Frequency dependence of site amplification factor in the Messina Strait area |
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| Authors: | M L Alonzo A Bottari V Caruso C Godano |
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| Institution: | (1) Istituto geofisico e geodetico, Universita' di Messina, Italy;(2) Osservatorio Vesuviano, Napoli, Italy |
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| Abstract: | The spectral ratio method is used here for evaluating the frequency dependence of a site amplification factor in the Messina Strait area. All stations exhibit the same features of spectral ratios evidencing two peaks at about 10 Hz and 16 Hz. We relate this observation to the same geological structures. In fact, all the stations (except the referenced one) are situated over pleistocenic sediments with a similar grain size. This causes the disappearing of any site effect when the average spectrum is used as a reference. MES station, situated in the city of Messina, presents a clear site effect at a different frequency (6 Hz) which cannot be related to any geological structure because no substantial difference is observed between the sediments on which this station is situated and the sediments on which the other stations are situated. MT1 station exhibits a spectral peak at about 2 Hz which can be explained with oscillations of a little sedimentary basin. |
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| Keywords: | Site frequency ratio |
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