応用地質

火山性地域における斜面崩壊予測のための地質要因の評価

地盤数値情報データベースを用いた解析

田尻要, 中山洋, 荒牧昭二郎, 今泉繁良

1996 年 37 巻 5 号 p. 374-383
発行日: 1996/12/10
公開日: 2010/02/23

DOIhttps://doi.org/10.5110/jjseg.37.374

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The engineering objective of statistical evaluation of factors concerning slope failure is to predict failure zones of a particular region by referring to the result of the case study analyses. Therefore, while generalizing those factor categories, maintaining high degree of universality in such evaluations is indispensable. Especially in geological factors, it is vitally important to consider this sufficiency. In this respect, our reserch is aimed at examining the applicability of the intermediate classification of geological factors in statistical analysis and its adequacy as an evaluation tool. Comparison of each analysis based on both minor and intermediate classifications is made, applying quantification method II. The results indicate that, (1) as far as multivariate analysis in slope failure is concerned, the intermediate classification of geological factors is very much justified from a view point of generality in classification and universality in analytical evaluation; and (2) in regions with geological features containing fairly large lava boulders, a classification that takes into account the formation process may be indispensable.

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The Application of the VLF-MT Survey to Volcanic Structure

The Structure and Origin of Conical Hills on Nirasaki Mudflow, Japan

Hideo KASAI

1996 年 37 巻 5 号 p. 384-395
発行日: 1996/12/10
公開日: 2010/02/23

DOIhttps://doi.org/10.5110/jjseg.37.384

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山梨県の八ヶ岳の南西麓に分布する韮崎火砕流台地上の小円丘の構造を調べるためにVLF探査を実施した. 調査地域は小円丘の1つである新府城で, 露頭が存在しない. 50mの測点間隔で測線に沿って, 見掛け比抵抗, 位相角, 電場強度, 磁場強度を測定した.
VLFデータを2層構造と仮定して, 位相角分布と比抵抗分布から求めたモデルに従って解析し, 以下の結果を得た. 上位層は700から1000Ωmの比抵抗を有する小円丘を構成する層で, 下位層は250Ωm程度の比抵抗の韮崎台地を形成する層である. 下位層は台地を形成する凝灰角礫岩である. 上位層は比抵抗からみて凝灰角礫岩であろうと考えられる. また, 小円丘の頂部の北部に岩脈と推定される高比抵抗部がみられる. これらの構造は新府城が泥流丘よりもむしろ小規模な火山として形成されたものであることを示唆する.

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地震による建築物被害分布の平均化の方法とその意義

1995年兵庫県南部地震を例として

黒木貴一, 秋山一弥, 脇坂安彦

1996 年 37 巻 5 号 p. 396-409
発行日: 1996/12/10
公開日: 2010/02/23

DOIhttps://doi.org/10.5110/jjseg.37.396

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Basic problems of a distribution map of the damaged area, caused by an earthquake are the influence of vacant areas of buildings and the strength of extraordinary of buildings in initial distribution maps for each building. We need to remove them to assess the distribution of damaged area by averaging the distribution of each damaged building.
In this study, we discussed the counter method for averaging the distribution. In general, a counter method is a method to make a contour map of separate planes like a bedding plane using a circle window. In this study, a square window is employed as a counter. The method consists of 7 rules for drawing reasonable boundary lines of selected main damaged areas. Because the counter size affects the figure of the boundary line of damaged areas, we must select a suitable counter size for averaging the distribution of damaged buildings. We observed the distribution maps made by various size counter, and compared between the maps and geomorphological maps.
In the case of the distribution map of damaged buildings caused by the 1995 Hyogo-ken Nanbu Earthquake, we could remove the influence of vacant areas and extraordinary buildings by the counter method. Furthermore, averaging a distribution map of damaged areas by the above method clarified our understanding of the relationships between geomorphological and/or geological factors and earthquake hazards.
These results show that the counter method is useful for averaging a distribution map of damaged area.

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広島県西部, 花崗岩中の断層破砕帯に生成している粘土鉱物のK-Ar放射年代

北川隆司, 西戸裕嗣, 井上基, 門藤正幸

1996 年 37 巻 5 号 p. 410-414
発行日: 1996/12/10
公開日: 2010/02/23

DOIhttps://doi.org/10.5110/jjseg.37.410

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野島地震断層梨本地点のアフタースリップの再検討

林愛明, 宇田進一, 宮田隆夫, 大槻憲四郎, 皆川潤

1996 年 37 巻 5 号 p. 415-419
発行日: 1996/12/10
公開日: 2010/02/23

DOIhttps://doi.org/10.5110/jjseg.37.415

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Afterslip is the growth of slip on a surface fault at a decaying rate following co-seismic subsurface rupture. Continual measurements of surface slip have been made across the trace of the Nojima Earthquake Fault on the Nashimoto location during 19 January, 1995 to 10 May, 1996, for determining whether afterslip was occurring or not following the main shock. The observed results show that the afterslip was not been detected, which coincides with the previous observation made by GPS and laser wave.

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訂正

1996 年 37 巻 5 号 p. 431a
発行日: 1996年
公開日: 2010/02/23

DOIhttps://doi.org/10.5110/jjseg.37.5_431a

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1996 年 37 巻 5 号 p. 431b
発行日: 1996年
公開日: 2010/02/23

DOIhttps://doi.org/10.5110/jjseg.37.5_431b

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