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|Authors: ||De Rose, C.*|
Tafaro, A. F.*
|Title: ||Site effect in Messina and Reggio Calabria Area using HVSR tecnique|
|Title of journal: ||RENDICONTI ONLINE DELLA SOCIETÀ GEOLOGICA ITALIANA|
|Series/Report no.: ||/21 (2012)|
|Issue Date: ||2012|
|Keywords: ||HVSR technique|
|Abstract: ||The Messina Strait is one of the most seismically active areas of the Southern Italy; in fact, since 1783, 7 earthquakes with M ranging between 6.0 and 7.2, are reported with extensive damages and induced coseismic environmental effects well
described. The most remarkable phenomena were massive landslides (with consequent obstruction of the valleys), small
lakes formation, watercourses deviation, slumps, soil fracturing and liquefaction; in the urban area many of the coesismic effects
were without doubt due to the settlement of loose sediments and artificial filling (e.g., Messina and Reggio Calabria dock areas).
The aim of this work is to understand whether the site effect (generated by resonance phenomena in the upper sediments
layers) could affect, at least partially, the distribution of urban damage after the 1908 earthquake. In fact the existence of
detailed damage information for this earthquake, collected by one of the most relevant seismologist of that time (BARATTA, 1910), provides the opportunity of making a comparison between observed damage and the natural frequency of the foundation
For this purpose a geophysical survey was carried out in the two main cities of the Straits, and the HVSR method was adopted
to identify areas subject to amplification effects and delineate the geometry of sedimentary bodies.
The microtremor HVSR method (originally proposed by NOGOSHI AND IGARASHI (1970) and later diffused by NAKAMURA (1989) widely used for site effect study provides a direct
estimate of the resonance frequencies of sedimentary cover, which tend to amplify soil motion in the case of earthquake.|
|Appears in Collections:||04.06.11. Seismic risk|
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