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発表 Seismic Reflection Surveys Using an SH-wave-type Vibrator Across Active Faults

作成年度 2012 年度
論文名 Seismic Reflection Surveys Using an SH-wave-type Vibrator Across Active Faults
論文名(和訳)
論文副題
発表会 The 74th EAGE Conference and Exhibition incorporating SPE EUROPEC 2012
誌名 Proceedings of the EAGE Conference
巻・号・回 74
発表年月日 2012/06/01
所属研究室/機関名 著者名(英名)
Geological Hazards Research Team, Cold-Region Construction Engineering Research GroupT. Kurahashi
Geology and Geotechnical Engineering Research GroupTomio Inazaki
抄録
This paper describes the results of seismic reflection surveys conducted using a horizontally polarized shear (SH) wave-type vibrator. In the study, post-migrated CMP profiles of seismic reflection processing were produced to characterize subsurface structures across both the Asahiyama flexure and the Kozu-Matsuda fault. The throw of the top reflector enabled estimation of the cumulative vertical offset in the bedrock across the fault, and refraction tomography processing also revealed the SH wave velocity structure across it. The velocity structure in the subsurface around the fault decreased to 300 or 500 m/s. This was considered to be the result of unfavorable geological conditions with a low shear modulus. Against this background, SH-wave seismic reflection surveys are strongly expected to be very useful for acquiring images of bedrock across active faults, approximating the depth of bedrock, and identifying dataset signal anomalies that may indicate unfavorable geological conditions. These benefits are owed to the lower speed and shorter wavelength of SH waves.
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