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  • 2005-2009  (76)
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  • 1
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    In:  Tectonics, Kunming, China, Geological Society, vol. 25, no. 4, pp. 1-21, pp. TC4015, (ISBN 1-86239-117-3)
    Publication Date: 2006
    Keywords: Modelling ; Laboratory measurements ; Italy ; Tectonics ; Plate tectonics ; Seismicity ; 7230 ; Seismology: ; Seismicity ; and ; tectonics ; 8010 ; Structural ; Geology: ; Fractures ; and ; faults ; 8011 ; Structural ; Geology: ; Kinematics ; of ; crustal ; and ; mantle ; deformation ; 8111 ; Tectonophysics: ; Continental ; tectonics: ; strike-slip ; and ; transform ; 8123 ; Tectonophysics: ; Dynamics: ; seismotectonics ; Bucci
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  • 2
  • 3
    Publication Date: 2007-06-01
    Description: We revisited data related to the 1456 seismic crisis, the largest earthquake to have ever occurred in peninsular Italy, in search of its causative source(s). Data about this earthquake consist solely of historical reports and their intensity assessment. Because of the age of this multiple earthquake, the scarcity and sparseness of the data, and the unusually large damage area, no previous studies have attempted to attribute the 1456 events to specific faults. Existing analytical methods to identify a likely source from intensity data also proved inappropriate for such a sparse dataset, since historical evidence suggests that the cumulative damage pattern contains at least three widely separated events. We subdivided the 1456 damage pattern into three independent mesoseismal areas; each of these areas falls onto east-west tectonic trends previously identified and marked by deep (〉10 km) right-lateral slip earthquakes. Based on this evidence we propose (1) that the 1456 events were generated by individual segments of regional east-west structures and are evidence of a seismogenic style that involves oblique dextral reactivation of east-west lower crustal faults; (2) that each event may have triggered subsequent but relatively distant events in a cascade fashion, as suggested by historical accounts; hence (3) that the 1456 sequence reveals a fundamental but unexplored mechanism of tectonic deformation and seismic release in southern Italy. This style dominates the region that lies between the northwest-southeast system of large extensional faults straddling the crest of the southern Apennines and the buried outer front of the chain. Although the quality of the available information concerning the 1456 earthquake is naturally limited, we show that the overlap of the damage distribution, the orientation and characteristics of regional tectonic structures, the seismicity patterns, and the focal mechanisms all concur with our interpretations and would be difficult to justify otherwise.
    Print ISSN: 0037-1106
    Electronic ISSN: 1943-3573
    Topics: Geosciences , Physics
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  • 4
    Publication Date: 2008-02-01
    Description: On 16 December 1857, a strong earthquake (M approximately 7) struck a large portion of the southern Apennines about 150 km southeast of Naples. The earthquake was thoroughly investigated by Irish engineer Robert Mallet, who wrote an extensive report that is still regarded as a landmark in observational seismology. Because of the concentration of damage in the High Agri valley, and contrary to Mallet's own findings, for many years the earthquake was referred to as the "Val d'Agri earthquake" and was believed by most investigators to have ruptured the 20-25-km normal fault lying beneath this intermontane basin. The magnitude of the earthquake, however, and evidence for earthquake complexity suggest that the true rupture length has been so far underestimated. We contend that the 1857 earthquake ruptured in a cascade fashion two adjacent and relatively well-known faults: first the smaller Melandro-Pergola fault, commonly believed to represent a seismic gap between the causative faults of the 1857 and of the 1980 Irpinia (M (sub w) 6.9) earthquakes; and then the larger Agri valley fault proper. Contemporary chronicles reported a time lapse of 2-3 min between the two ruptures, thus effectively making them two independent shocks. The rupture must have proceeded unilaterally from the northwestern edge of the Melandro-Pergola fault, where Mallet placed the earthquake epicenter, thus explaining the concentration of damage--and attention by rescue crews and subsequent investigators--in the southeastern portion of the High Agri valley.
    Print ISSN: 0037-1106
    Electronic ISSN: 1943-3573
    Topics: Geosciences , Physics
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  • 5
    Publication Date: 2009-10-01
    Print ISSN: 0954-4879
    Electronic ISSN: 1365-3121
    Topics: Geosciences
    Published by Wiley
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  • 6
    Publication Date: 2009-03-01
    Print ISSN: 0895-0695
    Electronic ISSN: 1938-2057
    Topics: Geosciences
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  • 7
    Publication Date: 2021-01-05
    Description: Destructive earthquakes are rare in France yet pose a sizable seismic hazard, especially when critical infrastructures are concerned. Only a few destructive events have occurred within the instrumental period, the most important being the 11 June 1909, Lambesc (Provence) earthquake. With a magnitude estimated at 6.2 [Rothé, 1942], the event was recorded by 30 observatories and produced intensity IX effects in the epicentral area, ~30 km north of Marseille. We collected 30 seismograms, leveling data and earthquake intensities to assess the magnitude and possibly the focal mechanism of this event. Following this multidisciplinary approach, we propose a source model where all relevant parameters are constrained by at least two of the input datasets. Our reappraisal of the seismological data yielded Mw 5.8-6.1 (6.0 preferred) and Ms 6.0, consistent with the magnitude from intensity data (Me 5.8) and with constraints derived from modeling of coseismic elevation changes. Hence, we found the Lambesc earthquake to have been somewhat smaller than previously reported. Our datasets also constrain the geometry and kinematics of faulting, suggesting that the earthquake was generated by reverse-right lateral slip on a WNW-striking, steeply north-dipping fault beneath the western part of the Trévaresse fold. This result suggests that the fold, located in front of the Lubéron thrust, plays a significant role in the region’s recent tectonic evolution. The sense of slip obtained for the 1909 rupture also agrees with the regional stress field obtained from earthquake focal mechanisms and microtectonic data as well as recent GPS data.
    Description: Published
    Description: 2454
    Description: partially_open
    Keywords: Lambesc earthquake ; France ; historical seismograms ; displacement modeling ; macroseismic data ; geodetic data ; 04. Solid Earth::04.03. Geodesy::04.03.01. Crustal deformations ; 04. Solid Earth::04.06. Seismology::04.06.01. Earthquake faults: properties and evolution ; 04. Solid Earth::04.06. Seismology::04.06.05. Historical seismology ; 04. Solid Earth::04.06. Seismology::04.06.09. Waves and wave analysis
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: article
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    Format: 4419432 bytes
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  • 8
    Publication Date: 2012-02-03
    Description: The outermost, NE-verging fronts of the Northern Apennines (Italy) are overlain by a thick syntectonic sedimentary wedge filling up the basin beneath the Po Plain. Due to fast sedimentation rates and comparatively low tectonic rates, the fronts are generally buried. Evidence for their activity includes scattered historical and instrumental earthquakes and drainage anomalies controlled by growing buried anticlines. The largest earthquakes, up to Mw 5.8, are associated with active compression with a GPS-documented shortening rate 〈1 mm/a. We used geological, structural and morphotectonic data to draw a N-S–striking section between Bologna and Ferrara, aimed at analyzing whether and how the deformation is partitioned among the frontal thrusts of the Northern Apennines and identifying the potential sources of damaging earthquakes. We pointed out active anticlines based on the correspondence among drainage anomalies, historical seismicity and buried ramps. We also analyzed the evolution of the Plio-Quaternary deformation by modeling in a sandbox the geometry, kinematics and growth patterns of the thrust fronts. Our results (i) confirm that some of the main Quaternary thrusts are still active and (ii) highlight the partitioning of deformation in the overlap zones. We remark that the extent and location of some of the active thrusts are compatible with the location and size of the main historical earthquakes and discuss the hypothesis that they may correspond to their causative seismogenic faults.
    Description: In press
    Description: 3.2. Tettonica attiva
    Description: JCR Journal
    Description: open
    Keywords: Fold-and-thrust belt ; active tectonics ; seismogenic sources ; Po Plain ; 04. Solid Earth::04.04. Geology::04.04.01. Earthquake geology and paleoseismology ; 04. Solid Earth::04.04. Geology::04.04.03. Geomorphology ; 04. Solid Earth::04.04. Geology::04.04.09. Structural geology
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: article
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  • 9
    Publication Date: 2017-04-04
    Description: This deliverable is subdivided into two parts. Part 1 presents a summary of methodologies employed in the investigation of slow active faults in the Po Plain. The methodologies are briefly described with the support of images taken from reports and papers partially or totally developed within SAFE. Part 2 presents a summary of results and parameters obtained for Po Plain faults/seismogenic sources. The reader should be aware that these results are described in detail in Deliverable 8.2 “Detailed characterisation of individual structures” within WP8 “Modelling of topographic signal”. This is due to the fact that the Po Plain is dominated by blind faulting and that most of the methodologies developed to investigate this region are based on observations and analyses of the topography and lanscape. The source parameters are described with reference to the GIS-based database of potential earthquake sources developed within SAFE by INGV. This database, that was largely modelled and formatted according to the criteria set forth by the EC project “Faust” (Valensise et al., 2002), is fully described and supplied in electronic form as Deliverable 8.1 “GIS-based database of potential earthquake sources identified in suitable key-areas”. Finally, recall that individual seismogenic sources are defined as in Valensise and Pantosti (2001).
    Description: Istituto Nazionale di Geofisica e Vulcanologia European Commission Research Directorates General Shared Cost
    Description: Published
    Description: open
    Keywords: slow active faults ; 04. Solid Earth::04.06. Seismology::04.06.01. Earthquake faults: properties and evolution
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: report
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  • 10
    Publication Date: 2017-04-04
    Description: The DISS (extensively described elsewhere in this session: also available at http://www.ingv.it/DISS/) is a large and fully georeferenced repository of tectonic, fault and paleoseismological information on Italy. The new version 3.0.2 contains over 120 “Individual Seismogenic Sources”, over 75 “Seismogenic Areas”, over 300 “Macroseismic Seismogenic Sources”, all complemented by over 700 images, about 2,000 references and a number of maps and datasets regarding widely diverse geophysical datasets. The data analysis tools supplied by DISS’ GIS engine allow the user to select, overlay and process several types of data and to perform spatial and statistical analyses. For all of these reasons DISS is not simply an archive of outcrop-scale field data, but rather a precious tool that allows the seismogenic process to be represented and investigated in 3D and at various scales, and particularly at regional scale. One of the key points in the design of the structure of the Dabatase was the full exploitation of basic physical constraints concerning the rates of crustal deformation, the continuity of deformation belts, the spatial relationships between adjacent faults, both at the surface and at depth.
    Description: INGV
    Description: Unpublished
    Description: Vienna
    Description: open
    Keywords: Database ; Seismogenic Areas ; Seismogenic Sources ; 04. Solid Earth::04.04. Geology::04.04.01. Earthquake geology and paleoseismology
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: Poster session
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