Bedrock Effect on Estimating Sediment Thickness Using Microtremor Analysis Methods

This study analyses microtremor measurement to\ud estimate the thickness of soft soil based on their resonant \ud frequency. This frequency has been determined from the\ud H/V and classical techniques. The results from both of\ud this technique are cross-sectional profiles that show the\ud structure of the sediments below the surface area. Then\ud these two cross section profile compare with SPT boring\ud log test and the result shows that the classical technique\ud (S/R technique) is an appropriate method to determine the\ud sediment thickness on this area than the Nakamura\ud technique (H/V technique). Based on support data, we\ud believe this caused by bedrock effect which is not only\ud the different impedance that influences resonant\ud frequency but also the thickness of sediment from\ud bedrock is the most important things