日本地すべり学会誌　第４３巻　第３号(通巻第１７３号)
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タイトル 著者 ページ
＜口絵写真＞
■２００６（平成１８）年５月１３日岐阜県揖斐川町で発生した東横山地すべり
■２００６年７月長野県天竜川上流域で発生した豪雨災害
■秩父帯の粘板岩と蛇紋岩のすべり面
＜巻頭言＞
■課題の克服と学会のイノベーション		 丸井英明 1
＜論文＞
■ＣＩＶＡ―安定化有限要素法による地すべりを起因とする造波解析		 吉松弘行・樫山和男 3
■新潟県中越地震における斜面崩壊の特徴と分布 関口辰夫・佐藤　浩 14
＜報告＞
■新第三紀層分布域における地震の震度と地すべりの地形・地質的特徴		 阿部真郎・高橋明久・荻田　茂・小松順一・森屋　洋・吉松弘行 27
＜ニュース＞
■２００６（平成１８）年５月１３日岐阜県揖斐川町で発生した東横山地すべり		 河合成司・岡田藤博・吉田宇男・木下慎逸 35
■２００６年７月長野県天竜川上流域で発生した豪雨災害 北澤秋司・飯沼達夫・三上幸三・松下泰見・平沢　清・新屋浩明 39
＜講座＞
■現場で役に立つ地すべり工学　第８回（４．監視と予測）		 木村隆俊・横山　昇 44
＜シリーズ＞
■目で見るすべり面シリーズ−２８−（秩父帯の粘板岩と蛇紋岩のすべり面）		 原田敏雄・浜口洋介・竹原哲郎・森本剛正 52
＜学会活動報告＞ 55
会告
 
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Journal of the Japan Landslide Society:Vol.43, No.3, 173
（September, 2006）
Contents

Subject Author page
Pictorials 　 　
<Foreword>
■Innovation in the Society's activities to accomplish tasks		 Hideaki MARUI 1
<Original articles>
■Analysis of water waves due to landslide by CIVA‐stabilized finite element method		 Hiroyuki YOSHIMATSU and Kazuo KASHIYAMA 3
■Feature and distribution of landslides induced by the Mid Niigata Prefecture Earthquake in 2004, Japan Tatsuo SEKIGUCHI and Hiroshi P. SATO 14
<Technical report>
■Seismic intensity and geomorphological/geological feature of landslides due to earthquakes in the area of Tertiary strata in Japan		 Shinro ABE, Akihisa TAKAHASHI, Shigeru OGITA, Jun‐ichi KOMATSU, Hiroshi MORIYA and Hiroyuki YOSHIMATSU 27
<News>
■Higashiyokoyama landslide in Ibigawa City, Gifu Prefecture on May 13, 2006		 Seiji KAWAI, Takao YOSHIDA, Fujihiro OKADA and Shinichi KINOSHITA 35
■A report on the July, 2006 Heavy rainfall disaster at Tenryu upper reaches, Nagano Prefecture, Japan Shuji KITAZAWA, Tatsuo IINUMA, Kozo MIKAMI, Yasumi MATSUSHITA, Kiyoshi HIRASAWA and Hiroaki SHINYA 39
<Lecture>
■Key points in field work for landslide engineers No. 8		 Takatoshi KIMURA and Noboru YOKOYAMA 44
<Series>
■Sliding surfaces observed by eye-28-(Slip surface formed on slate and serpentinite in the Chichibu Terrane)		 Toshio HARADA, Yousuke HAMAGUCHI, Tetsurou TAKEHARA and Kousei MORIMOTO 52
<Society's activities>
<Notice board>　　

Abstract

ＣＩＶＡ―安定化有限要素法による地すべりを起因とする造波解析
Analysis of water waves due to landslide by CIVA‐stabilized finite element method
吉松弘行a)*･樫山和男b)
Hiroyuki YOSHIMATSU and Kazuo KASHIYAMA
Abstract
Landslide mass inflowing into a reservoir or a bay causes giant wave that brings a greatly serious disaster. The numerical analysis of FEM(Finite Element Method)has been discussed for the shallow water equation to predict the wave's quality. The numerical method of FEM gives rise of the local oscillation due to the convection term. The FEM of SUPG(Streamline Upwind/Petrov‐Galerkin formulation)applied the interpolation function of first order accuracy is discussed to avoid the local oscillations. This paper examines the stabilized FEM of CIVA(Cubic Interpolation Volume/Area Coordinate)method that uses the interpolate function of the third order accuracy in order to more raise the precision. The presented method is compared with the results of previous model experiment and confirms the validity of numerical analysis.
Key words:water wave, landslide, CIVA, stabilized FEM, numerical method

和文要旨
　貯水池や湾内へ急激に突入する地すべり地塊は悲惨な災害をもたらす巨大な造波の原因となり，この造波現象を予測するため，浅水長波式の有限要素法による解析が進められている。有限要素法は移流項の影響で数値計算の数値振動が見られ，このため一次精度の内挿補間による風上手法を用いたＳＵＰＧ法による数値解析が検討されている。更なる解析精度の向上を図るため三次精度の内挿補間を行うＣＩＶＡ法による安定化有限要素法を検討した。提案手法は既往の模型実験結果との比較を行い，解析法の妥当性を確認した。
キーワード：造波，地すべり，ＣＩＶＡ，安定化有限要素法，数値解析
Feature and distribution of landslides induced
by the Mid Niigata Prefecture Earthquake in 2004, Japan
関口辰夫a)*･佐藤 浩a)
Tatsuo SEKIGUCHI and Hiroshi P. SATO
Abstract
A lot of landslides were triggered by the Mid Niigata Prefecture Earthquake around former Yamakoshi Village in the northern part of Uonuma Hill, Central Japan. We conducted photo‐interpretation by using aerial photographs that were taken after the earthquake. In this study, landslides of 4,438 slopes in total were extracted. The landslides were distributed on the northern side of Higashiyama Hill near the epicenter. The concentration of the landslides occurred in two zones:“The East Landslide Zone"and“The West Landslide Zone"which are located in the Imo River Basin and in the western part of Higashiyama Hill, respectively. The geological formation of where these landslides occurred consists of Tertiary sandstone, mudstone and siltstone layers. Both of the landslide zones, as well as the geological layers, stretch in a NNE―SSW direction. We found out that the dip‐slope type landsides were large‐scale formations and tended to slip towards the direction of the dip. There were three causes of the landslides:the severe motion of the Mid Niigata Prefecture Earthquake, lithology and geological structures and unstable landforms such as landslides and river terraces.
Key words:aerial photo‐interpretation, landslide distribution, landslide zone, earthquake motion, epicenter

和文要旨
　新潟県中越地震によって魚沼丘陵北部の旧山古志村を中心に多数の斜面崩壊が発生した。地震後に撮影した空中写真の判読を行った結果４，４３８の崩壊地を抽出した。崩壊地は，震央に近い魚野川北側の東山丘陵に分布し，芋川流域に沿う東側崩壊密集区域とその西方に位置する西側崩壊密集区域の２つの区域に集中していた。崩壊地の地質は，新第三紀層の砂岩・泥岩・シルト岩の層で北北東−南南西方向の帯状の分布と同方向の背斜軸や向斜軸を有し，大規模な崩壊は地層が傾斜方向へ滑落する流れ盤型の崩壊となる傾向がみられた。斜面崩壊の発生要因として，直下型の激しい地震動，軟弱な地質と地質構造，地すべり地や河岸段丘などの崩壊しやすい不安定な地形の存在が推定された。
キーワード：空中写真判読，斜面崩壊分布，崩壊密集区域，地震動，震央