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| | Abstract | | We conducted a shallow seismic reflection survey along NE-SW coastal line at the Kujukuri coastal plain (Asahi city, Yasashigaura), Chiba Prefecture, central Japan. The seismic source is a P-wave Yuatsu impactor, station interval is 2m, the maximum source-receiver offset is 382m and the survey line is 7km long. In vertical stacked and gained shot records, first breaks reach the maximum offset with 1.6km/s apparent velocity and reflection waves are recognized down to 900ms in two way time. In preliminary CMP stacked time section by simple data processing, uneven reflectors of alluvial sediments are imaged in the shallowest part at several ten ms, and dipping reflectors of Kazusa group and pre-Tertiary basement top are perceived bellow them. Reflectors deeper than 700m are recognized by simple survey system of single receivers. |
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