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Underwater studies of recent lava flows around São Miguel (Azores)

Published online by Cambridge University Press:  01 May 2009

N. B. Mapstone ,
A. P. Rood  and
N. G. Jackson
N. B. Mapstone
Affiliation:
British Petroleum Co. Ltd BP Research Centre Sunbury-on-Thames Middlesex
A. P. Rood
Affiliation:
Crystallography DeptUniversity College London, Gower Street London W.C.1
N. G. Jackson
Affiliation:
Core Laboratories Inc 22 Leathermarket Street London S.E. 1
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Summary

An underwater study of recent submarine lava flows on São Miguel (Azores) suggests that the island has subsided by as much as 9 m relative to sea level over the last few thousand years. A spectacular system of overlapping lava arch structures occur immediately below the ancient sea level, and they are thought to have formed when tongues of molten lava flowed over a steep autochthonous submarine scree slope. The scree was subsequently removed by strong longshore currents and wave action.

Type
Articles
Information
Geological Magazine , Volume 112 , Issue 3 , May 1975 , pp. 309 - 314
Copyright
Copyright © Cambridge University Press 1975

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