DBPapers
DOI: 10.5593/sgem2012/s06.v2003

BACKGROUND NOISE MEASUREMENTS IN THE INDUSTRIAL AREA OF SULMONA, CENTRAL ITALY

A. RINALDINI, M. CIUCCI, A. MARINO, S. BELLAGAMBA, G. BUCCHERI
Wednesday 1 August 2012 by Libadmin2012

References: 12th International Multidisciplinary Scientific GeoConference, www.sgem.org, SGEM2012 Conference Proceedings/ ISSN 1314-2704, June 17-23, 2012, Vol. 2, 555 - 562 pp

ABSTRACT

This paper deals with both spectral and array techniques aimed at the assessment of
local seismic response in the industrial district of the Sulmona basin, Central Apennines.
A geotechnical characterization of the subsoil was accomplished using a geognostic
database developed both collecting data by carrying out cross-hole investigations, and
acquiring information provided by previous field prospectings. Shear-waves velocities
values of subsurface layers were measured in 3 couples of boreholes and on undisturbed
core samples were defined both the main static and dynamic geotechnical properties.
Background noise measurements were performed applying the Nakamura’s technique
(HVSR), that allow to compute the fundamental vibration period at the selected site.
Three arrays of noise measurements were performed in free field disposed along the
basin both longitudinally and transversally; data were collected in the dominion of the
frequencies calculating, for each component, the mean of the Fourier spectra obtained
by acquisition windows with a time span of 40 seconds. The H/V spectral ratios were
collected in the 1-10 Hz building interest frequency domain and data were used to
calibrate the 1-D simulations, performed by using as source a seismic record of M=5.5.
The obtained results point out that local site effects are present in the central and eastern
part of the basin.

Keywords: Geognostic investigations, H/V spectral ratios, resonance frequencies,
seismic risk, industrial activities