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Authors: Signanini, P.* 
De Santis, A.* 
Title: Power-law frequency distribution of H/V spectral ratio of seismic signals: Evidence for a critical crust
Journal: Earth, Planets and Space 
Series/Report no.: 1 / 64 (2012)
Publisher: TERRAPUB
Issue Date: 7-Mar-2012
DOI: 10.5047/eps.2011.08.006
Keywords: Seismic signal
critical crust
H/V spectral ratio
fractal dimension
Subject Classification04. Solid Earth::04.06. Seismology::04.06.02. Earthquake interactions and probability 
Abstract: We analyse records from several seismic stations in Central Italy (including some with multiple recording sites) for the statistical properties of spectra of both noise and earthquake signals. The main result is that the power-law scaling of most of the spectral H/V ratio statistical distributions leads to a so-called heavy tail. This is interpreted as a statistical distribution with a fractal dimension of about 2, which is almost certainly caused by a porous percolating medium beneath the stations due to some universal property of the crustal rocks crossed by the elastic waves propagation suggesting that the uppermost crust is in a critical state.
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