The horizontal to vertical spectral ratio (HVSR) technique of microtremor measurement is widely applied in microzonation and site response studies. Given the small amplitude of the measured signal, unwanted disturbances may adversely affect the results. We analysed the influence of local wind on microtremor measurements as follows: first, we studied variation in HVSR at a permanent, three-component seismological station under various wind patterns; second, we conducted an experiment under controlled condition in a wind room equipped with a laser particle image velocimeter, analysing the effect of increasing wind speed on various sensor/digitizer configurations; third, we undertook numerical modelling to explain the observed data. Our main conclusions are that wind increases the amplitude of all components of the microtremor wavefield, but does not affect HVSR; however, certain sensor/digitizer configurations can be adversely affected by instrumental noise due to turbulence at the air/instrument/ground interface

Wind influence on seismic noise measurements

MUCCIARELLI, Marco;DI GIACOMO, DOMENICO;NINO, Enrico
2005

Abstract

The horizontal to vertical spectral ratio (HVSR) technique of microtremor measurement is widely applied in microzonation and site response studies. Given the small amplitude of the measured signal, unwanted disturbances may adversely affect the results. We analysed the influence of local wind on microtremor measurements as follows: first, we studied variation in HVSR at a permanent, three-component seismological station under various wind patterns; second, we conducted an experiment under controlled condition in a wind room equipped with a laser particle image velocimeter, analysing the effect of increasing wind speed on various sensor/digitizer configurations; third, we undertook numerical modelling to explain the observed data. Our main conclusions are that wind increases the amplitude of all components of the microtremor wavefield, but does not affect HVSR; however, certain sensor/digitizer configurations can be adversely affected by instrumental noise due to turbulence at the air/instrument/ground interface
File in questo prodotto:
File Dimensione Formato  
windpaper.pdf

non disponibili

Tipologia: Documento in Post-print
Licenza: DRM non definito
Dimensione 303.98 kB
Formato Adobe PDF
303.98 kB Adobe PDF   Visualizza/Apri   Richiedi una copia

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11563/115
 Attenzione

Attenzione! I dati visualizzati non sono stati sottoposti a validazione da parte dell'ateneo

Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 44
  • ???jsp.display-item.citation.isi??? ND
social impact