Dynamics of a confined lava flow on Kilauea volcano, Hawaii

Heslop, Sally E. and Wilson, Lionel and Pinkerton, Harry and Head, James W. (1989) Dynamics of a confined lava flow on Kilauea volcano, Hawaii. Bulletin of Volcanology, 51 (6). pp. 415-432. ISSN 0258-8900

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Abstract

This paper presents a new method of analysing lava flow deposits which allows the velocity, discharge rate and rheological properties of channelled moving lavas to be calculated. The theory is applied to a lava flow which was erupted on Kilauea in July 1974. This flow came from a line of fissures on the edge of the caldera and was confined to a pre-existing gully within 50 m of leaving the vent. The lava drained onto the floor of the caldera when the activity stopped, but left wall and floor deposits which showed that the lava "banked up" as it flowed around each of the bends. Field surveys established the radius of curvature of each bend and the associated lava levels, and these data, together with related field and laboratory measurements, are used to study the rheology of the lava. The results show the flow to have been fast moving but still laminar, with a mean velocity of just over 8 m s-1; the lava had a low or negligible yield strength and viscosities in the range 85-140 Pa s. An extension of the basic method is considered, and the possibility of supercritical flow discussed.

Item Type: Journal Article
Journal or Publication Title: Bulletin of Volcanology
Uncontrolled Keywords: /dk/atira/pure/subjectarea/asjc/1900/1906
Subjects:
Departments: Faculty of Science and Technology > Lancaster Environment Centre
ID Code: 134665
Deposited By: ep_importer_pure
Deposited On: 22 Jun 2019 09:16
Refereed?: Yes
Published?: Published
Last Modified: 30 Sep 2019 22:01
URI: https://eprints.lancs.ac.uk/id/eprint/134665

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