研究者詳細 - 渡辺　俊樹

論文 - 渡辺　俊樹

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Continuous Active Seismic Observation using ACROSS Source and Seismometer Array 査読有り

Watanabe, T., Ikuta, R., Yamaoka, K., Soma, T. and Fujii, N.

Proceedings of the 8th SEGJ International Symposium -Imaging and interpretation- 頁： 369 - 372 2006年

担当区分：筆頭著者記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）

A team in Nagoya University has been extensively working on developing Accurately-Controlled Routinely-Operated Signal System (ACROSS) in order to monitor temporal variations in the subsurface properties. Continuous transmission of a controlled seismic signal from the seismic ACROSS source and the long-term observation of the waves propagating through the deeper crust and the plate boundary enable us to understand the time-variable phenomena such as slow-slip and deep tremor and to monitor the state of the plate boundary. We deployed a short-spam seismometer array in the "Aichi Prefectural Forest Park" in defunct Hourai Town (presently Shinshiro City) in eastern Aichi. The array, composed of 12 stations, is about 2 km wide in NS and 1 km wide in EW. The observation started from November, 2004 and terminated at the end of September, 2005. The seismic ACROSS source located at Toki has been operated to generate FM signal from 10 to 20 Hz in 50 seconds of period during the continous observation. After one or two weeks of data stacking, signals with a good S/N ratio were obtained using the surface seismometers, which is comparable to the data of the Hi-Net station deployed in a borehole. The transfer function clearly shows the P-wave, S-wave and their after-phases, having good correlation with the Hi-net data. A semblance analysis of array data shows the estimation of the azimuth and dip of the wave propagation and the apparent slowness. The waveform of after-phases, supposed to the reflected phase from the plate boundary, shows temporal changes during observation. Detailed analysis is underway, however, a possible explanation may be a correlation to the activity of deep low-frequency tremors in Tokai region.

DOI： 10.1190/segj082006-001.74

南海トラフ沈みこみ帯の地殻比抵抗構造査読有り

木村俊則, 芦田讓, 後藤忠徳，笠谷貴史, 三ケ田均, 真田佳典, 渡辺俊樹, 山根一修

物理探査 58 巻 ( 3 ) 頁： 251 - 262 2005年8月

口永良部島火山における人工地震探査 : 探査の概要と初動の走時について

井口正人, 山本圭吾, 橋本武志, 筒井智樹, 田中聡, 鬼澤真也, 青木陽介, 渡辺俊樹, 大倉敬宏, 清水洋, 八木原寛, 宮町宏樹, 平松秀行, 為栗健, 高山鉄朗, 福嶋麻沙代, Hetty Triastuty, 石原和弘, 大島弘光, 鈴木敦生, 前川徳光, 梶井達矢, 渡辺義明, 荻原庸平, 野上健治, 及川光弘, 平林順一, 辻浩, 平田安廣, 奥田隆, 伊藤拓, 吉川慎, 井上寛之, 池田さや香, 堀美緒, 斎藤政城, 平野舟一郎, 上釜友大, 井口元冶, 竹下孝弘, 森健彦

京都大学防災研究所年報 48 巻 ( B ) 頁： 297 - 322 2005年4月

Preliminary assessment of the waveform inversion method for interpretation of cross-well seismic data from the thermal production test, Mallik Gas Hydrate Production Research Well 査読有り

Watanabe, T., Shimizu, S., Asakawa, E., Kamei, R. and Matsuoka, T.

Scientific Results from Mallik 2000 Gas Hydrate Production Research Well Program, Mackenzie Delta, Northwest Territories, Canada, Geological Survey of Canada, Bulletin, 585 巻 2005年

口永良部島火山における人工地震探査 : 探査の概要と初動の走時について査読有り

地震研究所彙報 80 巻 ( 1 ) 頁： 11 - 40 2005年

Differential waveform tomography for time-lapse crosswell seismic data with application to gas hydrate production monitoring 査読有り

Watanabe, T., Shimizu, S., Asakawa, E., Matsuoka, T.

Expanded Abstract of the 74th Annual Meeting, Society of Exploration Geophysicists 頁： TOM1.1 2004年10月

担当区分：筆頭著者記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）

To detect the change of physical properties in small areas, a series of high-resolution waveform inversions is applied to time-lapse seismic data. A procedure by use of ifferentiation between the time-lapse data and normalization using reference data is proposed in this study. The procedure is derived as a straightforward extension of waveform inversion as the scatterer imaging. Through numerical tests, the proposed approach was found to be more accurate than the conventional approach in obtaining the velocity change in small areas. The method was applied to the time-lapse crosswell seismic data obtained during the Mallik 2002 gas production test. A small area showing a velocity decrease near the production zone were found using the proposed method, indicating the existence of dissociated methane gas in the sand layers.

DOI： 10.1190/1.1845221

フルウェーブ・インバージョン査読有り

渡辺俊樹

非破壊検査 53 巻 ( 5 ) 頁： 274 - 279 2004年

人工地震を用いた富士山における構造探査

及川純, 鍵山恒臣, 田中聡, 宮町宏樹, 筒井智樹, 池田靖, 潟山弘明, 松尾のり道, 西村裕一, 山本圭吾, 渡辺俊樹, 大島弘光, 山崎文人

月刊地球号外No. 48 巻頁： 23 - 26 2004年

Viscoacoustic wave form inversion of transmission data for velocity and attenuation 査読有り

Watanabe, T., Nihei, K. T., Nakagawa, S., Myer, L. R.

Journal of Acoustical Society of America 115 巻 ( 6 ) 頁： 3059-3067 2004年

担当区分：筆頭著者記述言語：英語掲載種別：研究論文（学術雑誌）

This study investigates the performance of a frequency domain viscoacoustic full waveform nonlinear inversion to obtain high resolution images of velocity and attenuation. An efficient frequency domain implementation is applied that consists of performing a series of single frequency inversions sweeping from low to high frequency. A cascaded inversion was adopted in which the real part of the velocity is first imaged using the phase information, then the quality factor (Q) is imaged using the amplitude information. Tests with synthetic data indicate that our approach yielded better images than the simultaneous determination of the real and imaginary part of the complex velocity. The method is applied to laboratory data obtained in a water tank with suspended acrylic bars. Broadband 200 kHz data is obtained for a crosshole configuration with a computer-controlled scanning system and piezofilm source and detector. The velocity image produced by the full waveform inversion is compared to a curved ray traveltime tomography velocity image, and was observed to possess higher resolution and more precise locations of the acrylic bars. The Q image shows a lower resolution than the velocity image, but recovers the correct Q for acrylic. This method can be applied for geophysical applications targeted to soil, unconsolidated rocks and marine sediments and also nondestructive evaluation and medical applications.

DOI： 10.1121/1.1710878

地震計アレイによる2.4km離れたACROSS震源からの弾性波の走時変動連続観測

雑賀敦, 山岡耕春, 國友孝洋, 渡辺俊樹

月刊地球号外No. 46 巻頁： 105 - 112 2004年

物理探査におけるアクティブ・モニタリング

渡辺俊樹

月刊地球号外No. 46 巻頁： 166 - 172 2004年

P-S converted seismic waves by a fracture and imaging 査読有り

Sanada, Y., Watanabe, T., Kiriyama, A., Ashida, Y.

ISRM 3rd Asian Rock Mechanics Symposium (ARMS) 1 巻頁： 261 - 264 2004年

周波数領域波形インバージョンによる孔間室内実験データの速度と減衰のイメージング査読有り

渡辺俊樹, Nihei, K. T., Nakagawa, S. and Myer, L. R.

物理探査 56 巻 ( 2 ) 頁： 97 - 105 2003年6月

Seismic imaging ahead of tunnel face with three-component geophones 査読有り

Ashida, Y., Matsuoka, T., Watanabe, T. and Kusumi, H.

Environmental Rock Engineering 頁： 371 - 375 2003年

High resolution imaging of crosshole data using waveform inversion and reverse-time imaging 査読有り

Watanabe, T., Nihei, K. T., Nakagawa, S. and Myer, L. R.

Environmental Rock Engineering 頁： 317 - 322 2003年

Simulation of Hopkinson effect by discrete element method 査読有り

Matsuoka, T., Kusumi, H., Ashida, Y. and Watanabe, T.

ISRM 2003 - Technology roadmap for rock mechanics - 頁： 813 - 816 2003年

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