ESTIMATION OF SHEAR WAVE VELOCITY PROFILE FROM EXPLOSION SOURCE

Abstract

This study aimed to propose a simple correlation of shear wave velocity derived from explosion source at five locations located in Mahasarakham, Surin, Udonthani, Suphanburi and Suratthani province. First, the Simple Method (SM) was been a simple technique for shear wave velocity survey and was applied to analyze vibration records of ground surface through the established dispersion curve. Second, the Multichannel Analysis of Surface Wave Method (MASW) has limited in terms of the depth because the shear wave velocity was generated by a sledgehammer. Third, the Downhole Seismic Test (DH) was not often been economically feasible to carry out the shear wave velocity measurements; therefore, the present study was adopted to evaluate shear wave velocity profile from the underground explosion source. The results of SM were in fairly well agreement with those obtained from MASW and DH test. Required parameters were then obtained through the calibration with the result from MASW and DH test. This result is implied that the ground surface vibration record from the deep underground explosion (from seismic survey project) can be properly used to estimate the shear velocity profile of the interested site. This is very important because there are considerable amount of such information especially from the seismic survey projects. The SM method has been for site amplification evaluation, liquefaction potential, seismic hazard study and city planning.