Multichannel Analysis of Surface Wave and 2D Seismic Refraction Tomography – Vp and Vs Estimation in Pyroclastic Soils

P203 MULTICHANNEL ANALYSIS OF SURFACE WAVE AND 2D SEISMIC REFRACTION TOMOGRAPHY – VP AND VS ESTIMATION IN PYROCLASTIC SOILS Abstract Figura 1: Geological map of Campi Flegrei volcanic area. 1: regional faults. 2: caldera rims. 3: Campi Flegrei active area. 4: Quaternary deposits. 1 The detailed knowledge of S and P-wave velocities (Vs and Vp respectively) distribution in the nearsurface of a heterogeneous area characterized by unconsolidated soils is crucial to estimate the subsurface geological and geotechnical conditions. In fact the elastic properties of near-surface material and their effects on seismic wave propagation are controlled by the presence of ground