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(Article of periodic en Anglais - 2012)

Document title

The effect of glaciation on the intensity of seismic ground motion

Authors(s) and Affiliation(s)

MCCOLL S.T. (1) ; DAVIES T.R.H. (1) ; MCSAVENEY M.J. (2) ;
(1) Geological Sciences, Univ. of Canterbury, Christchurch, NOUVELLE-ZELANDE
(2) GNS Science, Avalon, NOUVELLE-ZELANDE

Abstract

Two-dimensional numerical models (FLAC 6.0) were used to explore how edifice shape, rock stiffness and various levels of ice inundation affect edifice shaking intensity. The modelling confirmed that earthquake shaking is enhanced with steeper topography and at ridge crests but it showed for the first time that total inundation by ice may reduce shaking intensity at hill crests. The effect is diminished to about 80-95% if glacier ice level reduces to half of the mountain slope height. In general, ice cover reduced shaking most of the steepest-sided edifices, for wave frequencies higher than 3 Hz, and when ice was thickest and the rock had shear stiffness well in excess of the stiffness of ice. The modelling supports the idea that topographic amplification of earthquake shaking increases as a result of glacial erosion and deglaciation. It is possible that the effect of this is sufficient to have influenced the distribution of post-glacial slope failures in glaciated seismically active areas

Source

Article of periodic

published at : Earth surface processes and landforms / ISSN 0197-9337 / CODEN ESPLDB

Editor : Wiley, Chichester - ROYAUME-UNI (1981)

Millesime : 2012, vol. 37, no12 [pp. 1290-1301]

Bibliographic references : 1 p.

Collation : 13 fig., 2 tabl.

Language

Anglais

INIST-CNRS, Cote INIST : 17355

Digital Object Identifier

Go to electronic document thanks to its DOI : doi:10.1002/esp.3251

Tous droits réservés © Prodig - Bibliographie Géographique Internationale (BGI), 2013
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