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： 21巻 年： 1989年 頁： 141-145頁 著者（和）： 服部　弘通，　川上　純，　下茂　道人，　青木　智幸，　田中　重明，　亀村　勝美 タイトル（和）： モルタルブロックを用いたジオトモグラフィーの基礎実験 抄録（和）：
- キーワード（和）： - 掲載雑誌（英）： PROCEEDINGS OF THE SYMPOSIUM ON ROCK MECHANICS 著者（英）： Hiromichi HATTORI, Jun KAWAKAMI, Michito SHIMO, Taomoyuki AOKI, Shigeaki TANAKA, Katsumi KAMEMURA タイトル（英）： LABORATORY EXPERIMENT ON GEOTOMOGRAPHY USING CEMENT MORTAR BLOCK 抄録（英）：
A series of laboratory measurements had been conducted to investigate the feasibility of the seismic tomography technique . The main purpose of this experiment is to investigate how the accuracy of the reconstructed velocity profile depends on the degree of velocity contrast in the field. The initial arrival time of the seismic wave was measured along the 324 scan lines on the cement mortar block of 50 x 50 x 3cm in which simulated low velocity zone was casted. The velocity ratio between these two zones were V■/V■ = 0.89, 0.78 and 0.53, respectively. The results show that when the velocity contrast is large (V■/V■ = 0.53), the calculated velocity profile by inversion is heavily distorted from the original profile. This is thought to be due to mainly two reasons. One is the measurement error which is caused by the fact that the first arrival waves passing near the low velocity zone are mainly diffraction waves showing very low signals on the measured data. The other reason is the fact that the only few wavn transmit through the low velocity zone so that relatively small information on this zone is available. It is recommended to take these problems into consideration when one would conduct field geotomography survey. キーワード（英）： - 記事区分： - 区分 　　　委員会論文集