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  • 1
    Electronic Resource
    Electronic Resource
    Seismic heterogeneity of Mt Etna: structure and activity (1991)
    Oxford, UK : Blackwell Publishing Ltd
    Geophysical journal international 105 (1991), S. 0 
    Details
    ISSN: 1365-246X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences
    Notes: A dense seismic array maintained temporarily for 7 weeks provides an approach to deducing the 3-D heterogeneity of the structure of the upper crust beneath Mt Etna volcano, Sicily, Italy, from the inversion of P- and S-wave arrivals of local earthquakes. Independent data from a different source-array geometry using waves generated by distant shots at sea confirm a main lateral variation. A high-velocity body underlies part of the volcano. Its contrast with the surrounding thick sedimentary pile and its location extending from the present summit to the southeast suggests that it may have been built by the development and migration of past eruptive centres followed by caldera collapse. Local low-velocity anomalies near its sharp western edge may be associated with presently active features. These are: an extension of the region of the central craters from sea level to greater depth and a zone at 6 km depth, of possible proximity of magmatic material to sediments connected both to the upper central system and to greater depths. The structure under the western flank appears as highly heterogeneous.During the recording period, a sustained lava eruption of the Southeast Crater stopped and was followed by explosive activity at the central craters and a series of destructive earthquakes on the lower eastern flank in October 1984. No continuous migration occurred between these phases but they might be related through their locations with respect to structural heterogeneity. Seismic activity changed from a swarm of events just beneath the summit at sea level to a few isolated, much stronger events a few kilometres deeper and towards the edge of the central high-velocity zone and eventually to destructive single earthquakes further away under the lower slopes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-246X.1991.tb03450.x
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  • 2
    Electronic Resource
    Electronic Resource
    Mechanisms of magma eruption and emplacement at Mt Etna between 1989 and 1992 (1993)
    [s.l.] : Nature Publishing Group
    Nature 361 (1993), S. 439-441 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] At a late stage during the explosive activity from the southeast crater (10 September-6 October 1989), two prominent fissures developed, one erupting to the northeast2 and the second, a non-erupting fissure, extending 7 km towards the south-southeast. Seismic3'4, soil gas emanations5, thermal ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/361439a0
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  • 3
    Electronic Resource
    Electronic Resource
    Upwards migration of seismic focii: A forerunner of the 1989 eruption of Mt Etna (Italy) (1993)
    Springer
    Bulletin of volcanology 55 (1993), S. 357-361 
    Details
    ISSN: 1432-0819
    Keywords: Mt. Etna ; seismic network ; eruption ; migration ; hypocenter ; S-wave ; forerunner
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract Data from a portable array of three-component digital stations, run at Mt Etna from 1988 to early 1990, highlight the seismic behaviour of the volcano before the 1989 eruption, one of the most significant in terms of energy of the last two decades. After a two-year period of weak and discotinuous seismicity, the depth of the seismically active volumes was observed to become shallower a few months before the volcanic event. The overall migration of the events, inferred by hypocentral locations and decreases of S-P time differences at two stations, agrees with other geophysical forerunners and allows further insights into the changes in the stress field leading to the eruption.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00301146
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