The investigation abandoned air-raid shelters by a high resolution S-wave refraction survey using ‘Land Streamer’

Summary In order to found abandoned air-raid shelters in urban area, high resolution S-wave refraction survey was conducted. We used ‘Land Streamer’ because the condition of ground is paved in street. Using ‘Land Streamer’ on paved ground allows to get seismic data which is little affected by static correction. In addition, acquired data is higher ratio signal to noise than using clay or tripod. We processed the data and interpreted the profile. We picked up the potential points under where the abandoned shelters exist. As a result of drilling on the selected points, it was found that the abandoned shelters exist.