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Volcaniclastic debris avalanche on Motomachi area of Izu-Oshima, Japan, triggered by severe storm: Phenomenon and mechanisms
Wang, Gonghui1; Jiang, Yao2,4; Chang, Chengrui3; Doi, Issei1; Kamai, Toshitaka1
Corresponding AuthorWang, Gonghui(wanggh@landslide.dpri.kyoto-u.ac.jp)
2019-03-09
Source PublicationENGINEERING GEOLOGY
ISSN0013-7952
Volume251Pages:24-36
SubtypeArticle
Contribution Rank2
AbstractHeavy rainfall and strong wind associated with Typhoon Wipha hit Izu-Oshima Island, Japan, and triggered catastrophic landslides on the western slope of Oshima Volcano on 16 October 2013. These landslides were shallow but large in scale, and the displaced landslide materials were characterized by rapid and long runout movement. A massive landslide resulted in 36 people dead and 3 missing, with 46 buildings being completely destroyed in the downstream area of Motomachi district. To understand the initiation and movement of these shallow landslides, we surveyed the landslide area and found that in addition to heavy rainfall, strong wind may also have played a key role in increasing the instability of the slopes. We took samples from the source areas and examined their static and dynamic shear behaviors under naturally drained or undrained conditions. Test results showed that high pore-water pressure can be built up and maintained within the displaced landslide material and increase landslide mobility, even though the thickness of displaced landslide materials is 0.7-1.2 m. This may then give a rational explanation on the fluidization process of the displaced landslide materials. We also examined the windthrow features of trees subjected to different wind speed through monitoring the ground motion by seismometer and portable anemometer, and then performed cyclic shear tests on the materials laying above the sliding surface. The test results suggest that the windthrow may have promoted the buildup of excess pore-water pressure within the saturated soil layer and thus favoured the occurrence of slope failure. Therefore, it is suggested that in the prediction of shallow landslides on forested slopes subjected to heavy storm, both the effects of rainfall and strong wind should be taken into account.
KeywordTephra slope Shallow landslides Fluidization process Heavy storm Wind load Vibration of ground
DOI10.1016/j.enggeo.2019.02.003
Indexed BySCI
WOS KeywordRAINFALL-INDUCED LANDSLIDES ; STABILITY ANALYSIS ; SATURATED SANDS ; OCTOBER 16 ; WIND ; TREES ; LIQUEFACTION ; FREQUENCIES ; EARTHQUAKE ; PREDICTION
Language英语
Funding ProjectJoint Usage/Collaborative Research Project of the Disaster Prevention Research Institute, Kyoto University[28A-04] ; MEXT KAKENHI[25900002]
WOS Research AreaEngineering ; Geology
WOS SubjectEngineering, Geological ; Geosciences, Multidisciplinary
WOS IDWOS:000464480600003
Funding OrganizationJoint Usage/Collaborative Research Project of the Disaster Prevention Research Institute, Kyoto University ; MEXT KAKENHI
PublisherELSEVIER SCIENCE BV
EI Accession NumberELSEVIER SCIENCE BV
Citation statistics
Document Type期刊论文
Identifierhttp://ir.imde.ac.cn/handle/131551/25893
Collection中国科学院水利部成都山地灾害与环境研究所
Corresponding AuthorWang, Gonghui
Affiliation1.Kyoto Univ, Disaster Prevent Res Inst, Res Ctr Landslides, Uji, Kyoto 6110011, Japan;
2.Chinese Acad Sci, Inst Mt Hazards & Environm, Chengdu 610041, Sichuan, Peoples R China;
3.Kyoto Univ, Grad Sch Sci, Uji, Kyoto 6110011, Japan;
4.Kyoto Univ, Grad Sch Sci, Uji, Kyoto, Japan
Recommended Citation
GB/T 7714
Wang, Gonghui,Jiang, Yao,Chang, Chengrui,et al. Volcaniclastic debris avalanche on Motomachi area of Izu-Oshima, Japan, triggered by severe storm: Phenomenon and mechanisms[J]. ENGINEERING GEOLOGY,2019,251:24-36.
APA Wang, Gonghui,Jiang, Yao,Chang, Chengrui,Doi, Issei,&Kamai, Toshitaka.(2019).Volcaniclastic debris avalanche on Motomachi area of Izu-Oshima, Japan, triggered by severe storm: Phenomenon and mechanisms.ENGINEERING GEOLOGY,251,24-36.
MLA Wang, Gonghui,et al."Volcaniclastic debris avalanche on Motomachi area of Izu-Oshima, Japan, triggered by severe storm: Phenomenon and mechanisms".ENGINEERING GEOLOGY 251(2019):24-36.
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