| 講演要旨(和文) | | 海陸境界域を含む長大稠密展開を伴う反射法・屈折法統合データに関して、Full Waveform Inversion(FWI)の適用による短波長構造不均質を伴う速度情報抽出と共に、高精度重合前深度マイグレーション適用に関わるワークフローを構築した。さらに、国内における深部地殻構造探査データを対象事例として、多様な速度推定情報の複合化を実施すると共に、推定された速度構造の不均質と深部反射波イメージングの解像度について議論を行った。 |
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| | 講演要旨(英文) | | Deep seismic reflection profiling across the area of land-marine transition zones in Japan has been imposed a number of restrictions and compromises on enhanced seismic imaging with broadband processing. In our study, multilateral approach beyond the conventional CMP stack is applied to the multi-scale, multi-mode seismic data for the extraction of deep reflection patterns. In order to build high-resolution velocity structure, we developed a processing workflow based on the hybrid approach of reflection velocity analysis and turning-ray tomography followed by full-waveform inversion. We evaluated the relation between reconstructed velocity heterogeneity and reliable low-frequency component using both synthetic seismograms and typical multi-scale deep reflection data acquired in the northeast Japan. |
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