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  • Mt. Etna
  • Open Access
  • Springer  (3)
  • American Chemical Society (ACS)
  • HTWK Leipzig - OA-Hochschulverlag
  • MDPI Publishing
  • Springer Nature
  • 1985-1989  (3)
Collection
Keywords
Publisher
  • Springer  (3)
  • American Chemical Society (ACS)
  • HTWK Leipzig - OA-Hochschulverlag
  • MDPI Publishing
  • Springer Nature
Years
Year
  • 1
    Electronic Resource
    Electronic Resource
    Review of seismological studies at Mount Etna (1987)
    Springer
    Pure and applied geophysics 125 (1987), S. 951-970 
    Details
    ISSN: 1420-9136
    Keywords: Mt. Etna ; earthquakes ; eruptions
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract This paper reports the present state of seismological research at Mt. Etna. A schematic classification of the earthquakes that occur on the volcano is proposed, based on both seismogram and spectrum features. We have made both focal solutions and estimates of earthquake source parameters (stress drop values between 2 and 20 bars and small source dimensions). The crust of Etna thus appears as an extremely heterogeneous medium that does not permit great stress accumulation. The coexistence of an extensional regime with an older and deeper compressive one seems confirmed at depths greater than about 7 km. Eruptive and seismic phenomena occur mainly along the principal structural trends of the volcano, but often the directions of the eruptive fractures and the earthquake concentration during the same eruption do not coincide. Tectonics seem to play an important role in controlling seismo-volcanic behaviour.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00879362
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Volcanic tremor at Mt. Etna: State-of-the-art and perspectives (1987)
    Springer
    Pure and applied geophysics 125 (1987), S. 1079-1095 
    Details
    ISSN: 1420-9136
    Keywords: Mt. Etna ; volcanic tremor ; eruptive precursors
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract Volcanic tremor on Etna seems to have its origin within the main magma feeding system. On the basis of both spectral analyses at two permanent seismic stations and periodical measurements along the slopes of the volcano, two distinct sources are proposed. The former, characterized by low frequency contents (f〈1.5 Hz), is located in a 2 km deep flat magma chamber, whereas the latter source seems to be linked to the upper part of the active vents. Turbulent motions in the magma-gas mixture, induced by escaping gases within the conduits, is one proposed cause of volcanic tremor on Etna (Seidl et al., 1981). From spectral analyses we propose approximate models of the feeding system of the main summit craters. Time variations of tremor energy were also investigated, and no regular patterns have been observed for the studied eruptions. More systematic information seems to be needed for a better knowledge of both the source model and location, and correlation between tremor features and volcanic activity.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00879369
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Statistical analysis of earthquake activity at Etna volcano (March 1981 eruption) (1985)
    Springer
    Pure and applied geophysics 123 (1985), S. 697-705 
    Details
    ISSN: 1420-9136
    Keywords: Volcanic earthquakes ; statistical analysis ; Mt. Etna
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract Seismic activity that preceded, accompanied, and followed the 17–23 March 1981 Etnean eruption has been statistically analyzed. On the grounds of both time evolution of seismicity and catalogue completeness, three time intervals have been defined (12 February–2 March, 12–17 March, 19–31 March) and for each of these periods both the “b” coefficient of theGutenberg-Richter's (1956) relationship and the “E” parameter of the cluster size (Shlien andToksoz, 1970) have been calculated. No significant variations were observed between the first and third periods, while lower values of bothb andE coefficients were found in the second one. These findings might indicate that changes in the seismicity features occur just before the eruption start. Small but fast variations in the stress field acting on the volcano might originate this type of seismic activity, while the importance of the tectonic control on volcanic phenomena seems to be confirmed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00878403
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