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|Authors: ||Strollo, A.*|
|Title: ||Suitability of short-period sensors for retrieving reliable H/V peaks for frequencies less than 1 Hz|
|Issue Date: ||2007|
|Keywords: ||instrumental noise|
horizontal-to-vertical spectral ratio
|Abstract: ||Using three different short-period electromagnetic sensors with resonant frequencies of 1 Hz (Mark L4C-3D), 2 Hz (Mark L-22D), and 4.5 Hz (I/O SM-6), coupled with three digital
acquisition system, the PDAS Teledyne Geotech, the REFTEK 72A, and the Earth Data
Logger PR6-24 (EDL), the effect of the seismic instruments on the horizontal-to-vertical spectral ratio (H/V) using seismic noise for frequencies less than 1 Hz has been evaluated. For all possible sensors - acquisition system pairs, the background seismic signal and instrumental
self-noise power spectral densities have been calculated and compared. The results obtained when coupling the short-period sensors with different acquisition systems show that the performance of the considered instruments at frequencies < 1 Hz strongly depends upon the
sensor-acquisition system combination and the gain used, with the best performance obtained for sensors with the lowest resonance frequency. For all acquisition systems, it was possible to retrieve correctly the H/V peak down to 0.1-0.2 Hz by using a high gain and a 1 Hz sensor.
In contrast, biased H/V spectral ratios were retrieved when low-gain values were considered.
Particular care is required when using 4.5 Hz sensors since they may not even allow the
fundamental resonance frequency peak to be reproduced|
|Appears in Collections:||Manuscripts|
04.02.07. Instruments and techniques
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|Strollo_et_al_BSSA_accepted.pdf||main article||3.42 MB||Adobe PDF||View/Open
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