Publication Date:
2018-10-23
Description:
Noise measurements were recorded using a dense short-period seismic
array in Terzigno (Naples), a town that is located about 6 km from the Vesuvius crater. The
aim of this study was to calculate a surface velocity model of the area under investigation
through the application of the Spatial Autocorrelation (SPAC) method, with the hypotheses
that ambient noise is stationary both in time and space, and that it is composed of surface
dispersive waves. The correct knowledge of the surface structure is an important goal in
site-effects studies. Correlation coefficients were calculated as functions of the azimuth on
noise recorded at pairs of equally spaced stations in the frequency range of 1-8 Hz. Then,
the spatial average correlation coefficients were compared to estimates over long-term
recordings. The results appear to validate the hypothesis that ambient noise can be
considered as a stochastic process. The correlation-frequency curves have been fitted to
Bessel functions, from which the Rayleigh wave dispersion curve has been calculated. A
velocity model has been derived from the dispersion curve using both trial and error and a
standard inversion procedure. The results are consistent with those obtained from array
measurements in the area in other studies (Scarpa et al., 2003).
Description:
Unpublished
Description:
Grenoble, France, 30 August - 1 September 2006
Description:
open
Keywords:
NONE
;
04. Solid Earth::04.06. Seismology::04.06.05. Historical seismology
Repository Name:
Istituto Nazionale di Geofisica e Vulcanologia (INGV)
Type:
Conference paper
Format:
105689 bytes
Format:
application/pdf
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