Evaluation of landslide susceptibility by slope stability analysis using an estimated distribution of tephra deposits－A case study in the northeastern part of Aso caldera－

Slip layer estimation of shallow landslides on Aso volcanic mountains in Japan based on tephra layer-physical properties of soil

“…Shallow landslides occur frequently on the Aso volcanic mountains. The same sediment disasters have repeatedly occurred in June 1953, July 1990, with the last one occurring on July 12 th , 2012 (Goto and Kimura, 2019;Higaki et al, 2019;Kimura et al, 2019; when a cumulative rainfall of 508 mm triggered numerous landslides throughout the month. The soil materials in the shallow landslides on the Aso volcanic mountains consist of tephra layers formed by volcanic activities.…”

Effects of Land Cover Changes and Rainfall Variation on the Landslide Size–Frequency Distribution in a Mountainous Region of Western Japan

“…The Omishima Observatory (Figure 1B) recorded total rainfall of 446.5 mm, with the 24-h rainfall reaching 249.5 mm, breaking previous records (Figure 2). This precipitation event triggered numerous landslides (Figure 1D), causing severe damage to property, infrastructure, and citrus orchards [29,34,35]. Based on post-storm aerial photos and satellite image interpretation, Kimura et al [30] identified 512 new landslides on Omishima Island; most of these occurred in forests and orchards, reflecting the proportions of land use and land cover on the island by area.…”

“…This study investigated the size-frequency distribution of landslides on Omishima Island, western Japan. The island has been widely used as sloped farmland (mainly citrus orchards) [28] but has experienced rapid land use and land cover changes in recent decades [29,30]. Performing statistical analyses using the three-parameter inverse gamma distribution [9], which has been broadly used to characterise landslides and their triggers, this study tested whether the difference in land cover changes preceding a recent storm event and the spatial variation in rainfall influence the size-frequency distribution of landslides.…”

Sliding layer estimation of shallow landslides on Aso volcanic mountains in Japan based on tephra layer-physical properties of soil

“…Shallow landslides occur frequently on the Aso volcanic mountains. Sediment disasters caused by the landslides repeatedly occurred in June 1953, July 1990, with the last one occurring on July 12th, 2012 (Goto and Kimura 2019;Higaki et al 2019;Kimura et al 2019;) when a cumulative rainfall of 508 mm triggered numerous landslides throughout the month. The soil materials in the shallow landslides on the Aso volcanic mountains consist of tephra layers formed by volcanic activities.…”