Interplay of tectonic and dynamic processes shaping multilayer extensional system in southern-central Apennines.

Autor: de Nardis R; University of Chieti-Pescara, via dei Vestini 31, 66100, Chieti, Italy. rita.denardis@unich.it.; CRUST - Centro inteRUniversitario per l'analisi SismoTettonica tridimensionale, Chieti, Italy. rita.denardis@unich.it., Vuan A; National Institute of Oceanography and Applied Geophysics - OGS, Trieste, Italy.; Istituto Nazionale di Geofisica e Vulcanologia, INGV - Centro Nazionale Terremoti, Roma, Italy., Carbone L; University of Chieti-Pescara, via dei Vestini 31, 66100, Chieti, Italy.; CRUST - Centro inteRUniversitario per l'analisi SismoTettonica tridimensionale, Chieti, Italy., Talone D; University of Chieti-Pescara, via dei Vestini 31, 66100, Chieti, Italy.; CRUST - Centro inteRUniversitario per l'analisi SismoTettonica tridimensionale, Chieti, Italy., Romano MA; National Institute of Oceanography and Applied Geophysics - OGS, Trieste, Italy., Lavecchia G; University of Chieti-Pescara, via dei Vestini 31, 66100, Chieti, Italy.; CRUST - Centro inteRUniversitario per l'analisi SismoTettonica tridimensionale, Chieti, Italy.
Jazyk: angličtina
Zdroj: Scientific reports [Sci Rep] 2024 Aug 07; Vol. 14 (1), pp. 18375. Date of Electronic Publication: 2024 Aug 07.
DOI: 10.1038/s41598-024-69118-8
Abstrakt: High-hazard seismic zones can remain silent over centuries with meager seismicity rates challenging our understanding of seismic processes. We focus on the comprehensive analysis of cascading episodes of swarms and seismic sequences following the 2009 L'Aquila mainshock (M W 6.3) in the southern-central Apennine that previously experienced ~ M7 earthquakes. We enhance the seismic catalog, unmasking low-magnitude seismicity down to completeness magnitude M L  ~ 0, and we unveil that the microseismicity might be secondarily triggered by the L'Aquila mainshock, influencing the frictional properties in the nearby fault zones or opening fault valves generating the intense seismic activity detected from 2009 to 2013. The diffusivity, observed in the most seismic episodes, and the high Vp/Vs values (> 1.88) indicate fluid circulation promoting multilayered extensional seismicity within 11-15 km and 16-23 km depth ranges. Mapping the 3D distribution of seismicity alongside geological data reveals an evident tectonic influence, unveiling unknown geometric aspects and providing the first evidence of a NNE-dipping deformation zone bounding at depths of 11-15 km the overlying fault system. Deeper seismicity suggests a mantellic CO 2 ascending shape. These findings enrich the literature on tectonic seismic swarms in extensional domains, providing essential constraints on fluid involvement in the seismic processes and contributing to forthcoming discussions on the seismotectonic setting in high-seismic-risk areas of the Apennines of Italy.
(© 2024. The Author(s).)
Databáze: MEDLINE
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