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Detection of Spurious Maxima in the Site Amplification Characteristics Estimated by the HVSR Technique

Department of Earth Sciences
University of Siena
Via Laterina 8, Siena, Italy
albarello{at}unisi.it

Manuscript received 21 December 1999.

Spurious peaks in the site amplification characteristics estimated by horizontal-to-vertical spectral ratios (HVSR) of microtremors can be generated when ground motion is characterized by negligible spectral amplitudes and instrumental/numerical noise is dominant. In order to individuate HVSR maxima that cannot be safely considered as an effect of actual ground-motion characteristics, a new statistical procedure is proposed. In particular, statistics can be computed with the assumption that random noise is Gaussian. In this case, it results that the proposed statistics are independent from the level of noise and only depends on the procedures adopted for the computations of spectral amplitudes from the monitored signal. In order to use such statistics to discriminate suspect HVSR peaks, its major sampling properties in the case of signal dominated by random noise have been deduced by numerical simulations. An application of this methodology to HVSR measurements carried out at a test site in northern Italy is described and discussed.

This article has been cited by other articles:

				M. Picozzi, S. Parolai, and D. Albarello Statistical Analysis of Noise Horizontal-to-Vertical Spectral Ratios (HVSR) Bulletin of the Seismological Society of America, October 1, 2005; 95(5): 1779 - 1786. [Abstract] [Full Text] [PDF]