Publication Date:
2017-04-04
Description:
Normal faults within orogenic belts can be pre-, syn- or post-orogenic features. We studied the Gubbio normal fault (central Italy), which is
an example of a pre-orogenic fault reactivated in a post-orogenic stage. The Gubbio Fault is a 22-km-long fault bordering a Quaternary basin
and part of an active faults system in the Umbria–Marche region (Central Italy). The interpretation of a set of seismic profiles enables us to
reconstruct the fault geometry in detail and to measure displacement and throw distributions along the fault strike. Seismic data indicate that
the Gubbio Fault represents an example of multiple reactivation: at least a portion of the fault was active in the Miocene and only a part of the
total displacement was achieved in the Quaternary. The reconstruction of the fault geometry at depth shows that the fault is characterised by
listric geometry. The fault is also characterised by a bend along strike and structure contours show that this geometry is maintained at depth.
As the fault is commonly addressed as presently active, the maximum fault dimensions are correlated to the maximum expected earthquake,
and the presence of the fault bend is discussed as a possible barrier to seismic ruptures propagation.
Description:
Published
Description:
(2233–2249)
Description:
reserved
Keywords:
Listric normal faults
;
Fault reactivation
;
Seismic profiles
;
Displacement distribution
;
Earthquakes
;
04. Solid Earth::04.06. Seismology::04.06.01. Earthquake faults: properties and evolution
Repository Name:
Istituto Nazionale di Geofisica e Vulcanologia (INGV)
Type:
article
Format:
2540699 bytes
Format:
application/pdf
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