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Airphoto Interpretation and GIS Analyses of the Landslides by 2018 Hokkaido Iburi-Tobu Earthquake
( Yamagishi Hiromitsu ),( Junko Iwahashi ) 대한지질공학회 2019 대한지질공학회 학술발표회논문집 Vol.2019 No.2
An intensive earthquake (M6.7) happend in Hokkaido Iburi-Tobu area on September 6th, 2018. This earthquake triggered many landslides in 20km × 20km area and claiming 36 people lives. The author interpretd the ortho photographs by Geogrphical Institute Survey (GSI), Japan, and inventoried about 10,000 sites of the landslides and classified three types such as 1) Spoon type (S), 2) Planar type (P) and 3)Jisuberi type (J). The landslide area is composed of Neogene sedimnary rocks and covering Quaternary pumice and ash up to several meters thick. Therefore, the sliding landslide materials are mainly the pumice and ash, defined by P and S type. However, the southern area is characterized by deep-seated landslides defined as dip-slipping of Neogene bed rocks. And then, we were trying the GIS Analyses by ArcGIS 10.2 for the relationship between the landslide frequency and topographic and geologic factors. The topographic factors are derived from 10m _DEM downloaded from GSI and geologic ones from digital geologic map of Hokakido by Engineering Geologic Society of Hokkaido, Japan. As the results, we revealed that most of the landslides of S type and P type occurred at the slope gradients ranging from 25-35 degrees, and in places, the slope gradients steepend at maximum 5 degree, possibly by the erosion of the landsliding, and that debris of the Jissuberi type took place along the 10-20 degrees of stratum dipping of the Neogene Formations, as well as old Jisuberi.
BRIEF COMMUNICATION : Ampullary Adenoma Treated by Endoscopic Double-Snare Retracting Papillectomy
Hiromitsu Soma,Naoteru Miyata,Shigenari Hozawa,Hajime Higuchi,Yoshiyuki Yamagishi,Yuji Nakamura,Keita Saeki,Kaori Kameyama,Yohei Masugi,Naohisa Yahagi,Takanori Kanai 대한소화기학회 2015 Gut and Liver Vol.9 No.5
( Jie Dou ),( Hiromitsu Yamagishi ) 대한지질공학회 2019 대한지질공학회 학술발표회논문집 Vol.2019 No.2
On 5 September 2018 (UTC), the Mw=6.6 earthquake in Atsuma town, Hokkaido, Japan induced more than 10,000 landslides with high density, causing substantial economic losses and casualties, which provides a significant opportunity to advance understanding of the spatial distribution and controls for the landslide occurrence triggered by large earthquakes. A detailed, comprehensive inventory of landslides scarps was constructed using the high-resolution aerial photographs and 2 m Lidar DEM data. In total, 10133 landslide scarps were mapped, and the area of landslide scarp is 14.82 km2. The events are densely distributed in the study area. Statistical analysis of the landslide database was carried out. The correlations between coseismic landslide occurrence and geological factors and seismic factors were identified. The results indicate that ridge, geological factors, and seismic factor mainly control coseismic landslide occurrence. These findings are significant to deliberate in future seismic landslide hazard analysis.