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Please use this identifier to cite or link to this item: http://hdl.handle.net/2122/5567

Authors: Massa, M.*
Lovati, S.*
Di Giacomo, D.*
Marzorati, S.*
D'Alema, E.*
Augliera, P.*
Title: A Microtremor Survey in the Area Shocked by the ML 5.2 Salò Earthquake (North Italy): An Empirical Approach to Determine the Effects of Ground Motions
Title of journal: Journal of Earthquake Engineering
Series/Report no.: /13 (2009)
Issue Date: 1-Oct-2009
DOI: 10.1080/13632460802663265
Keywords: Salo` Earthquake; Local Surface Geology; HV Spectral Ratios; Nonparametric
Abstract: In this work, the results of a quick microtremor survey performed in the municipalities situated in the epicentre area of the Ml 5.2 2004 Salo` earthquake (North Italy) are presented. The aim of this study is to understand if the large amount of damage caused by the event (about 215 million euros only in the areas near to the epicenter) is correlated more to the local surface geology conditions or to the vulnerability of ancient Italian historical centers. A preliminary seismic zonation was carried out in 5 villages including about 30 measurements of microtremors analyzed by the Nakamura technique (hereinafter HVNR). The points of measurement were carefully selected considering sites located both near damaged buildings and over different local geology conditions (alluvium deposits, fluvial-glacial deposits, debris fans and rock). In order to strengthen the HVNR results and to evaluate the reliability of the Nakamura analysis, a comparison with spectral ratios calculated on earthquakes (hereinafter HVSR) recorded at the strong motion station of Vobarno was made. In general, the outcomes of the survey highlight a possible correlation between local geology conditions and ground motion amplification for different frequency bands. In order to check if this evidence is linked with the damage, a series of macroseismic intensity values were collected for different zones of the investigated area, and a nonparametric correlation approach was used to establish a possible correlation between damage and ground motion amplification for selected frequency bands. The results show, from a statistical point of view, that in the area surrounding the epicenter of the November 24, 2004 mainshock, the damage pattern is not strongly dependent upon the local surface geology but more correlated to the low quality of the civil structures present in the area, including old buildings of the last century.
Appears in Collections:04.01.99. General or miscellaneous
04.02.06. Seismic methods
04.02.07. Instruments and techniques
Papers Published / Papers in press

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