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Cavola experiment site: geophysical investigations and deployment of a dense seismic array on a landslide

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posted on 2016-04-13, 11:59 authored by P. Bordoni, J. Haines, G. Di Giulio, G. Milana, P. Augliera, M. Cercato, L. Martelli, F. Cara, Cavola Experiment Team
Geophysical site investigations have been performed in association with deployment of a dense array of 95 3-component seismometers on the Cavola landslide in the Northern Apennines. The aim of the array is to study propagation of seismic waves in the heterogeneous medium through comparison of observation and modelling. The small-aperture array (130 m×56 m) operated continuously for three months in 2004. Cavola landslide consists of a clay body sliding over mudstone-shale basement, and has a record of historical activity, including destruction of a small village in 1960. The site investigations include down-hole logging of P- and S-wave travel times at a new borehole drilled within the array, two seismic refraction lines with both P-wave profiling and surface-wave analyses, geo-electrical profiles and seismic noise measurements. From the different approaches a consistent picture of the depths and seismic velocities for the landslide has emerged. Their estimates agree with resonance frequencies of seismic noise, and also with the logged depths to basement of 25 m at a new borehole and of 44 m at a pre-existing borehole. Velocities for S waves increase with depth, from 230 m/s at the surface to 625 m/s in basement immediately below the landslide.

Funding

The project was co-funded by i) Area Ambiente e Sviluppo Sostenibile of Provincia di Modena; ii) Area Pianificazione e Tutela del Territorio of Provincia di Reggio Emilia; iii) Servizio Tecnico of Comune di Toano; iv) Servizio Geologico, Sismico e dei Suoli of Regione Emilia Romagna; and v) Istituto Na-zionale di Geofisica e Vulcanologia, Centro Na-zionale Terremoti (INGV).

History

Citation

Annals of Geophysics, Vol. 50, N. 5, October 2007

Version

  • VoR (Version of Record)

Published in

Annals of Geophysics

Publisher

INGV, Istituto Nazionale di Geofisica e Vulcanologia

issn

1593-5213

eissn

2037-416X

Acceptance date

2007-11-26

Available date

2016-04-13

Publisher version

http://www.annalsofgeophysics.eu/index.php/annals/article/view/3063

Language

en

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