Analysis and Modeling of hvsr in the Presence of a Velocity Inversion: The Case of Venosa, Italy

摘要: The aim of this work is to check the stability horizontal-to-vertical spectral ratios (HVSRs) calculated at Venosa station site (Italy). This lies over a layer anthropogenic fill (4 m thick), rigid conglomerates (15 and thick clays (about 300 thick) above seismic bedrock. velocity inversion, which takes place conglomerates-clays interface, main importance for amplification behavior site. We have analyzed nearly 2 years data, composed 244 triggered noise records 44 earthquakes. results obtained by two data sets show different site-response characteristics. In particular, earthquake HVSR not deamplified in frequency range 1-8 Hz like HVSR. To find out origin difference, we modeled both earthquakes, taking advantage an improved ver- sion Thompson-Haskell propagation matrix method. differences between triggered-noise- earthquake-amplification functions might be explained difference composition wave fields. Moreover, that nonlinear explain presence misfit resonance attributed