HORIZONTAL TO VERTICAL SPECTRAL RATIO AND GEOLOGICAL CONDITIONS - AN ANALYSIS OF STRONG-MOTION DATA FROM GREECE AND TAIWAN (SMART-1)

Nowadays, several research efforts have been directed towards the eval uation of the horizontal to vertical, (h/v), spectral ratio technique, following the pioneering work of Nakamura originally proposed for mic rotremor measurements. In the present study, an extension of this tech nique based on Greek and Taiwanese (SMART-1) strong motion data is att empted. Whenever possible comparisons with results obtained by the sta ndard spectral ratio technique for the same sites are made. Regarding the Greek data it is concluded that (h/v) spectral ratio clearly disti nguishes the range of resonant peaks between 'rock' and 'alluvium' sit es. On the other hand, nonlinear effects that take place beneath SMART -1 array most probably obscure the expected consistency between (h/v) and standard spectral ratio technique.