巻号一覧
37 巻, 3 号
選択された号の論文の6件中1～6を表示しています
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鈴木 一成, 武藤 章, 後藤 典俊, 横山 光一1996 年 37 巻 3 号 p. 150-159
発行日: 1996/08/10
公開日: 2010/02/23
ジャーナル フリーIt was often reported that a liquefaction in sand layers induced by the earthquake caused severe damages to the constructions on the earth's surface. Therefore, the potential map of liquefaction is important for the reduction of disaster.
In this study, we estimated the liquefaction potential considering a seismic intensity, and applied this new index to the evaluation of the liquefaction potential in the area of Noboribetsu City, Hokkaido.
As a first step, the liquefaction potential was separately calculated using both methods proposed by KAGAMI and OHTA (1984) for Kawasaki City and SEED et al. (1985), and both results were compared each other. Next, the intensity difference was obtained from the method proposed by OHTA et al. (1979), which was based on a questionnaire survey. Finally, combining the above mentioned first and second step, we determined the new index for the liquefaction potential considering the seismic intensity.
Through our study, we found the following results;
1) Comparing the liquefaction potentials by the methods of SEED et al. (PL-value) and KAGAMI and OHTA, both estimations showed a similar tendency. However, each values for four ranks estimated by both methods did not correspond, and the PL-value always became higher.
2) The ranking classification using the new index, which obtained as a weighted summation of the liquefaction potential and the intensity difference, was effective to evaluate the liquefaction potential considering a seismic intensity for Noboribetsu City.抄録全体を表示PDF形式でダウンロード (2049K) -
林 愛明, 宇田 進一1996 年 37 巻 3 号 p. 160-171
発行日: 1996/08/10
公開日: 2010/02/23
ジャーナル フリーWe propose a tectonic model associated with formation of the Akashi strait. The epicentral distribution of aftershocks and geodetic data show that the earthquake rupturing occurred not only along the Nojima Earthquake Fault and the Rokko Fault Zone striking NE-SW, but also occurred along the faults striking NW-SE in the Akashi strait. The earthquake surface ruptures striking NW-SE and NE-SW were also found in the northwestern end area of Awaji Island. The vertical displacements along these surface ruptures and the GPS data measured on the piers of Akashi strait bridge indicate that the central part of the Akashi strait subsided a few tens of cm among the 1995 Southern Hyogo Prefecture Earthquake. Based on these data, we show that the Akashi strait is a pulling-apart area between the right-lateral strike-slip faults of the Rokko Fault Zone and the Nojima Earthquake Fault, and that the Rokko-Awaji mountains are the areas showing the character of pressure ridge formed by pushing-up.抄録全体を表示PDF形式でダウンロード (5965K) -
放射性廃棄物の地層処分を対象として高橋 洋1996 年 37 巻 3 号 p. 172-182
発行日: 1996/08/10
公開日: 2010/02/23
ジャーナル フリーThe multibarrier system for deep geologic disposal of high-level, long-lived and heat generating radioactive waste has been devised in order to keep them away from humanbeing. This system consists of engineering barrier and geological natural barrier. After burying the waste, an “artificial geothermal system” may be constructed because of heat from radioactive waste, and the artificial geothermal system would make some hydrothermal minerals and alteration zone, in host rocks.
Hosokura ore deposits were made by an “old geothermal system”, and have impermeable zones developed along some ore veins. In some active geothermal area in Japan, geothermal alteration zones seem to play as caprocks. That is, a part of geothermal alteration zones sometimes work as hydraulic barrier (alteration barrier), which is very important for hydrology of that area. In this paper, the possibility about formation of the “artificial alteration zone” at geologic disposal is considered.
Smectite, α-cristobalite, clinoptilolite, mordenite and stilbite are possibly formed by the interaction between neutral hot water and volcanic glass at temperatures below 100°C in an artificial geothermal system. These minerals have high adsorption capacity of radionuclides and low permeability. Because of these properties, the alterative minerals may form an “alteration barrier” which supports the multibarrier system.
Nowadays, a large amount of bentonite is necessary for buffer and backfill material. Mixing volcanic glasses with bentonite may reduce the amount of bentonite, because volcanic glasses may change to smectite and form a part of alteration barrier in a long time.抄録全体を表示PDF形式でダウンロード (1842K) -
田結庄 良昭, 藤田 智子1996 年 37 巻 3 号 p. 183-193
発行日: 1996/08/10
公開日: 2010/02/23
ジャーナル フリーPDF形式でダウンロード (3471K) -
豊蔵 勇, 岡田 篤正1996 年 37 巻 3 号 p. 194-200
発行日: 1996/08/10
公開日: 2010/02/23
ジャーナル フリーPDF形式でダウンロード (1174K) -
金折 裕司, 川上 紳一1996 年 37 巻 3 号 p. 201-218
発行日: 1996/08/10
公開日: 2010/02/23
ジャーナル フリーPDF形式でダウンロード (2979K)
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