掲載雑誌（和）：
岩盤力学に関するシンポジウム講演論文集
Vol：
25巻
年：
1993年
頁：
281-285頁
著者（和）：
ラナジット・ゴーシュ， 長田 正樹， 若林 成樹， 木下 直人
タイトル（和）：
岩盤の異方性によるS波スプリッティングの検出 −割れ目の卓越方向推定に関する基礎実験結果−
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抄録（和）：
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キーワード（和）：
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掲載雑誌（英）：
PROCEEDINGS OF THE SYMPOSIUM ON ROCK MECHANICS
著者（英）：
Ranajit GHOSE, Masaki OSADA, Naruki WAKABAYAHSHI, Naoto KINOSHITA
タイトル（英）：
EVIDENCE OF SHEAR-WAVE BIREFRINGENCE FROM SHALLOW VSP DATA - A ROBUST TECHNIQUE TO DEDUCE CRACK ORIENTATION PROFILE-
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抄録（英）：
A salient seismic feature of fracture-related rock structure is the effective shear-wave anisotropy manifested in the form of 'birefringence' or 'shear-wave splitting'. In this paper, we report the preliminary results of delineating the depth varying polarization direction of shear waves from a shallow vertical seismic profiling experiment conducted at a hard rock area We have developed a new algorithm for estimating systematically the polarization azimuth of the split shear waves observed at a regular depth interval by a downhole three-component seismometer with fixed orientation. The technique does not assume orthogonality of the split shear waves. The processing results in clear decoupling of energy between the reception coordinates, and consequently a notable improvement in the alignment of phase arrival. The estimated polarization azimuth of the fast-split shear wave varies from northwest at shallow depths, to north to northeast below about 30m. The interpreted profile exhibits excellent correlation with that obtained by actual measurement of strike of the open cracks from borehole TV images and core samples, even in scales of a few meter.
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キーワード（英）：
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記事区分：
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委員会論文集