Seminar

Shear wave velocity-depth information is required for most investigations of ground motion response to
earthquakes in areas where significant soil cover exists. In addition, the stiffness of subsurface rocks can be
deciphered from the shear wave velocity and hence. It assumes great importance in earthquake hazard
assessment studies. The most important utility of shear wave velocity (VS) is to estimate the liquefaction
hazard potential of an area particularly in seismically active region. The characteristics of shear wave velocity
profile were determined from Rayleigh type surface waves of shallow subsurface covering a depth range of
30–40 m by multichannel analysis of surface wave technique (MASW) in Jabalpur- a seismically active region
with complex geology, India as well as in Musact city, Oman wherein the major factor controlling the
earthquake hazard is the proximity of the Makran seismic zone and the Oman Mountains. Accordingly, the
estimated velocity up to a depth of 30 m (VS30) range between 250-750 m/sec in Jabalpur, India covering all
geological units whereas in Muscat region, the velocity varies from 345 m/sec to 1200 m/sec. The results were
analyzed for possible liquefaction hazard in the study area and presented here. The salient features of the
results and the technique employed are highlighted in the presentation.