Abstract
After the event that struck the border between Calabria and Basilicata regions in Italy, a series of in-situ measurements were undertaken. Applying the methodology already used in the aftermath of Marche-Umbria, 1997 and Slovenia, 1998 earthquakes, HVSR were measured using aftershocks, microtremors and man-made excitations. The measurements were performed both on free-field and inside damaged buildings. It was possible to see how the enhancement of damage can be attributed to a double resonance effect observed when a building fundamental mode approaches soil resonance frequency. With respect to previous case studies, some more interesting effects were observed, namely: 1) differential damages in buildings that appear to be exactly similar but that show different fundamental frequency; 2) the coupling of frequency of adjacent building with different characteristics (RC and stone masonry); 3) the increase of amplification effect close to fault gauge zones not activated by the event. Transactions on the Built Environment vol 38 © 1999 WIT Press, www.witpress.com, ISSN 1743-3509
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