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| | 講演要旨(英文) | | Lateral shear wave variations in shallow soils may generate complex waves that interfere to disturb expected response of buildings. Detecting those irregularities and estimating their impact on ground motion will help to mitigate earthquake damage upon man mad structures. We are developing a new seismic approach based on the inversion of the P-SV refraction data to profile the two dimensional shallow soils. Forward calculation of waves in a soil model is simulated through a 2.5D Finite difference staggered grid. The algorithm used for the inversion is the hybrid heuristic search method proposed by Yamanaka (2007). Numerical experiments showed the ability of this method to properly reconstruct complex soil models in noisy environments. The current study aims to verify the applicability of our method to real data. We conducted a field survey in our university campus and tried to invert the two dimensional soil model. The 2D soil profile obtained by inversion shows agreement with existing borehole profile underling comparable soil structure, the inversion also allowed the detection of a lateral velocity gradient within the second layer of the soil. |
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