Bulletin of the Seismological Society of America
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Bulletin of the Seismological Society of America; February 2006; v. 96; no. 1; p. 228-236; DOI: 10.1785/0120050084
© 2006 Seismological Society of America
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Effect of Transient Seismic Noise on Estimates of H/V Spectral Ratios

S. Parolai1 and J. J. Galiana-Merino2

1 GeoForschungsZentrum Potsdam
Telegrafenberg
14473 Potsdam, Germany
parolai{at}gfz-potsdam.de
 (S.P.)

2 Departamento de Física
Ingeniería de Sistemas y Teoria de la Señal
Escuela Politécnica Superior
Universidad de Alicante
Ap. Correos 99
03080, Alicante, Spain
 (J.J.G.-M.)


Figure 001
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  		Figure 1. Left: time series (black); stationary-noise windows (gray). Right: transient windows. The 1-min length is indicated in black.

 

Figure 002
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  		Figure 2. Left: spectra of the time series (no window selection). Center: spectra of the stationary-noise windows. Right: spectra of the transient-noise windows (after removing the stationary part of the signal). Vertical is in black, north–south is in dark gray, and east–west is in light gray.

 

Figure 003
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  		Figure 3. Left: 60 sec of the synthetic signal (top), 60 sec of the synthetic signal + noise (maximum amplitude equal to 0.5 the maximum amplitude of the signal, middle), 60 sec of synthetic signal + noise (maximum amplitude equal to 1.0 the maximum amplitude of the signal). Center: the filtered signals. Right: spectral ratio between the spectra of the signal + 0.5 noise and the spectra of the signal + 1.0 noise.

 

Figure 004
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  		Figure 4. Left: average H/V spectral ratio and 95% confidence interval of the whole time series (black) and of stationary-noise windows (gray). Right: average H/V spectral ratio and 95% confidence interval of transient noise. Vertical bars indicate the position of the main peak in the H/V spectral ratio obtained using stationary-noise windows. Please note that the right and left panels have different Y scales.

 

Figure 005
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  		Figure 5. H/V spectral ratios versus distance for model 1. Top left: H/V spectral ratio calculated from the contribution of a combined vertical and horizontal source. Top right: H/V spectral ratio calculated considering only the contribution of the vertical source. Bottom left: H/V spectral ratio calculated considering only the contribution of horizontal sources. Bottom right: H/V spectral ratio calculated considering only the contribution of the radial component determined by a horizontal source. The horizontal black line indicates the fundamental resonance frequency of the model. Gray shows the amplification (values of H/V greater than 1).

 

Figure 006
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  		Figure 6. Same as Figure 5 but for model 2.

 

Figure 007
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  		Figure 7. Same as Figure 5 but for model 3.

 




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