We have carried out several long-term measures of seismic noise with triangular arrays of broad-band seismic sensors, to investigate the reliability of the SPAC method in urban areas. We investigate the stationary and anisotropy of the microtremor wave field. We have found that the anisotropy of the microtremor wave field can be evaluated analyzing the HVNSR as function the azimuth. Furthermore, we showed as strong anisotropies in the microtremors are often observable in particular at high frequencies (> 1 Hz). We have verified as microtremors can be difficult to considered as ergodic processes, and for this reason time averaging, also even over a long periods of time, cannot replace an appropriate azimuthal sampling.

D'Alessandro, A., Martorana, R., Capizzi, P., Luzio, D. (2015). Assessment of the reliability of the SPAC method in urban areas. In Near Surface Geoscience 2015 - 21st European Meeting of Environmental and Engineering Geophysics (pp.366-370). European Association of Geoscientists and Engineers, EAGE [10.3997/2214-4609.201413737].

Assessment of the reliability of the SPAC method in urban areas

D'ALESSANDRO, Antonino;MARTORANA, Raffaele;CAPIZZI, Patrizia;LUZIO, Dario
2015-01-01

Abstract

We have carried out several long-term measures of seismic noise with triangular arrays of broad-band seismic sensors, to investigate the reliability of the SPAC method in urban areas. We investigate the stationary and anisotropy of the microtremor wave field. We have found that the anisotropy of the microtremor wave field can be evaluated analyzing the HVNSR as function the azimuth. Furthermore, we showed as strong anisotropies in the microtremors are often observable in particular at high frequencies (> 1 Hz). We have verified as microtremors can be difficult to considered as ergodic processes, and for this reason time averaging, also even over a long periods of time, cannot replace an appropriate azimuthal sampling.
Settore GEO/11 - Geofisica Applicata
6-set-2015
21st European Meeting of Environmental and Engineering Geophysics, Near Surface Geoscience 2015
ita
2015
21
2015
5
Online
http://www.earthdoc.org/publication/publicationdetails/?publication=82332
D'Alessandro, A., Martorana, R., Capizzi, P., Luzio, D. (2015). Assessment of the reliability of the SPAC method in urban areas. In Near Surface Geoscience 2015 - 21st European Meeting of Environmental and Engineering Geophysics (pp.366-370). European Association of Geoscientists and Engineers, EAGE [10.3997/2214-4609.201413737].
Proceedings (atti dei congressi)
D'Alessandro, A.; Martorana, R.; Capizzi, P.; Luzio, D.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10447/172305
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