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Upper crustal structure of Deception Island area, Bransfield Strait, West Antarctica

Published online by Cambridge University Press:  13 May 2004

M. Grad ,
A. Guterch  and
P. Środa
M. Grad
Affiliation:
Institute of Geophysics, University of Warsaw, Pasteura 7, 02-093 Warsaw, Poland
A. Guterch
Affiliation:
Institute of Geophysics, Polish Academy of Sciences, Ks. Janusza 64, 01-452 Warsaw, Poland
P. Środa
Affiliation:
Institute of Geophysics, University of Warsaw, Pasteura 7, 02-093 Warsaw, Poland Institute of Geophysics, Polish Academy of Sciences, Ks. Janusza 64, 01-452 Warsaw, Poland
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Abstract

This paper describes the results of seismic refraction investigations of the upper crustal structure in the area of Deception Island, West Antarctica, which were made during the Polish Antarctic Geodynamical Expeditions in 1979-80 and 1987-88. In the caldera and immediate vicinity of Deception Island a layer of unconsolidated and poorly consolidated young sediments of 1.9–2.2 km s−1 P-wave velocity was found. Velocities of 4.1–4.3 km s−1 were found in the depth interval from 0.6–1.3 to about 3 km. Lateral differences in upper crustal structure between the south-eastern and western sectors were identified. In the region between Deception and Livingston islands an inclined boundary with a velocity of about 6.1 km s−1 occurs. A deep fault zone dividing crustal blocks beneath Deception Island is associated with a prominent volcanic line within Bransfield Strait extending between Deception and Bridgeman islands.

Keywords

West AntarcticaDeception Islandcrustal structureseismic modelling
Type
Papers—Earth Sciences and Glaciology
Information
Antarctic Science , Volume 4 , Issue 4 , December 1992 , pp. 469 - 476
Copyright
© Antarctic Science Ltd 1992

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