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Seismological constraints on ice properties at Dome C, Antarctica, from horizontal to vertical spectral ratios

Published online by Cambridge University Press:  01 July 2010

Jean-Jacques Lévêque ,
Alessia Maggi  and
Annie Souriau
Jean-Jacques Lévêque
Affiliation:
CNRS, Université de Strasbourg, 5 rue René Descartes, 67084 Strasbourg Cedex, France
Alessia Maggi
Affiliation:
CNRS, Université de Strasbourg, 5 rue René Descartes, 67084 Strasbourg Cedex, France
Annie Souriau*
Affiliation:
CNRS, Observatoire Midi-Pyrénées, 14 avenue Edouard Belin, 31400 Toulouse, France
*
*Annie.Souriau@dtp.obs-mip.fr
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Abstract

The French-Italian Concordia (CCD) seismological station at Dome C is one of two observatories setup on the ice cap in the interior of the Antarctic continent. We analysed the seismic signal due to ambient noise at this station and at three temporary stations 5 km away from Concordia, in order to specify the ice properties beneath them. A method based on the horizontal to vertical (H/V) spectral ratio, commonly used to analyse soil response in seismic regions, was applied to the Antarctic stations. The main peak in the spectral ratios is observed at frequencies 6.7–8 Hz at the Dome C stations, but it is not observed at another station on the ice cap, QSPA, where the sensor is buried at 275 m depth. This peak can be explained by a 23 m thick unconsolidated snow or firn layer with a low S-wave velocity of 0.7 km s-1, overlying a consolidated layer with S-wave velocity 1.8 km s-1. Despite the non-uniqueness of the solutions obtained by fitting the H/V spectra, this model is preferred because the depth of the velocity contrast coincides with the density at which ice particles arrange themselves in a continuous, dense lattice. A small variability of this structure is observed around Dome C.

Keywords

Antarctic seismological stationsConcordiafirnseismic ambient noise

Information

Type
Physical Sciences
Information
Antarctic Science , Volume 22 , Issue 5 , October 2010 , pp. 572 - 579
Copyright
Copyright © Antarctic Science Ltd 2010

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