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Negi, Tateyuki; Umeda, Koji; Matsuo, Koichi*; Asamori, Koichi
Shadan Hojin Butsuri Tansa Gakkai Dai-117-Kai (Heisei-19-Nendo Shuki) Gakujutsu Koenkai Koen Rombunshu, p.195 - 198, 2007/10
MT survey has been applied to various fields in recent years. It is recognized as effective method to know deep resistivity structure. However, it is difficult to acquire interpretable quality data in highly noisy environments, because natural electromagnetic fields are used in the MT survey. To apply MT survey in such environments, it is important to develop robust stacking method to improve the quality of MT spectrum data. In the last SEGJ conference held in Spring 2007, we have reported effective robust stacking method based on MT reliability index shown in Negi et al (2005). In the fall conference, we report the development of robust smoothing method of MT data to compile with the robust stacking method. As a result of application to poor quality data, it was improved to interpretable quality data in short time. Therefore, it is expected to be effective and practical stacking method for the poor quality data.
Yamada, Nobuto*; Ishigaki, Koichi*; Yamaguchi, Shinji*; Narita, Norifumi*; Matsuoka, Toshiyuki; Hodotsuka, Yasuyuki; Matsuoka, Toshifumi*
Shadan Hojin Butsuri Tansa Gakkai Dai-117-Kai (Heisei-19-Nendo Shuki) Gakujutsu Koenkai Koen Rombunshu, p.146 - 148, 2007/10
Seismic interferometry synthesizes the Green's function between two receivers by calculating cross-correlation of records measured at their locations. In Japan Atomic Energy Agency(JAEA), Seismic Interferometry using blasting vibration caused by the shafts excavation had been carried out to investigate the geologic structure in the surrounding area. The result was identical to the existing seismic reflection section. In this study, we applied this technique to long time measured microtremor. The result was also identical to the results of existing section and seismic interferometry using blasting vibration caused by the shafts excavation.