Bulletin of the Seismological Society of America
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Bulletin of the Seismological Society of America; October 2006; v. 96; no. 5; p. 1915-1933; DOI: 10.1785/0120060119
© 2006 Seismological Society of America
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Deriving Wavefield Characteristics and Shear-Velocity Profiles from Two- Dimensional Small-Aperture Arrays Analysis of Ambient Vibrations in a Small-Size Alluvial Basin, Colfiorito, Italy

Giuseppe Di Giulio1, Cecile Cornou2, Matthias Ohrnberger3, Marc Wathelet*,4 and Antonio Rovelli5

1 Istituto Nazionale di Geofisica e Vulcanologia,
Via Castello d'Aquino 13
Grotttaminarda, 83035, Avellino, Italy
 (G.D.G.)
2 Laboratoire de Géophysique Interne et Tectonophysique (LGIT/IRD),
Maison des Geosciences
BP53, 38041 Grenoble Cédex 9
Grenoble, France
 (C.C.)
3 Institut für Geowissenschaften, Universität Potsdam (IGUP)
Karl-Liebknecht-Strasse 24
D-14476 Golm, Potsdam, Germany
 (M.O.)
4 GEOMAC, University of Liège,
1 Chemin des Chevreuils, B52
4000 Liege, Belgium
 (M.W.)
5 Istituto Nazionale di Geofisica e Vulcanologia,
Via di Vigna Murata 605
00143 Rome, Italy
 (A.R.)

* Present address: Laboratoire de Géophysique Interne et Tectonophysique (LGIT/IRD), Grenoble, France.

We analyze the dispersion characteristics of ambient noise vibrations. For this purpose, two-dimensional (2D) seismic array data were acquired in four different sites in the Colfiorito plain, an alluvial intramountain basin that exhibits strong site effects. Assuming seismic noise being mainly composed of surface waves, we derive one-dimensional (1D) shallow shear-velocity profiles through the inversion of dispersion curves measured by frequency–wavenumber (f-k) methods. The inverted shear-wave velocity profiles are consistent with a priori information for those sites that can be approximated by 1D simple models. In these cases, the use of passive records of seismic vibrations can be a valuable tool for determining the shallow velocity profile if a detailed depiction of velocity structure is not required. The theoretical dispersion curves for Rayleigh and Love waves were compared with the measured dispersion curves for vertical and horizontal components, respectively. This allows us to discuss qualitatively the composition of ambient vibrations (outlining a large proportion of Love waves in the noise wave field) and the effects of higher modes. We also use the single-station method for investigating the origin of the horizontal-to-vertical (H/V) peak in the plain of Colfiorito in terms of ellipticity of the fundamental Rayleigh mode.






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