The Gubbio normal fault (Central Italy): geometry, displacement distribution and tectonic evolution

Mirabella, Francesco; Ciaccio, Maria Grazia; Barchi, Massimiliano R.; Merlini, Saverio

doi:10.1016/j.jsg.2004.06.009

Cited by 73 publications

(86 citation statements)

References 40 publications

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“…In addition, the best fit of the GPS velocity data is obtained considering some degree of creeping along a portion of the GuF. The mechanical behaviour of the west-dipping GuF is still debated in the literature (Boncio et al, 2000;Mirabella et al, 2004Mirabella et al, , 2008Barchi and Ciaccio, 2009 Westaway et al, 1989) that occurred in 1984 in the area (namely, the Gubbio earthquake) occurred a few kilometres apart (see location in Fig. 1a).…”

Section: Discussionmentioning

confidence: 99%

On the mechanical behaviour of a low-angle normal fault: the Alto Tiberina fault (Northern Apennines, Italy) system case study

et al. 2016

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Abstract. Geological and seismological observations have been used to parameterize 2-D numerical elastic models to simulate the interseismic deformation of a complex extensional fault system located in the Northern Apennines (Italy). The geological system is dominated by the presence of the Alto Tiberina fault (ATF), a large (60 km along strike) lowangle normal fault dipping 20 • in the brittle crust (0-15 km). The ATF is currently characterized by a high and constant rate of microseismic activity, and no moderate-to-large magnitude earthquakes have been associated with this fault in the past 1000 years. Modelling results have been compared with GPS data in order to understand the mechanical behaviour of this fault and a suite of minor syn-and antithetic normal fault segments located in the main fault hanging wall.The results of the simulations demonstrate the active role played by the Alto Tiberina fault in accommodating the ongoing tectonic extension in this sector of the chain. The GPS velocity profile constructed through the fault system cannot be explained without including the ATF's contribution to deformation, indicating that this fault, although misoriented, has to be considered tectonically active and with a creeping behaviour below 5 km depth.The low-angle normal fault also shows a high degree of tectonic coupling with its main antithetic fault (the Gubbio fault), suggesting that creeping along the ATF may control the observed strain localization and the pattern of microseismic activity.

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Section: Discussionmentioning

confidence: 99%

On the mechanical behaviour of a low-angle normal fault: the Alto Tiberina fault (Northern Apennines, Italy) system case study

et al. 2016

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“…Such a geometry is also characteristic of the northwestern Gubbio normal fault, which also belongs to the UFS (Mirabella et al, 2004).…”

Section: Tectonic Settingmentioning

confidence: 91%

“…In fact, good-quality seismic reflection profiles northwest of the study area show that another segment of the UFS (the Gubbio fault; see location in Figure 1) reactivates a preexisting thrust at depth and that its final shape is listric (Mirabella et al, 2004). Other Quaternary normal faults in central Italy, similar to the Gubbio normal fault, have reactivated preexisting normal faults (Calamita et al, 1998;Tavarnelli, 1999;Pizzi and Scisciani, 2000;Pizzi et al, 2002).…”

Section: Tectonic Settingmentioning

confidence: 97%

“…This data set, made available only recently, provides an independent data source for the geometric reconstruction of the subsurface geologic structures. In particular, it allows for the geometric reconstruction of currently active faults (Boncio et al, 1998;Pauselli et al, 2002;Collettini et al, 2003;Mirabella et al, 2004), which can be compared with the main shock and aftershock distribution. Moreover, the CROP03 seismic reflection profile acquired in the Italian deep-crust exploration project is also available; it has shown interpretable seismic data down to tens of kilometers Pialli et al, 1998).…”

Section: Available Seismic Datamentioning

confidence: 99%

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Comparison between reprocessed seismic profiles: Seismologic and geologic data — A case study of the Colfiorito earthquake area

2006

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Seismic reflection data are used to reconstruct the subsurface geologic structures below the Umbria-Marche region in Italy, a highly seismogenic area with a recent history of seismic activity (the 1997-1998 Colfiorito sequence). We reprocess three vibroseis seismic profiles (acquired in the early 1980s for hydrocarbon exploration) whose stacked sections were optimized for relatively deep oil targets. On the reprocessed seismic profile closest to the epicentral area, we construct the main reflectors to a depth of about 4 s (two-way time) and compare this interpretation with the available hypocenters of the 1997 earthquakes.The improvements in visualizing the shallow and deep reflections provide a better correlation between the reflectors and the observed surface structures as well as a better delineation of the basement-rock geometry. We find that part of the Colfiorito sequence is localized around some of the reflectors in the reflection profile, which we interpret as related to the active normal faults that outcrop at the surface.

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“…1). The basin was formed by a 120 • -150 • striking, 50 • -70 • dipping normal fault, whose plane emerges on the western edge of the depression that lowered the SW flank of a calcareous anticline (Collettini et al 2003, Mirabella et al 2004. The calcareous formation of the Umbria-Marche sequence and a flysch sequence, the "Formazione Marnoso-Arenacea", outcrop in the eastern and western side of the basin, respectively.…”

Section: Geological Settingmentioning

confidence: 99%

Characteristics of strong ground motion data recorded in the Gubbio sedimentary basin (Central Italy)

Pacor

Bindi

Luzi

et al. 2006

Bull Earthquake Eng

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Various authors, analysing the set of accelerograms recorded at Gubbio Piana (GBP) (central Italy), have demonstrated that strong amplification occurs at this accelerometric station, which is installed within an alluvial basin. In particular, Ambraseys et al. [(2005a), Bull Earthq Eng 3:1-53; (2005b), Bull Earth Eng 3:55-73] observed that the strong motion peaks at GBP greatly exceed the median values predicted by the attenuation relationships they derived for Europe. In this work, we analyse and discuss some characteristics of the ground motion recorded at the GBP station. We show that the ground motion parameters, such as peak-ground acceleration and peak-ground velocity, are strongly influenced by the presence of locally induced surface waves that produce both a lengthening of the significant shaking duration and an increase in the peak values with respect to a nearby bedrock site. The basin-induced surface waves are observed in the three components of motion and their effects on the peak values are particularly evident in the vertical component. In the frequency domain, the energy of the surface waves is mostly restricted to the frequency band 0.4-0.8 Hz for both the horizontal and vertical components. The horizontal and vertical Fourier amplitudes are also very similar, and this indicates that the H/V spectral ratio technique is not applicable to describing the site response due to the propagation of seismic wave in a complex 2D/3D geological structure. Finally, a preliminary polarization analysis shows that the directions of polarization, as well Bull Earthquake Eng (2007) 5:27-43 as the degree of elliptical polarization, exhibit a strong variability with time, that may be related to a complex propagation of Love and Rayleigh waves within the basin.

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The Gubbio normal fault (Central Italy): geometry, displacement distribution and tectonic evolution

Cited by 73 publications

References 40 publications

On the mechanical behaviour of a low-angle normal fault: the Alto Tiberina fault (Northern Apennines, Italy) system case study

On the mechanical behaviour of a low-angle normal fault: the Alto Tiberina fault (Northern Apennines, Italy) system case study

Comparison between reprocessed seismic profiles: Seismologic and geologic data — A case study of the Colfiorito earthquake area

Characteristics of strong ground motion data recorded in the Gubbio sedimentary basin (Central Italy)

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