| Summary: | Preliminary investigation of subsurface properties by geophysical methods were carried out over the construction site
of the 40 meters Thai National Radio Telescope (TNRT) facility planning by National Astronomical Research Institute of
Thailand (NARIT) in the Huai Hong Khrai Royal Development Study Center, Doi Saket, Chiang Mai, Thailand. Multichannel
analysis of surface waves (MASW) and electrical resistivity tomography (ERT) were utilized in mapping of Vs distribution to
obtain information on ground stiffness and other supporting information on subsurface electrical resistivity, respectively. Results
from data analysis showed that the topsoil was very dense with thickness irregularly varied from 5 meters to10 meters overlying
the bedrock with high variation in stiffness caused by the different degrees of weathering. The information obtained led to the
conclusion that the proposed TNRT facility construction site is in the category of site class B of which the ground stability is
moderate and less vulnerable to earthquake damages.
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