Earthquakes and cluster dynamics during interseismic phases between the Northern and Central Apennines (Italy)

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ID: 331529
2026
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Abstract
Summary In the last thirty years, the Northern and Central Apennines (Italy) have been affected by three main destructive seismic sequences: the 1997 Colfiorito (three events ML > 5.5), the 2009 L’Aquila (one event ML > 5.5), and the 2016–2017 Amatrice-Visso-Norcia (three events ML > 5.5). Several studies have analysed the spatial-temporal evolution and processes driving each sequence, focused more on the foreshock-mainshock-aftershocks dynamics. Here, we focus on the 2018–2024 interseismic period, aiming to unravel the long-term seismogenic behaviour of this region. We first relocated the earthquake catalogue and identified clusters through a declustering algorithm. During this phase, background seismicity and most of the clusters were arranged in a 2-3 km thick low- angle layer. We found that (i) most clusters were driven by an aseismic process, (ii) the depth of both clusters and seismicity layer increased toward the southeast, (iii) the volume of clusters decreases to the southeast, (iv) the low-angle layer almost disappeared in the L’Aquila area. Comparing two interseismic phases (2011–2016 and 2018–2024), we found striking similarities with events occurring on same sites and characterized by both foreshock-mainshock-aftershocks and swarm-like behaviour. In addition to this, the L’Aquila area was seismically more “silent” compared to the norther sites during both interseismic phases. We propose that these different long-term seismogenic behaviours may reflect variation in the structure and rheology of the upper crust moving from the Northern to the Central Apennines. This highlights the important role of the structural inheritance in controlling how the active deformation can affect the interseismic period.
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Authors Marion Baques, Piero Poli, Michele Fondriest
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Journal geophysical journal international
Year 2026
DOI
10.1093/gji/ggag396
URL
https://doi.org/10.1093/gji/ggag396
Keywords Keywords not found

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