Combination of Active (MASW) and Passive (Microtremor) Source Based Geophysical Approach

The microtremor and the MASW (Multi-channel Analysis of Surface Waves) survey were carried out to determine the shear wave velocity-depth information, resonance frequencies and the depths of the sedimentary layer in the Dinar city, Southwestern of Turkey. The shear-wave velocity profile of the basin sediments was estimated from the inversion of the microtremor horizontal-to-vertical spectrum based on surface waves from seismic noise at each site using a genetic algorithm. The average shear-wave velocities estimated from the multichannel analysis of surface waves experiments were given as constraints in the inversion. A new relationship was derived between the resonance frequency ( ) and thickness ( ) of the overlaying layer, which is given as