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SHEAR WAVE VELOCITY ESTIMATION USING MULTICHANNEL ANALYSIS OF SURFACE WAVE AND SMALL SCALE MICROTREMOR MEASUREMENT FOR SEISMIC SITE CHARACTERIZATION

Session: Insitu Testing and Instrumentation II / Essais in situ et instrumentation II

Md. Zillur Rahman, PhD Student (Canada)
Sumi Siddiqua, Assistant Professor (Canada)
A. S. M. Maksud Kamal, Professor (Bangladesh)

Average shear wave velocity of the near surface materials up to a depth of 30 m (AVS30) has been estimated using Multichannel Analysis of Surface Wave (MASW) and Small Scale Microtremor Measurement (SSMM) methods. MASW and SSMM are non-invasive and the most economic techniques to accurately estimate AVS30. MASW and SSMM have been carried out at 39 points in Chittagong City, Bangladesh. The results of MASW and SSMM data have been combined to estimate AVS30. The AVS30 of the soils of the city varies from 123 to 420 m/sec. According to the National Earthquake Hazards Reduction Program (NEHRP), the soils of the city are classified as site classes C, D, E and F. The amplification factor of the seismic waves within the soils of the city can be estimated from site classes. Therefore AVS30 estimation by MASW and SSMM methods is a promising option for seismic site characterization.