Response spectra for the deep sediment-filled Rhône Valley in the Swiss Alps

Havenith, Hans-Balder; Fäh, Donat; Álvarez-Rubio, Sonia; Roten, Daniel

doi:10.1016/j.soildyn.2008.01.016

Cited by 7 publications

(1 citation statement)

References 16 publications

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“…BB85, Fäh et al 1994;Moczo et al 1996;Steimen et al 2003;Frischknecht & Wagner 2004;Roten et al 2006; Pfiffner et al (1997). 2008; Havenith et al 2009;Le Roux et al 2012). Conversely, only a small number of studies include actual observations of the phenomenon.…”

Section: Introductionmentioning

confidence: 99%

Fundamental and higher two-dimensional resonance modes of an Alpine valley

Ermert¹,

Poggi

Burjánek

et al. 2014

Geophysical Journal International

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We investigated the sequence of 2-D resonance modes of the sediment fill of Rhône Valley, Southern Swiss Alps, a strongly overdeepened, glacially carved basin with a sediment fill reaching a thickness of up to 900 m. From synchronous array recordings of ambient vibrations at six locations between Martigny and Sion we were able to identify several resonance modes, in particular, previously unmeasured higher modes. Data processing was performed with frequency domain decomposition of the cross-spectral density matrices of the recordings and with time-frequency dependent polarization analysis. 2-D finite element modal analysis was performed to support the interpretation of processing results and to investigate mode shapes at depth. In addition, several models of realistic bedrock geometries and velocity structures could be used to qualitatively assess the sensitivity of mode shape and particle motion dip angle to subsurface properties. The variability of modal characteristics due to subsurface properties makes an interpretation of the modes purely from surface observations challenging. We conclude that while a wealth of information on subsurface structure is contained in the modal characteristics, a careful strategy for their interpretation is needed to retrieve this information.

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