A low-angle normal fault in the Umbria region (Central Italy): a mechanical model for the related microseismicity

Collettini, Cristiano; Barchi, Massimiliano R.

doi:10.1016/s0040-1951(02)00441-9

Cited by 143 publications

(108 citation statements)

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“…Moresby seamount, Woodlark Basin; Floyd et al 2001); and the significance of fluids in fault zones and more generally in crustal rheology (Axen 1992;Manatschal 1999;Collettini & Barchi 2002;Hayman et al 2003;Collettini & Holdsworth 2004;Evans et al 2004;Scholz & Hanks 2004). Wills & Buck (1997) examined the possible role of stress-field rotation in the development of rooted detachment faults, and concluded that applied stresses are not in general sufficient to create low-angle normal faults that would propagate to the Earth's surface (cf.…”

Section: Discussionmentioning

confidence: 99%

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Observations from the Basin and Range Province (western United States) pertinent to the interpretation of regional detachment faults

Christie‐Blick

Anders

Wills

et al. 2007

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This paper summarizes the results of completed and ongoing research in three areas of the Basin and Range Province of the western United States that casts doubt on the interpretation of specific regional detachment faults and the large extensional strains with which such faults are commonly associated. Given that these examples were influential in the development of ideas about low-angle normal faults, and particularly in making the case for frictional slip at dips of appreciably less than the 308 lock-up angle for m 0.6 (where m is the coefficient of friction), we advocate a critical re-examination of interpreted detachments elsewhere in the Basin and Range Province and in other extensional and passive margin settings.The Sevier Desert 'detachment' of west-central Utah is reinterpreted as a Palaeogene unconformity that has been traced to depth west of the northern Sevier Desert basin along an unrelated seismic reflection (most probably a splay of the Cretaceous-age Pavant thrust). The absence of evidence in well cuttings and cores for either brittle deformation (above) or ductile deformation (below) is inconsistent with the existence of a fault with as much as 40 km of displacement. The Pavant thrust and the structurally higher Canyon Range thrust are erosionally truncated at the western margin of the southern Sevier Desert basin, and are not offset by the 'detachment' in the manner assumed by those inferring large extension across the basin.The Mormon Peak detachment of SE Nevada is reinterpreted as a series of slide blocks on the basis of detachment characteristics and spatially variable kinematic indicators that are more closely aligned with the modern dip direction than the inferred regional extension direction. A particularly distinctive feature of the detachment is a basal layer of up to several tens of centimetres of polymictic conglomerate that was demonstrably involved in the deformation, with clastic dykes of the same material extending for several metres into overlying rocks in a manner remarkably similar to that observed at rapidly emplaced slide blocks. The Castle Cliff detachment in the nearby Beaver Dam Mountains of SW Utah is similarly regarded as a surficial feature, as originally interpreted, and consistent with its conspicuous absence in seismic reflection profiles from the adjacent sedimentary basin.The middle Miocene Eagle Mountain Formation of eastern California, interpreted on the basis of facies evidence and distinctive clast provenance to have been moved tectonically more than 80 km ESE from a location close to the Jurassic-age Hunter Mountain batholith of the Cottonwood Mountains, is reinterpreted as having accumulated in a fluvial-lacustrine rather than alluvial fanlacustrine setting, with no bearing on either the amount or direction of tectonic transport. The conglomeratic rocks upon which the provenance argument was based are pervasively channelized, with erosional relief of less than 1 m to as much as 15 m, fining-upwards successions at the same scale and abundant trough ...

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Section: Discussionmentioning

confidence: 99%

“…Axen , 1999cf. Axen , 2004Scott & Lister 1992;Axen & Selverstone 1994;Wernicke 1995;Rietbrock et al 1996;Abers et al 1997;Westaway 1999;Sorel 2000;Collettini & Barchi 2002;Hayman et al 2003).…”

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Observations from the Basin and Range Province (western United States) pertinent to the interpretation of regional detachment faults

Christie‐Blick

Anders

Wills

et al. 2007

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“…12 Ma) compressional deformation (Belvedere-Vallocchia thrust-top basin; Cipollari and Cosentino, 1997;Fig. 15) and a late Pliocene-early Pleistocene synrift stage (Collettini and Barchi, 2002;Pucci et al, 2014), the time gap between compression and extension is much longer (~ 9 m.y. ).…”

Section: New Insights Into the Evolution Of The Apennine Postorogenicmentioning

confidence: 99%

“…As indicated by the high seismicity that characterizes the youngest fault planes in the central Apennine intermontane basins (Collettini and Barchi, 2002;Falcucci et al, 2011;Tallini et al, 2012;Storti et al, 2013;Gori et al, 2014;Pucci et al, 2014), the extensional deformation responsible for the creation of these basins is still active over the whole domain that was affected by the late Plioceneearly Pleistocene synrift extension (from the Tiberino Basin in the west to the Sulmona Basin in the east). In this scenario, the intermontane basins of the central Apennines record ~3 m.y.…”

Section: New Insights Into the Evolution Of The Apennine Postorogenicmentioning

confidence: 99%

New insights into the onset and evolution of the central Apennine extensional intermontane basins based on the tectonically active L’Aquila Basin (central Italy)

et al. 2017

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“…1). The ATF is oriented at high angle to the maximum vertical compressive stress, σ 1 , and is therefore severely misoriented within the active stress field (Collettini and Barchi, 2002). The ATF, as many other low-angle normal faults (LANF) around the world (Collettini et al, 2011), formed as a gently dipping structure and is characterised by a high and constant rate of microseismic activity (Chiaraluce et al, 2007).…”

Section: Introduction: Scientific Backgroundmentioning

confidence: 99%

The shallow boreholes at The AltotiBerina near fault Observatory (TABOO; northern Apennines of Italy)

et al. 2014

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Abstract.As part of an interdisciplinary research project, funded by the European Research Council and addressing the mechanics of weak faults, we drilled three 200-250 m-deep boreholes and installed an array of seismometers. The array augments TABOO (The AltotiBerina near fault ObservatOry), a scientific infrastructure managed by the Italian National Institute of Geophysics and Volcanology. The observatory, which consists of a geophysical network equipped with multi-sensor stations, is located in the northern Apennines (Italy) and monitors a large and active low-angle normal fault.The drilling operations started at the end of 2011 and were completed by July 2012. We instrumented the boreholes with three-component short-period (2 Hz) passive instruments at different depths. The seismometers are now fully operational and collecting waveforms characterised by a very high signal to noise ratio that is ideal for studying microearthquakes. The resulting increase in the detection capability of the seismic network will allow for a broader range of transients to be identified.

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A low-angle normal fault in the Umbria region (Central Italy): a mechanical model for the related microseismicity

Cited by 143 publications

References 50 publications

Observations from the Basin and Range Province (western United States) pertinent to the interpretation of regional detachment faults

Observations from the Basin and Range Province (western United States) pertinent to the interpretation of regional detachment faults

New insights into the onset and evolution of the central Apennine extensional intermontane basins based on the tectonically active L’Aquila Basin (central Italy)

The shallow boreholes at The AltotiBerina near fault Observatory (TABOO; northern Apennines of Italy)

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