science
Depositing User: Unnamed user with email support@digiopenarchives.com
Date Deposited: 25 Feb 2023 11:06
Last Modified: 13 Sep 2024 07:32
URI: http://geographical.openuniversityarchive.com/id/eprint/444

Actions (login required)

View Item
View Item