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| | Abstract | | We conducted high-resolution shallow seismic reflection survey at Ikinomatsubara area, Fukuoka City to image shallow basement structure. Two about 600m-long S-wave seismic lines were set along the coastal line. One is in pine tree forest and the other is just outside the forest and about 20m from the coastal line. The distance between the two lines is about 50m. As a result, CMP depth sections profiled several continuous reflection events at the near surface. They also profiled fault like character. Comparison with the drilled core data obtained at GS-IKM-1 site, which is just at the north-east end of the Line1, shows about 5m shift with two strong reflection events (should be 8.0m and 20.4m in depth). The profiles still have surface statics and noises caused by strong direct wave/ Surface wave. We still need to suppress these noises to have a good image of the basement. |
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