Publication Date:
2023-02-01
Description:
We present the first seismic reflection images of the Paganica and Bazzano basins, two tectonic
basins developed in the hanging wall of the Paganica-San Demetrio Fault System, the causative fault of the
2009 Mw 6.1 L'Aquila earthquake, Italy. Five high-resolution seismic profiles were acquired along a main, 7
km long transect cutting across the strands of an active fault system in urbanized areas with widespread sources
of seismic noise. Three processing approaches were chosen to tackle a variable and site-dependent data quality.
To aid interpretation of this complex setting, we complemented seismic amplitude images with energy and
similarity attributes as well with post-stack acoustic impedance inversion. The final seismic sections expose,
with unprecedented resolution, the basins' structure and the uppermost splays of the 2009 earthquake. The
seismic data show fine details of the subsurface stratigraphic setting, revealing continental depocenters carved
in the marine Meso-Cenozoic substratum and displaced by a series of conjugate normal faults, mostly unknown
before this study. Several of the imaged fault strands connect to the 2009 coseismic surface ruptures. Matching
the seismic interpretation with constraints from surface geology and shallow boreholes, published data from
field surveys and scientific drilling, we present a structural map of the Bazzano and Paganica basins with an
estimation of the depth of the Meso-Cenozoic substratum. This map highlights a different structure, evolution,
and age of the two basins, with the older Bazzano basin that likely began to form in late Pliocene.
Description:
Published
Description:
e2022TC007207
Description:
2T. Deformazione crostale attiva
Description:
JCR Journal
Repository Name:
Istituto Nazionale di Geofisica e Vulcanologia (INGV)
Type:
article
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