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Multiple sector collapses at stromboli volcano, Italy: how they work

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Abstract

This paper demonstrates that four large sector collapses have affected the NW flank of the Stromboli volcano in the past 13 ka, alternating with growth phases, in order to contribute to the evaluation of the critical conditions which trigger lateral collapses, a reconstruction of the geometry of each collapse of the volcano edifice in the four stages that preceded the relative collapse events is also presented, and a computation of the landslide volume. This reconstruction is based on new field data plotted in three dimensions. Prior to the initial 13-ka collapse, the volcano was 1125±100 m high above sea level. The collapse had a volume of 2.23±0.87 km3, whereas the pre-collapse volcano volume was 218.8±7.7 km3. The next edifice that failed was 900±70 m high a.s.l. The collapse volume was 1±0.54 km3, with a precollapse volcano volume of 201.4±5.4 km3. The edifice then grew to 1000±60 m a.s.l. The third collapse had a volume of 1.08±0.39 km3 and occurred within a volcano with a volume of 209.1±4.6 km3. This was followed by a new growth phase followed by the last collapse with a volume of 0.73±0.22 km3. The volcano volume was about the same as the present one. The present active crater zone is at 780 m a.s.l. in the first three collapses, sliding surfaces cut the main magma conduit. In the last collapse, the upper scarp coincided with the conduit location. Dyking along a main NE-trending weakness zone across the volcano summit exerted a lateral force for collapse inception. The decrease of the landslide volumes with the age, and the concentric scarps of the four collapses, suggest that the younger sliding planes tended to become more superficial and to decrease the areal extent. This is interpreted as due to: (a) successively weaker eruptive products from dominantly lavas to dominantly pyroclastics; and (b) the feedback effects between collapses and dykes that injected along the lateral segments of the first collapse slide plane.

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Correspondence to Alessandro Tibaldi.

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Published online: 21 March 2001

Editorial responsibility: M. Rosi

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Tibaldi, A. Multiple sector collapses at stromboli volcano, Italy: how they work. Bull Volcanol 63, 112–125 (2001). https://doi.org/10.1007/s004450100129

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Keywords Stromboli

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