Effects of the hydrothermal circulation on the strain field of the Campanian Plain (southern Italy)

Milano, Girolamo; Petrazzuoli, S.M.; Ventura, Guido

doi:10.1111/j.1365-3121.2004.00556.x

Cited by 12 publications

(4 citation statements)

References 28 publications

(41 reference statements)

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“…Extensive interdisciplinary literature supports the claim that NW-SE and WNW-ESE oriented tectonic structures may also drive more recent unrests at Campi Flegrei. These include earthquakes occurring along a ~NW-SE preferred strike 45 , 46 and normal NW-SE faults moving in response to a NNE-SSW to NE-SW extension 47 . The two paired deformation sources 11 were active after 1984, until 2010.…”

Section: Resultsmentioning

confidence: 99%

Source and dynamics of a volcanic caldera unrest: Campi Flegrei, 1983–84

Siena

Chiodini

Vilardo

et al. 2017

Sci Rep

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Despite their importance for eruption forecasting the causes of seismic rupture processes during caldera unrest are still poorly reconstructed from seismic images. Seismic source locations and waveform attenuation analyses of earthquakes in the Campi Flegrei area (Southern Italy) during the 1983–1984 unrest have revealed a 4–4.5 km deep NW-SE striking aseismic zone of high attenuation offshore Pozzuoli. The lateral features and the principal axis of the attenuation anomaly correspond to the main source of ground uplift during the unrest. Seismic swarms correlate in space and time with fluid injections from a deep hot source, inferred to represent geochemical and temperature variations at Solfatara. These swarms struck a high-attenuation 3–4 km deep reservoir of supercritical fluids under Pozzuoli and migrated towards a shallower aseismic deformation source under Solfatara. The reservoir became aseismic for two months just after the main seismic swarm (April 1, 1984) due to a SE-to-NW directed input from the high-attenuation domain, possibly a dyke emplacement. The unrest ended after fluids migrated from Pozzuoli to the location of the last caldera eruption (Mt. Nuovo, 1538 AD). The results show that the high attenuation domain controls the largest monitored seismic, deformation, and geochemical unrest at the caldera.

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Section: Resultsmentioning

confidence: 99%

Source and dynamics of a volcanic caldera unrest: Campi Flegrei, 1983–84

Siena

Chiodini

Vilardo

et al. 2017

Sci Rep

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“…For each focal mechanism the date, the depth and the magnitude are reported. The star near the date indicates that the focal mechanisms are taken by Milano et al. (2004); (b) hypocentral distribution of the seismicity enclose in the rectangular area of (a) on WSW–ENE (A–A′)‐oriented cross‐section (A: 40.6563N, 13.9502E; A′: 41.4061N, 16.0638E.…”

Section: Discussionmentioning

confidence: 99%

“…To achieve accurate hypocentre locations, we performed accurate re-picking on digital waveforms of the seismic events with at least six P and four S phases. Seismic events have been relocated by means of the standard HYPO71 algorithm (Lee and Lahr, 1975), using the 1D velocity model adopted in Milano et al (2004). The epicentral distribution of the relocated earthquakes with magnitude greater than 2.0 is shown in Fig.…”

Section: Seismic Datamentioning

confidence: 99%

Rheological behaviour of the crust in Southern Apennine (Italy): results from a thermal and seismological study

Solaro¹,

Tizzani²,

Milano³

et al. 2007

Terra Nova

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To add information on the brittle/ductile transition of the Southern Apennine, we investigated a rheological profile of the crust along a WSW–ENE‐oriented cross‐section running from Neapolitan Volcanic Zone to Apulia foreland. The rheological model was obtained computing a thermal modelling and constrained by a relocalization of earthquakes of the area. Results show that the area is characterized by horizontal rheological variations, with two horizons interlayered with ductile horizons, that are quite predominant with respect to vertical ones. The horizontal stratification of lithospheric rheology has important geodynamic consequence and could provide new insights to better understand the tectonic processes which have played a major role to construct the Southern Apennine belt. Results of this study suggested that well‐constrained rheological models, built integrating information from both relocated earthquakes and thermal state, could give important hints on the mechanical behaviour of the crust and its related tectonic processes.

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“…In the west, within the Campania Plain, extension was locally accompanied by volcanism, whose emplacement was controlled by the intersecting networks of high‐angle faults (e.g. Orsi et al 1996; Di Vito et al 1999; De Vivo et al 2001; Milia et al 2003; Milano et al 2004).…”

Section: Background Settingmentioning

confidence: 99%

Strain and stress fields in the Southern Apennines (Italy) constrained by geodetic, seismological and borehole data

Palano¹,

Cannavò²,

Ferranti³

et al. 2011

Geophysical Journal International

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S U M M A R YWe present an improved evaluation of the current strain and stress fields in the Southern Apennines (Italy) obtained through a careful analysis of geodetic, seismological and borehole data. In particular, our analysis provides an updated comparison between the accrued strain recorded by geodetic data, and the strain released by seismic activity in a region hit by destructive historical earthquakes. To this end, we have used nine years of GPS observations (2001-2010) from a dense network of permanent stations, a data set of 73 well-constrained stress indicators (borehole breakouts and focal mechanisms of moderate-to-large earthquakes) and published estimations of the geological strain accommodated by active faults in the region. Although geodetic data are generally consistent with seismic and geological information, previously unknown features of the current deformation in southern Italy emerge from this analysis. The newly obtained GPS velocity field supports the well-established notion of a dominant NE-SW-oriented extension concentrated in a ∼50-km-wide belt along the topographic relief of the Apennines, as outlined by the distribution of seismogenic normal faults. Geodetic deformation is, however, non-uniform along the belt, with two patches of higher strain-rate and shear-stress accumulation in the north (Matese Mountains) and in the south (Irpinia area). Low geodetic strain-rates are found in the Bradano basin and Apulia plateau to the east. Along the Ionian Sea margin of southern Italy, in southern Apulia and eastern Basilicata and Calabria, geodetic velocities indicate NW-SE extension that is consistent with active shallow-crustal gravitational motion documented by geological studies. In the west, along the Tyrrhenian margin of the Campania region, the tectonic geodetic field is disturbed by volcanic processes. Comparison between the magnitude of the geodetic and the seismic strain rates (computed using a long historical seismicity catalogue) allow detecting areas of high correlation, particularly along the axis of the mountain chain, indicating that most of the geodetic strain is released by earthquakes. This relation does not hold for the instrumental seismic catalogue, as a consequence of the limited time span covered by instrumental data. In other areas (e.g. Murge plateau in central Apulia), where seismicity is very low or absent, the yet appreciable geodetic deformation might be accommodated in aseismic mode. Overall, the excellent match between the stress and the strain-rate directions in much of the Apennines indicates that both earthquakes and ground deformation patterns are driven by the same crustal forces.

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Effects of the hydrothermal circulation on the strain field of the Campanian Plain (southern Italy)

Cited by 12 publications

References 28 publications

Source and dynamics of a volcanic caldera unrest: Campi Flegrei, 1983–84

Source and dynamics of a volcanic caldera unrest: Campi Flegrei, 1983–84

Rheological behaviour of the crust in Southern Apennine (Italy): results from a thermal and seismological study

Strain and stress fields in the Southern Apennines (Italy) constrained by geodetic, seismological and borehole data

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