Wave propagation in heterogeneous material and soil with barrier for ambient  vibration control.
Torsional motion and ground motion coupling in two horizontal directions and its effect on soil amplification characteristics.
Near-field characteristics of earthquake ground motion and its numerical simulations using moving green function.
On-site analysis of non-linear site response and actual dynamic soil properties in frequency and time domains.
Linear and non-linear system identification using adaptive system (ARX, ARMAX, …) identification techniques.
Investigation on the application of SASW (Spectral Analysis of Surface Waves) technique (advantage and disadvantage) with upgrading to automatic inverse identification method.
Investigation in microtremor data processing and introducing a new method (so called Segmental cross-spectrum) in spectral analysis of microtremors and its effect in spectral analysis of earthquake data for site response analysis and seismic microzonation.