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http://hdl.handle.net/2122/16051
Authors: | De Gori, Pasquale* Lucente, Francesco Pio* Govoni, Aladino* Margheriti, Lucia* Chiarabba, Claudio* |
Title: | Seismic swarms in the Pollino seismic gap: Positive fault inversion within a popup structure | Journal: | Frontiers in Earth Science | Series/Report no.: | /10 (2022) | Publisher: | Frontiers Media S.A. | Issue Date: | 2022 | DOI: | 10.3389/feart.2022.968187 | URL: | https://www.frontiersin.org/articles/10.3389/feart.2022.968187/full | 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. |
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feart-10-968187.pdf | Open Access published article | 3.26 MB | Adobe PDF | View/Open |
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