| High-resolution S-wave reflection surveying has been conducted on the paved surface utilizing Land Streamer which was originally developed by the author. The Land Streamer is featured by nonstretch towing member on which geophone units are mounted or hooked. The geophone units are coupled with paved surface without being planted to the ground. Since 1997, we have conducted production surveys using S-wave type Land Streamer at 27 sites, 46 lines, in Japan, and successfully delineated detailed near-surface structure down to 100 m. Especially, the tool has been utilized to active fault survey, because it is capable to discriminate vertical displacement of sediment layers less than 1 m owing to shorter wavelength of S-waves in the near-surface sediments compared with that of P-waves. |
