期刊
INTERNATIONAL JOURNAL OF EARTH SCIENCES
卷 89, 期 3, 页码 665-677出版社
SPRINGER-VERLAG
DOI: 10.1007/s005310000117
关键词
tephrostratigraphy; tephrochronology; basaltic explosive eruptions; tephra marker beds; Y1 tephra layer; X4 tephra layer; Quaternary; Etna
The pyroclastic deposits of Etna have been correlated over the whole volcanic edifice for the first time, allowing the construction of a continuous record of tephra-producing events, which extends from approximately 100 ka to the Present. In this interval, five main periods of explosive activity have been identified: (a) similar to 100-ka strombolian to subplinian activity; (b) 80- to 100-ka plinian benmoreitic activity; (c) 16- to 80-ka strombolian to subplinian from basaltic to mugearitic activity; (d) 15.5- to 15-ka plinian benmoreitic activity accompanying the caldera-forming eruptions of the Ellittico Volcano; and (e) the most recent Ij-ka basaltic explosive activity of strombolian and subplinian type of the present edifice that also includes the 122-B.C. plinian eruption. This study results in a semi-quantitative and in some cases quantitative definition of the intensity and chronology of the explosive activity at Etna. Moreover, this work gives a new significance to the volcanic hazards of Etna, a volcano generally considered to be the site of gentle effusive eruptions.
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