Abstract

In this study, microtremor data are collected and interpreted at selected sites in the cities of Bolu and Düzce, both of which are located in major alluvial basins. SPAC method is used to estimate the one-dimensional S-wave velocity profile at the BOL and DZC strong motion stations located in Bolu and Düzce, respectively. In this applicatin, we directly match the observed and modeled coherency spectra rather than inverting the observed dispersion curves for the phase velocities. Adding HVSR information, we have estimated velocity profiles of moderate Vs contrasts in soft Miocene and Eocene sediments at depths in the range 136-209 m, and at depths in the range 2000 to 2200 m.

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