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- W4248541396 abstract "Lava extrusion from fissures on the flanks of the Etna volcano is a common feature of recent activity, as evidenced by the eruptions of 1971, 1981, 1983, and 1985, and was of similar importance during prehistoric times. We propose here a model within which the location and orientations of the large majority of historic eruptive fissures on Etna's flanks, together with their feeder-dykes, are explained within the framework of a gravitational stress regime. Stress orientations within this regime are controlled largely by the gross morphology of the volcano, but are significantly modified by local topographic anomalies. We propose that the gravitational stress regime largely supercedes an earlier developed regional tectonic stress regime, which still operates in the sub-volcanic basement, and may remain the dominant control of eruptive fissure and feeder-dyke disposition at lower altitudes on the flanks. The proposed model is supported by: (1) detailed examination of fissure locations and orientations, and the relationship between fissure azimuths and topography; (2) precise horizontal distance measurement and vertical ground deformation studies of a recent eruption; and (3) qualitative physical modelling experiments in which coloured water is injected into solidified gelatine solutions representing variously shaped volcanic constructs. A cautious approach is advocated when extrapolating trends of spatially limited fissure segments for the purpose of locating potential sites of magma ascent, and implications of the model for hazard analysis are outlined." @default.
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- W4248541396 date "1985-12-01" @default.
- W4248541396 modified "2023-09-25" @default.
- W4248541396 title "The Valle del Bove, Mount Etna: Its origin and relation to the stratigraphy and structure of the volcano — Reply" @default.
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- W4248541396 doi "https://doi.org/10.1016/0377-0273(85)90067-8" @default.
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