Temporal and spatial variability of S-wave and coda attenuation in the Central Apennines, Italy
The central Apennines are notoriously subject to important seismic sequences, such as the 2009 and 2016–2017, L’Aquila, Amatrice-Visso-Norcia (AVN) sequences, respectively. Here, we examine the temporal and spatial variation of the S-wave attenuation in Central Italy over a period from 2011 to 2017,...
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Frontiers Media S.A.
2025-01-01
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| Series: | Frontiers in Earth Science |
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| Online Access: | https://www.frontiersin.org/articles/10.3389/feart.2024.1487797/full |
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| author | Simona Gabrielli Aybige Akinci Edoardo Del Pezzo Edoardo Del Pezzo |
| author_facet | Simona Gabrielli Aybige Akinci Edoardo Del Pezzo Edoardo Del Pezzo |
| author_sort | Simona Gabrielli |
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| description | The central Apennines are notoriously subject to important seismic sequences, such as the 2009 and 2016–2017, L’Aquila, Amatrice-Visso-Norcia (AVN) sequences, respectively. Here, we examine the temporal and spatial variation of the S-wave attenuation in Central Italy over a period from 2011 to 2017, including the AVN sequence. First, we computed the S-wave attenuation (Qβ) as a function of frequency Q(f) using the coda normalization method. Then, to visualize the spatial variation of the attenuation over time, we calculated the attenuation of coda waves using a novel 2D kernel-based function over the study area. Our results showed a 13% variation in S-wave attenuation between the pre-sequence (2011–2016) and the sequence phase, with a significant 37% decrease in Q (increase in attenuation) detected during the Visso period. Spatially, a high attenuation anomaly aligns with the Monti Sibillini thrust formation, while in time, we observed a northward migration of this high attenuation during the Norcia phase. Temporal variation in the crustal S-wave attenuation and its frequency dependence may be linked to fluid movement and fracturing developed during the AVN sequence. Coda-Q mapping confirmed an increase in attenuation during the sequence within the fault plane zones. Additionally, the broader area of interest reveals a northward extension of high attenuation, following the NS direction of the Monti Sibillini thrust. |
| format | Article |
| id | doaj-art-d74b18027fdc4e2a91f416a919121bb0 |
| institution | Kabale University |
| issn | 2296-6463 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | Frontiers Media S.A. |
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| spelling | doaj-art-d74b18027fdc4e2a91f416a919121bb02025-01-13T11:07:15ZengFrontiers Media S.A.Frontiers in Earth Science2296-64632025-01-011210.3389/feart.2024.14877971487797Temporal and spatial variability of S-wave and coda attenuation in the Central Apennines, ItalySimona Gabrielli0Aybige Akinci1Edoardo Del Pezzo2Edoardo Del Pezzo3Sezione Roma 1, Istituto Nazionale di Geofisica e Vulcanologia, Rome, ItalySezione Roma 1, Istituto Nazionale di Geofisica e Vulcanologia, Rome, ItalyOsservatorio Vesuviano, Istituto Nazionale di Geofisica e Vulcanologia, Napoli, ItalyIstituto Andaluz de Geofisica, Universidad de Granada, Granada, SpainThe central Apennines are notoriously subject to important seismic sequences, such as the 2009 and 2016–2017, L’Aquila, Amatrice-Visso-Norcia (AVN) sequences, respectively. Here, we examine the temporal and spatial variation of the S-wave attenuation in Central Italy over a period from 2011 to 2017, including the AVN sequence. First, we computed the S-wave attenuation (Qβ) as a function of frequency Q(f) using the coda normalization method. Then, to visualize the spatial variation of the attenuation over time, we calculated the attenuation of coda waves using a novel 2D kernel-based function over the study area. Our results showed a 13% variation in S-wave attenuation between the pre-sequence (2011–2016) and the sequence phase, with a significant 37% decrease in Q (increase in attenuation) detected during the Visso period. Spatially, a high attenuation anomaly aligns with the Monti Sibillini thrust formation, while in time, we observed a northward migration of this high attenuation during the Norcia phase. Temporal variation in the crustal S-wave attenuation and its frequency dependence may be linked to fluid movement and fracturing developed during the AVN sequence. Coda-Q mapping confirmed an increase in attenuation during the sequence within the fault plane zones. Additionally, the broader area of interest reveals a northward extension of high attenuation, following the NS direction of the Monti Sibillini thrust.https://www.frontiersin.org/articles/10.3389/feart.2024.1487797/fullS-wave attenuationcentral Italy seismic sequencecoda normalizationregionalizationcoda wavestime variation |
| spellingShingle | Simona Gabrielli Aybige Akinci Edoardo Del Pezzo Edoardo Del Pezzo Temporal and spatial variability of S-wave and coda attenuation in the Central Apennines, Italy Frontiers in Earth Science S-wave attenuation central Italy seismic sequence coda normalization regionalization coda waves time variation |
| title | Temporal and spatial variability of S-wave and coda attenuation in the Central Apennines, Italy |
| title_full | Temporal and spatial variability of S-wave and coda attenuation in the Central Apennines, Italy |
| title_fullStr | Temporal and spatial variability of S-wave and coda attenuation in the Central Apennines, Italy |
| title_full_unstemmed | Temporal and spatial variability of S-wave and coda attenuation in the Central Apennines, Italy |
| title_short | Temporal and spatial variability of S-wave and coda attenuation in the Central Apennines, Italy |
| title_sort | temporal and spatial variability of s wave and coda attenuation in the central apennines italy |
| topic | S-wave attenuation central Italy seismic sequence coda normalization regionalization coda waves time variation |
| url | https://www.frontiersin.org/articles/10.3389/feart.2024.1487797/full |
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