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  • doppiavoce  (3)
  • AGU, Eos, Vol. 90, Number 52, 29 December 2009, Fall Meet. Suppl., Abstract V23D-2119  (1)
  • Geophysical Research Abstracts Vol. 18, EGU2016-5727-2, 2016  (1)
  • 1
    Publikationsdatum: 2017-04-04
    Beschreibung: A system for automatic recognition of different volcanic activity regimes based on supervised classification of volcanic tremor is proposed. Spectrograms are calculated from volcanic tremor time-series, separated into four classes, each assumed as representative of a different state of volcanic activity, i.e., pre-eruptive, eruptive, lava fountains, and post-eruptive. As classification features, the spectral profiles obtained by averaging each spectrogram along its rows are chosen. As supervised classification strategy, the Support Vector Machine (SVM) classifier is adopted. Evaluation of the system performance is carried out on volcanic tremor data recorded at Mt Etna during the eruptive episodes of July-August 2001. The leave-one-out classification accuracy achieved is of about 94%.
    Beschreibung: Published
    Beschreibung: 67-75
    Beschreibung: 1.4. TTC - Sorveglianza sismologica delle aree vulcaniche attive
    Beschreibung: open
    Schlagwort(e): Support Vector Machine ; automatic classification ; volcanic tremor ; Etna ; 04. Solid Earth::04.06. Seismology::04.06.08. Volcano seismology
    Repository-Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Materialart: book chapter
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
  • 2
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    AGU, Eos, Vol. 90, Number 52, 29 December 2009, Fall Meet. Suppl., Abstract V23D-2119
    Publikationsdatum: 2017-04-04
    Beschreibung: Mt Etna is a well monitored basaltic volcano for which high-quality, multidisciplinary data set are continuously available for around-the-clock surveillance. Particularly, volcano-seismic data sets cover decades long local recordings, temporally encompassing different styles of eruptive activity, from Strombolian eruptions to lava fountains and lava flows. Intense earthquakes swarms have often heralded effusive activity. However, from the seismic point of view, volcanic tremor has proved to be one of the most reliable indicators of impending eruptive activity. Indeed, changes in the volcano feeder show up in the signature of tremor, its spectral characteristics and source location. Some of us (Langer and Messina) have recently developed a new software for the classification of volcanic tremor data, combining Self Organizing Maps (also known as Kohonen Maps) along with Cluster and Fuzzy Analysis. This software allows us to analyse the background seismic radiation at permanent broadband stations located at various distance from the summit craters to identify transitions from pre-eruptive to eruptive activity. Throughout the analysis of the data flow, the software provides an unsupervised classification of the spectral characteristics (i.e., amplitude and frequency content) of the signal. The information embedded in the spectrum is interpreted to assign a specific state of the volcano. An application of this new software is proposed here on the eruptive events at Etna of 2007-2009, which consisted of 7 episodes of lava fountaining, periodic Strombolian activity at the summit craters, followed by lava emissions on the upper east flank of the volcano, with start on 13 May 2008 and end on 6 July 2009. In the study period the source of volcanic tremor was always shallow (less than 3 km) and within the volcano edifice. The upraise of magma to the surface was fast and associated with changes of volcanic tremor features, which covered time windows of variable duration from several hours to a few minutes. We discuss the possible reasons of such variability in the light of the characteristics of the overall seismicity preceding the eruptions in the study period, taking into account field observations and rheology of the ascending magma as well.
    Beschreibung: Published
    Beschreibung: San Francisco, California, USA
    Beschreibung: 1.4. TTC - Sorveglianza sismologica delle aree vulcaniche attive
    Beschreibung: open
    Schlagwort(e): Volcanic activity ; volcanic tremor analysis ; 04. Solid Earth::04.06. Seismology::04.06.08. Volcano seismology
    Repository-Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Materialart: Poster session
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
  • 3
    Publikationsdatum: 2017-04-04
    Beschreibung: By 30 December, 2002 a flank collapse affected the Sciara del Fuoco on the western slope of Stromboli volcano, Italy. To characterize this landslide-prone area for hazard mitigation purposes, Falsaperla et al. [2006] followed a multidisciplinary approach, merging geo-structural observations with visual images (taken by a video-camera surveillance network and vertical ortho-photos) and seismic data recorded throughout the continuous monitoring of the volcano. The study combined these different data types in a complementary framework to assess how and where the Sciara del Fuoco morphology changed. The time span investigated ranged from 2002 to 2004. We present here the results of that study, which identified the zones affected by sliding episodes and highlighted their changes in time. The evidence of the regression of the upper landslide scarp toward the summit craters over the years leads us to speculate about precursory patterns of eruptive activity linked to the progression of flank instability.
    Beschreibung: Published
    Beschreibung: 57-65
    Beschreibung: open
    Schlagwort(e): Stromboli ; flank instability ; seismic monitoring ; visual monitoring ; 04. Solid Earth::04.06. Seismology::04.06.06. Surveys, measurements, and monitoring
    Repository-Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Materialart: book chapter
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
  • 4
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    doppiavoce
    Publikationsdatum: 2017-04-04
    Beschreibung: A 3D grid search method for the location of the volcanic tremor source was applied to data recorded at Mt. Etna in 2004 [Di Grazia et al., 2006]. The aim of that application was to highlight changes in time and space of the location of the tremor source, heralding the onset of a lava emission on 7 September, 2004. The time span investigated ranged from January to November 2004. The method exploits the amplitude decay of the seismic signal recorded at permanent stations used for monitoring purposes. Consequently, it does not require any additional set up of temporary, mobile stations. We present here the results of that application, which was followed in the autumn of 2006 by the successful implementation of the method we named TREMLOC, as an automated and continuous near real time analysis for the location of volcanic tremor at the Istituto Nazionale di Geofisica e Vulcanologia (INGV) - Sezione di Catania.
    Beschreibung: Published
    Beschreibung: 49-56
    Beschreibung: 1.4. TTC - Sorveglianza sismologica delle aree vulcaniche attive
    Beschreibung: open
    Schlagwort(e): Etna ; volcanic tremor ; monitoring ; source location ; 04. Solid Earth::04.06. Seismology::04.06.08. Volcano seismology
    Repository-Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Materialart: book chapter
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
  • 5
    Publikationsdatum: 2021-11-29
    Beschreibung: Damage of non-structural elements of buildings (i.e. partitions, ceilings, cladding, electrical and mechanical sys- tems and furniture) is known to cause injuries and human losses. Also it has a significant impact on earthquake resilience and is yet being worldwide underestimated. The project KnowRISK (Know your city, Reduce seISmic risK through non-structural elements) is financed by the European Commission to develop prevention measures that may reduce non-structural damage in urban areas. Pilot areas of the project are within the three European participating countries, namely Portugal, Iceland and Italy. They were chosen because they are prone to damage level 2 and 3 (EMS-98, European Macroseismic Scale) that typically affects non-structural elements. We will develop and test a risk communication strategy taking into ac- count the needs of households and schools, putting into practice a portfolio of best practice to reduce the most common non-structural vulnerabilities. Wewilltargetouractionstodifferentsocietalgroups,consideringtheirculturalbackgroundandsocialvulnerabil- ities, and implement a participatory approach that will promote engagement and interaction between the scientific community, practitioners and citizens to foster knowledge on everyone’s own neighborhoods, resilience and vul- nerability. A Practical Guide for citizens will highlight that low-cost actions can be implemented to increase safety of house- holds,meantasbeingtheplaceswherethemostvulnerablesocietalgroups,includingchildrenandelderlypeople, spend much of their time. Since our actions towards communication will include education, we will define tools that allow a clear and direct understanding of elements exposed to risk. Schools will be one of our target societal groups and their central role played at the community level will ensure spreading and strengthening of the communication process. Schools are often located in old or re-adapted build- ings,formerlyusedforotheruses,orwhenthegrowingnumberofstudentsornewneedsrequireadaptingthespace to the necessities, often without taking enough care of safety. Moreover, in urban areas, schools may be hosted in tall buildings where the shaking of moderate-to-low magnitude earthquakes can cause damage level 2 and 3. Students will be involved into looking after their own situation in terms of non-structural vulnerability to promote education and prevention, while increasing resilience in terms of societal capacity to cope with future disasters. The actions will undergo specific effectiveness assessment with ex-ante and ex-post surveys. The results of this assessmentwillallowanevaluationofon-siteriskcommunicationactivities,thecomparabilitybetweenpilot-areas achievements, and an opportunity for learning and guidance for future risk communication.
    Beschreibung: Published
    Beschreibung: Vienna, Austria
    Beschreibung: 3T. Pericolosità sismica e contributo alla definizione del rischio
    Beschreibung: open
    Schlagwort(e): non-structural damage ; earthquakes ; seismic risk ; communication ; 04. Solid Earth::04.06. Seismology::04.06.11. Seismic risk
    Repository-Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Materialart: Poster session
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
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