HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS		QUICK SEARCH:   [advanced] Author: Keyword(s): Year:  Vol:  Page:

This Article Full Text (PDF) References Citation Map Services Email this article to a friend Similar articles in this journal Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via HighWire Citing Articles via Google Scholar Google Scholar Articles by JONGMANS, D. Articles by CAMPILLO, M. Search for Related Content GeoRef GeoRef Citation

The response of the Ubaye Valley (France) for incident SH and SV waves: Comparison between measurements and modeling

LABORATORIES DE GEOLOGIE DE L'INGÉNIEUR UNIVERSITÉ DE LIÈGE, BAT. B19, 4000 LIÈGE Belgium
LABORATOIRE DE GÉOPHYSIQUE INTERNE ET DE TECTONOPHYSIQUE I.R.I.G.M. UNIVERSITÉ JOSEPH FOURIER, BP 53 X, F38041 GRENOBLE France

Abstract

This paper presents a detailed study of the response of an alluvial valley in the Alps (France). The structure (Ubaye Valley) was chosen 1) for its moderate dimensions (500 m wide and 65 m thick), which allow an accurate determination of the deposit characteristics, and 2) for the relatively high seismicity of the region.

The study included the deployment of five temporary seismological stations, a seismic survey of the valley for determining the dynamic properties and the geometry of the soft deposits, and 1D and 2D numerical modeling for incident SH and SV waves.

Comparisons between observed and computed amplifications show a good agreement for frequencies lower than 10 Hz and the particular direction of arrival of the input motions corresponding to the 2D case. When the earthquake sources are not located in the continuation of the line of seismometers, the spectral ratios exhibit a great variability between different groups of similar events. These observations indicate the azimuthal dependence of the site response and the need for 3D modeling.

This article has been cited by other articles:

				Contribution of Dense Array Analysis to the Identification and Quantification of Basin-Edge-Induced Waves, Part II: Application to Grenoble Basin (French Alps) Bulletin of the Seismological Society of America, December 1, 2003; 93(6): 2624 - 2648.

				D. Jongmans, K. Pitilakis, D. Demanet, D. Raptakis, J. Riepl, C. Horrent, G. Tsokas, K. Lontzetidis, and P.-Y. Bard EURO-SEISTEST: Determination of the geological structure of the Volvi basin and validation of the basin response Bulletin of the Seismological Society of America, April 1, 1998; 88(2): 473 - 487. [Abstract] [PDF]

				L. Malagnini Velocity and attenuation structure of very shallow soils: Evidence for a frequency-dependent Q Bulletin of the Seismological Society of America, October 1, 1996; 86(5): 1471 - 1486. [Abstract] [PDF]

				L. Malagnini, P. Tricarico, A. Rovelli, R. B. Herrmann, S. Opice, G. Biella, and R. de Franco Explosion, earthquake, and ambient noise recordings in a Pliocene sediment-filled valley: Inferences on seismic response properties by reference- and non-reference-site techniques Bulletin of the Seismological Society of America, June 1, 1996; 86(3): 670 - 682. [Abstract] [PDF]

				M. Bouchon, C. A. Schultz, and M. Nafi Toksoz A fast implementation of boundary integral equation methods to calculate the propagation of seismic waves in laterally varying layered media Bulletin of the Seismological Society of America, December 1, 1995; 85(6): 1679 - 1687. [Abstract] [PDF]

				L. Malagnini, R. B. Herrmann, G. Biella, and R. de Franco Rayleigh waves in Quaternary alluvium from explosive sources: Determination of shear-wave velocity and Q structure Bulletin of the Seismological Society of America, June 1, 1995; 85(3): 900 - 922. [Abstract] [PDF]

				M. Bouchon and O. Coutant Calculation of synthetic seismograms in a laterally varying medium by the boundary element-discrete wavenumber method Bulletin of the Seismological Society of America, December 1, 1994; 84(6): 1869 - 1881. [Abstract] [PDF]