Buried Alive: Imaging the 9 November 2022, Mw 5.5 Earthquake Source on the Offshore Adriatic Blind Thrust Front of the Northern Apennines (Italy)

Maesano, Francesco Emanuele; Buttinelli, Mauro; Maffucci, Roberta; Toscani, Giovanni; Basili, Roberto; Bonini, Lorenzo; Burrato, Pierfrancesco; Fedorik, Jakub; Fracassi, Umberto; Panara, Yuri; Tarabusi, Gabriele; Tiberti, Mara Monica; Valensise, Gianluca; Vallone, Roberto; Vannoli, Paola

doi:10.1029/2022gl102299

Cited by 4 publications

(2 citation statements)

References 78 publications

(132 reference statements)

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“…2 b). Shallow buried anticlines are well mapped in the upper 5–6 crustal kilometers 20 – 22 . They developed above 20°–35° dipping ramps splaying from a regional basal décollement located at depth and dipping between 1° and 7° toward the west 32 .…”

Section: Discussionmentioning

confidence: 99%

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Seismic source identification of the 9 November 2022 Mw 5.5 offshore Adriatic sea (Italy) earthquake from GNSS data and aftershock relocation

Pezzo

Billi

Carminati

et al. 2023

Sci Rep

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The fast individuation and modeling of faults responsible for large earthquakes are fundamental for understanding the evolution of potentially destructive seismic sequences. This is even more challenging in case of buried thrusts located in offshore areas, like those hosting the 9 November 2022 Ml 5.7 (Mw 5.5) and ML 5.2 earthquakes that nucleated along the Apennines compressional front, offshore the northern Adriatic Sea. Available on- and offshore (from hydrocarbon platforms) geodetic observations and seismological data provide robust constraints on the rupture of a 15 km long, ca. 24° SSW-dipping fault patch, consistent with seismic reflection data. Stress increase along unruptured portion of the activated thrust front suggests the potential activation of longer portions of the thrust with higher magnitude earthquake and larger surface faulting. This unpleasant scenario needs to be further investigated, also considering their tsunamigenic potential and possible impact on onshore and offshore human communities and infrastructures.

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Section: Discussionmentioning

confidence: 99%

“…2 ). The November 2022 seismic sequence is located along the most external structure of the Apennine orogen 20 – 22 . In the epicentral area, only poor-quality vintage public seismic profiles are available, and it hazardous, to discriminate fault planes at depth (Fig.…”

Section: Geological Settingmentioning

confidence: 99%

Seismic source identification of the 9 November 2022 Mw 5.5 offshore Adriatic sea (Italy) earthquake from GNSS data and aftershock relocation

Pezzo

Billi

Carminati

et al. 2023

Sci Rep

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Quaternary slip-rates probabilistic estimation for the Northern Apennines frontal thrust in the Po Plain (Northern Italy) by integrating surface and subsurface data

Maesano,

Zuffetti,

Abbate

et al. 2024

Tectonophysics

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Offshore Fault Geometry Revealed from Earthquake Locations Using New State-of-Art Techniques: The Case of the 2022 Adriatic Sea Earthquake Sequence

An,

Grigoli,

Enescu

et al. 2024

Seismological Research Letters

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Precise hypocenter locations are critical for properly interpreting earthquake occurrence processes. However, when the coverage with seismic stations is unfavorable or sparse, locating precisely earthquake hypocenters, in particular their depth, is challenging. Here we apply a newly developed approach, which uses only two land stations, to the recently occurred 2022 Adriatic Sea offshore earthquake sequence (mainshock of magnitude Mw 5.5) and achieve location results that are comparable to the catalog locations obtained using dozens of stations. First, six events with magnitudes M ≥3.0 were relocated using a travel-time stacking method. Next, using these six earthquakes as reference events, we applied a two-station differential travel-time method to reconstruct the earthquake cluster geometry and locate the remaining events, including the mainshock. The obtained earthquake distribution shows a dipping direction that varies from south to southwest, depending on the choice of the input parameters. Our preferred result shows a cluster dipping at an angle of ∼30° toward the south-southwest. This solution was chosen because the depth of the mainshock hypocenter obtained using the differential-time procedure agrees well with the depth constrained using depth phases. Moreover, the relatively sharp earthquake cluster geometry is in general consistent with the thrust fault structures revealed by a local seismic reflection survey and focal mechanism solutions.

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Buried Alive: Imaging the 9 November 2022, Mw 5.5 Earthquake Source on the Offshore Adriatic Blind Thrust Front of the Northern Apennines (Italy)

Cited by 4 publications

References 78 publications

Seismic source identification of the 9 November 2022 Mw 5.5 offshore Adriatic sea (Italy) earthquake from GNSS data and aftershock relocation

Seismic source identification of the 9 November 2022 Mw 5.5 offshore Adriatic sea (Italy) earthquake from GNSS data and aftershock relocation

Quaternary slip-rates probabilistic estimation for the Northern Apennines frontal thrust in the Po Plain (Northern Italy) by integrating surface and subsurface data

Offshore Fault Geometry Revealed from Earthquake Locations Using New State-of-Art Techniques: The Case of the 2022 Adriatic Sea Earthquake Sequence

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