Publication Date:
2020-01-28
Description:
The Matese and Beneventano areas coincide with the transition from the central to the
southern Apennines and are characterized by both SW- and NE-dipping normal faulting seismogenic
structures, responsible for the large historical earthquakes. We studied the Matese and Beneventano
seismicity by means of high-precision locations of earthquakes spanning from 29 December 2013
to 4 September 2018. Events were located by using all of the available data from temporary and
permanent stations in the area and a 1D computed velocity model, inverting the dataset with the Velest
code. For events M 〉 2.8 we used P- and S-waves arrival times of the strong motion stations located
in the study area. A constant value of 1.83 for Vp/Vs was computed with a modified Wadati method.
The dataset consists of 2378 earthquakes, 18,715 P- and 12,295 S-wave arrival times. We computed
55 new fault plane solutions. The mechanisms show predominantly normal fault movements, with
T-axis trends oriented NE–SW. Only relatively small E–W trending clusters in the eastern peripheral
zones of the Apenninic belt show right-lateral strike-slip kinematics similar to that observed in the
Potenza (1990–1991) and Molise (2002 and 2018) sequences. These belong to transfer zones associated
with di erential slab retreat of the Adriatic plate subduction beneath the Apennines. The Matese
sequence (December 2013–February 2014; main shock Mw 5.0) is the most relevant part of our dataset.
Hypocentral depths along the axis of the Apenninic belt are in agreement with previous seismological
studies that place most of the earthquakes in the brittle upper crust. We confirm a general deepening
of seismicity moving from west to the east along the Apennines. Seismicity depth is controlled by
heat-flow, which is lower in the eastern side, thus causing a deeper brittle–ductile transition.
Description:
Published
Description:
id 17
Description:
4IT. Banche dati
Description:
JCR Journal
Keywords:
seismogenic structures
;
hypocentral determination
;
1D velocity model
;
central–southern Italy
;
04.06. Seismology
Repository Name:
Istituto Nazionale di Geofisica e Vulcanologia (INGV)
Type:
article
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