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  • Etna  (2)
  • 04. Solid Earth::04.03. Geodesy::04.03.01. Crustal deformations  (1)
  • Blackwell Publishing Ltd  (2)
  • Alfred Wegener Institute for Polar and Marine Research & German Society of Polar Research
  • Istituto Nazionale di Geofisica e Vulcanologia, Sezione di Catania, Osservatorio Etneo
  • 2010-2014  (3)
  • 1950-1954
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Year
  • 1
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    Unknown
    Strain and stress fields in the Southern Apennines (Italy) constrained by geodetic, seismological and borehole data (2012)
    Blackwell Publishing Ltd
    Details
    Publication Date: 2017-04-04
    Description: We present an improved evaluation of the current strain and stress fields in 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 9 years of GPS observations (2001-2010) from a dense network of permanent stations, a dataset 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 geologic 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 which 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.
    Description: Published
    Description: 1270-1282
    Description: 3.2. Tettonica attiva
    Description: JCR Journal
    Description: restricted
    Keywords: Satellite geodesy ; Plate motions ; Neotectonics ; Europe ; Apennines ; 04. Solid Earth::04.03. Geodesy::04.03.01. Crustal deformations
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: article
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    PAPER (OA)
  • 2
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    Unknown
    Magma intrusion mechanisms and redistribution of seismogenic stress at Mt. Etna volcano (1997–1998) (2012)
    Blackwell Publishing Ltd
    Details
    Publication Date: 2017-04-04
    Description: Several volcanoes worldwide have shown changes in their stress state as a consequence of the deformation produced by the pressurization of a magmatic body. This study investigates seismic swarms occurring on the western flank of Mt. Etna in January 1997 - January 1998. Integrating seismic observations and geodetic data, we constrained the seismogenic fault system, and on the basis of stress tensor inversion and SHMAX analyses, we infer an inflating pressure source located at 5.5 km b.s.l. beneath the west portion of summit area. Evaluation of Coulomb failure stress (CFS) related to the proposed model, showed how a large part of the seismogenic fault underwent a significant CFS increase (500 kPa). We infer the presence of a sub-vertical faulted region, potentially weak, N50°E oriented beneath the western sector of Mt. Etna. This structure could be brought closer to failure thereby generating seismic swarms as the effect of elastic stress transfer induced by movement and/or overpressure of magmatic masses within the upper crust under the volcano.
    Description: This research was funded by the INGV–DPC 2007–2009 Agreement (Project V4_Flank).
    Description: Published
    Description: 339-348
    Description: 1.4. TTC - Sorveglianza sismologica delle aree vulcaniche attive
    Description: JCR Journal
    Description: restricted
    Keywords: Etna ; modelling ; Seismicity ; GPS monitoring ; 04. Solid Earth::04.08. Volcanology::04.08.06. Volcano monitoring
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: article
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  • 3
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    Unknown
    Dynamics of the upper SE flank of Mt. Etna: a synoptic view from the characteristics of the seismic signals between November 2005 and January 2006 (2012)
    Istituto Nazionale di Geofisica e Vulcanologia, Sezione di Catania, Osservatorio Etneo
    Details
    Publication Date: 2017-04-04
    Description: Dynamics of the upper SE flank of Mt. Etna: a synoptic view from the characteristics of the seismic signals between November 2005 and January 2006 Falsaperla, S., G. Barberi, O. Cocina Istituto Nazionale di Geofisica e Vulcanologia, Sezione di Catania, Osservatorio Etneo,P.zza Roma 2, 95125, Catania, Italy The July – December 2006 eruptive activity at Mt. Etna was preceded by changes in volcanic tremor characteristics. The amplitude of volcanic tremor peaked in December 2005 after a restless, even though slow increase, starting from July 2005, during which no visible change was reported in the visible activity of the volcano by volcanologists and alpine guides. In this study we focus on a three-month long time period, i.e., from November 1 2005 to January 31 2006, which was characterized by strong changes in amplitude and frequency content of volcanic tremor. In so doing, we analyze records from permanent stations run by INGV as well as a few broadband seismic sensors of a temporary array, deployed from July 2005 to January 2006. Pattern classification analysis based on Self Organizing Maps and Fuzzy Cluster Analysis highlights variations in volcanic tremor data we interpret as evidence for magma ascent, representing a stage of recharging of the volcanic feeder at depth. This hypothesis is supported by VT seismicity, which was intense in the time span investigated. In particular, earthquakes recorded on January 8, 2006 (with foci between 10 and 15 km) were the major indicators to sketch out the modality of transfer of magma within the volcano during this recharging phase [Cocina et al., Geophysical Research Abstracts, Vol. 12, EGU2010-9267, 2010]. Finally, differences in the characteristics of the seismic signal at reference stations are also analyzed in the light of a recently published seismic tomography [Patanè et al., Science, Vol. 313, 821-823, 2006].
    Description: Published
    Description: Salina, Italy
    Description: 1.4. TTC - Sorveglianza sismologica delle aree vulcaniche attive
    Description: open
    Keywords: Etna ; seismic signals ; pattern classification ; tomography ; 04. Solid Earth::04.06. Seismology::04.06.08. Volcano seismology
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: Oral presentation
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