Kyoji Sassa

University of Campania "Luigi Vanvitelli"

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Hiroshi Fukuoka

Niigata University

Gonghui Wang

Kyoto University

Fawu Wang

Tongji University

Khang Dang

VNU University of Science

Doan Huy Loi

Kyoto University

Kaoru Takara

National Research Institute for Earth Science and Disaster Resilience

Kazuo Konagai

The University of Tokyo

Paolo Canuti

University of Florence

Ivan Gratchev

Griffith University

Gen Furuya

Toyama Prefectural University

Cooperative Institutions

Kyoto University

Prevention Institute

National Research Institute for Earth Science and Disaster Resilience

Forestry and Forest Products Research Institute

University of Rijeka

Niigata University

The University of Tokyo

Nippon Koei (Japan)

Institute of Transport Science and Technology

University Of Transport Technology

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Mechanism of Rapid Long Runout Motion in the May 1997 Sumikawa Reactivated Landslide in Akita Prefecture and the July 1997 Harihara Landslide-Debris Flow, Kagoshima Prefecture, Japan

Landslides (1998)

Kyoji Sassa Hiroshi Fukuoka Fawu Wang

Two disastrous long runout rapid landslides caused big disasters in Japan, 1997. One is a reactivated type landslide which traveled over 1.5 km in Akita Prefecture. Another is a rapid landslide-debris flow which killed 21 persons living on a debris fan in Kagoshima Prefecture. The authors took samples in both landslides and simulated the stress condition at the initiation of landslide motion by the stress control ring shear apparatus. The test results suggested that the sliding surface liquefaction of the saturated andesitic debris in both landslides played a key role for the rapid long runout landslide motion. One of the remarkable test results is that the andesitic debris showed a low apparent friction angle of about 5 degrees after failure even in the drained state of shear box and during gradual increase of pore pressure. Excess pore pressure generation in the shear zone after failure was much greater than the pore pressure dissipation, and the permeability in the shear zone was much decreased due to grain crushing by shearing.

Debris flow

Shearing (physics)

10.3313/jls1964.35.2_29

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Citations (7)

Contribution of the International Consortium on Landslides to the implementation of the Sendai Framework for Disaster Risk Reduction: engraining to the Science and Technology Roadmap

Landslides (2020)

Irasema Alcántara-Ayala Kyoji Sassa

Disaster risk reduction

Promotion (chess)

10.1007/s10346-020-01539-8

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Citations (16)

The Relationship Between Underground Erosion and Landslide Movement in a Crystalline Schist Landslide, Zentoku, Tokushima, Japan

Landslides (1997)

Gen Furuya Kyoji Sassa Hiroshi Fukuoka Hiromasa Hiura

The authors have thought that one of the most effective factors on the movement of a large crystalline schist landslide “Zentoku” in TokushimaPrefecture, Japan is the underground erosion, and have monitored the sediment discharge due to the erosion and subsequent transportation by the ground water at spring point in there. This paper aims to reveal the relationship between underground erosion and landslide movement on the basis of the monitoring results by the apparatus to catch the sediment, the extensometers and the rain gauge.Due to the results of the preceding monitorings, the sediment discharge is roughly proportional to the precipitation. However, sediment data scatter, which seems due to the factor other than the precipitation. In order to examine the condition of the sediment yield, the authors have induced two parameters, one is the displacement ratio (D/DAVn) to evaluate the degree of landslide movement and the other is the sediment discharge ratio (W/WP) to evaluate the degree of the sediment discharge affected by the factor other than the precipitation. The relationship between the discharge sediment and the landslide movement, which based on the result of the time dependent analysis of these two parameters, leads to the following conclusions;(1) Undoubtedly the precipitation is the most effective factor on the sediment discharge. The landslide movement affects the sediment discharge as the subsequent factor, which causes the scattering of data on the sediment discharge versus precipitation diagram.(2) According to the relationship between the landslide displacement under active period (D/DAVn>2) and the sediment discharge ratio (W/WP), the sediment discharge at the spring point has two factor groups, first group is under the effect of precipitation and the second is affected by the precipitation and the landslide movement itself. The sediment discharge, which produced one month after the active period of the slide, shows good proportionality to the landslide displacement.

10.3313/jls1964.34.9

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Citations (3)

Assessment of Landslide Susceptibility Using Multivariate Logistic Regression: A Case Study in Southern Japan

Environmental and Engineering Geoscience (2007)

H.B. WANG Kyoji Sassa Weiya Xu

Research Article| May 01, 2007 Assessment of Landslide Susceptibility Using Multivariate Logistic Regression: A Case Study in Southern Japan H.B. WANG; H.B. WANG 1School of Civil Engineering and Mechanics, Huazhong University of Science and Technology, Wuhan 430074, P. R. China, and Disaster Prevention Research Institute, Kyoto University, Gokasho, Uji, Kyoto 611-0011, Japan Search for other works by this author on: GSW Google Scholar K. SASSA; K. SASSA 2Disaster Prevention Research Institute, Kyoto University, Gokasho, Uji, Kyoto 611-0011, Japan Search for other works by this author on: GSW Google Scholar W.Y. XU W.Y. XU 3Geotechnical Institute of Hohai University, Nanjing 210098, P. R. China Search for other works by this author on: GSW Google Scholar Author and Article Information H.B. WANG 1School of Civil Engineering and Mechanics, Huazhong University of Science and Technology, Wuhan 430074, P. R. China, and Disaster Prevention Research Institute, Kyoto University, Gokasho, Uji, Kyoto 611-0011, Japan K. SASSA 2Disaster Prevention Research Institute, Kyoto University, Gokasho, Uji, Kyoto 611-0011, Japan W.Y. XU 3Geotechnical Institute of Hohai University, Nanjing 210098, P. R. China Publisher: Association of Environmental & Engineering Geologists First Online: 09 Mar 2017 Online ISSN: 1558-9161 Print ISSN: 1078-7275 © 2007 Association of Engineering Geologists Environmental & Engineering Geoscience (2007) 13 (2): 183–192. https://doi.org/10.2113/gseegeosci.13.2.183 Article history First Online: 09 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation H.B. WANG, K. SASSA, W.Y. XU; Assessment of Landslide Susceptibility Using Multivariate Logistic Regression: A Case Study in Southern Japan. Environmental & Engineering Geoscience 2007;; 13 (2): 183–192. doi: https://doi.org/10.2113/gseegeosci.13.2.183 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyEnvironmental & Engineering Geoscience Search Advanced Search Abstract Landslides are one of the major hazards in large parts of Japan, especially in hilly and mountainous terrains. To minimize the loss of lives and damage to property, factors causing unstable slope conditions should be understood so that we can determine landslide susceptibility with high accuracy and reliability. The purpose of this study is to evaluate landslide susceptibility using multivariate statistical methods and Geographical Information System (GIS) analyses. The Minamata area of southern Kyushu Island of Japan was chosen for this study. This area has experienced repeated landslide activity, including a disastrous one in July 2003. Within this area, we compiled a landslide inventory using aerial photographs and constructed a geospatial database of geology (lithology), topography, soil, and land use/cover. This study documents the relationship between environmental factors and landslide occurrence. A logistic regression was performed to relate independent variables of lithology, slope gradient, aspect, elevation, soil, and land use/cover, to the absence or presence of landslide deposits and landforms. The derived regression model was adopted to evaluate landslide susceptibility in the study area. The spatial probability of landsliding, categorized as very low, low, medium, and high, is portrayed as a landslide susceptibility map with a 25-m-grid cell resolution. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.

10.2113/gseegeosci.13.2.183

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Citations (6)

A new high-stress undrained ring-shear apparatus and its application to the 1792 Unzen–Mayuyama megaslide in Japan

Landslides (2014)

Kyoji Sassa Khang Dang Bin He Kaoru Takara Kimio Inoue

Christian ministry

10.1007/s10346-014-0501-1

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Citations (66)

Cyclic Shear Strength of Soil with Different Pore Fluids

Journal of Geotechnical and Geoenvironmental Engineering (2013)

Ivan Gratchev Kyoji Sassa

The effects of pore water chemistry on the cyclic behavior of fine-grained soil were examined by performing undrained cyclic ring-shear tests on a natural soil treated with solutions of sulfuric acid (H2SO4), sodium hydroxide (NaOH), and sodium chloride (NaCl). In addition, different amounts of the chemicals were used to clarify the influence that ion concentrations in the pore fluid can have on the cyclic shear strength of soil. The results of laboratory tests indicated that cyclic shear strength was sensitive to changes in the pore fluid composition, and changes in cyclic behavior of soil became more pronounced as the concentration of each chemical increased.

Sodium hydroxide

Shear Strength

10.1061/(asce)gt.1943-5606.0000901

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Citations (19)

Landslide risk evaluation and hazard zoning for rapid and long-travel landslides in urban development areas

Landslides (2004)

Kyoji Sassa Gonghui Wang Hiroshi Fukuoka Fawu Wang Takahiro Ochiai

Natural hazard

10.1007/s10346-004-0028-y

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Citations (113)