アナログテープに記録されたシングルチャンネル音波探査データのデジタル化と信号処理
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概要
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The Geological Survey of Japan has been collecting offshore single channel seismic profiling data around Japan for the purpose of compilation of marine geological maps. The maps are generally based on the interpretation of the on board profiles plotted on a graphic recorder. The seismic data has also been recorded on analogue tapes. The author tried to improve the quality of the analogue seismic data by digitizing and signal processing. Digital band-pass filter is very effective to reduce noise, AGC can make clear weak reflections. Spike deconvolution filter shortens reflection waves and contributes to distinguish close reflections. Predictive deconvolution filter can reduces multiple reflections in the shallow area less than 150 m deep, but the filter may also reduces real reflection. Diffraction patterns from dipping strata and faults can be fairly removed by F-K migration. The size and vertical exaggeration of profiles can be easily changed as the interpreter likes. These processed single channel seismic profiles are useful to clarify geologic structures inclined less than 15-20°, and shallower than 1.0 s below sea bottom in the water depths less than 3,000 m. The processed profiles make possible more detailed and reliable geologic interpretation than onboard profiles, although the processing can not show geologic structures which are not observed on the onboard profiles. Single channel seismic data recorded on analog tapes which have been believed to be useless can be improved by digitizing and processing, and the improved profiles can be useful for the study of marine active faults.
- 海洋調査技術学会の論文
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