Journal
TECTONICS
Volume 40, Issue 9, Pages -Publisher
AMER GEOPHYSICAL UNION
DOI: 10.1029/2021TC006786
Keywords
seismic tomography; reflection profiling; fault imaging; extensional basin
Categories
Funding
- Italian Civil Protection Department (DPC)
- Centro di Geotecnologie (CGT) of Siena University
- INGV Project Pianeta Dinamico - Ministry of Education, Universities and Research (MIUR) [C.U.P. D53J19000170001]
- Istituto Nazionale di Geofisica e Vulcanologia within the CRUI-CARE Agreement
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The study conducted a high-resolution seismic reflection/refraction experiment on the Vettore-Bove normal fault system ruptured during the 2016 earthquake in central Italy, revealing shallow fault system patterns and continental infill architecture. Seismic imaging uncovered a 1 km-wide fault zone with W-throwing splays and subsidiary faults affecting the continental infill, showing ongoing displacement accumulation of the Vettore-Bove fault system.
The Vettore-Bove normal fault system in central Italy ruptured during the 2016 M-W 6.5 Norcia earthquake causing extensive surface faulting. At the Pian Grande di Castelluccio hanging wall basin, along the southern section of the fault ruptured during the M-W 6.5 mainshock, we performed a high-resolution seismic reflection/refraction experiment aimed at (a) imaging the shallow pattern of the fault system, and (b) reconstructing the architecture of the continental infill. We collected three profiles for a total length of similar to 8 km. We used a reflection processing flow and non-linear refraction tomography to obtain migrated stack sections and P-wave velocity images resolved down to the depth of the pre-Quaternary substratum. The main profile in the northern part of the basin crosses the westernmost splays of the ruptured fault zone striking N150 degrees-170 degrees. Seismic imaging unravels a similar to 1 km-wide fault zone comprising three W-throwing splays and subsidiary faults, which affect the continental infill and produce a minimum aggregate Quaternary throw of similar to 400 +/- 100 m. Recent deformation is localized in this part of the surveyed fault section, attesting active displacement accumulation of the Vettore-Bove fault system. The other profiles in the central-southern part of the basin show additional faults, likely striking N20 degrees-40 degrees and which concurred to generate a similar to 500 m-deep depocenter. These faults were mostly active during an early extensional phase; however, one of them likely displaces shallow layers with a throw close to the resolution limit of seismic data (<10 m), suggesting activity in the Late Pleistocene.
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