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

Istiyanti, Mega Lia; Goto, Shigeru; Kimura, Takashi; Sato, Go; Hayashi, Shigenari; Wakai, Akihiko; Higaki, Daisuke

doi:10.1186/s40677-020-00163-x

Cited by 2 publications

(3 citation statements)

References 8 publications

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“…The soil hardness in the Ohtsuru landslide shows that the tuff breccia has the highest soil hardness value, and the weathered andesite has the lowest soil hardness value. Furthermore, the soil hardness in the Ono landslide also shows that tuff breccia has the highest soil hardness value, and the weathered tuff breccia has the lowest soil hardness value (Istiyanti and Goto 2020). The soil hardness value in the Yabakei landslide was measured 1 m from the surface on the highly weathered tuff breccia layer.…”

Section: Resultsmentioning

confidence: 94%

“…The soil layers in the Yabakei landslide also could not be exposed due to unfavourable conditions. Moreover, a depth of 1 m on the highly weathered tuff breccia was observed (Istiyanti and Goto 2020).…”

Section: Field Measurementsmentioning

confidence: 98%

“…The characteristics of tuff breccia and andesite at diverse landslide mechanisms in Oita Prefecture has not been studied in detail. Istiyanti et al (2020) studied the physical properties of tephra layers and reported that the kuroboku and scoria layers have different physical properties of soil.…”

Section: Introductionmentioning

confidence: 99%

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Characteristics of tuff breccia-andesite in diverse mechanisms of landslides in Oita Prefecture, Kyushu, Japan

Istiyanti

Goto

Ochiai³

2021

Geoenviron Disasters

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Heavy rainfall frequently occurred in Kyushu and triggers the landslides every year. This study observes the landslides which occurred in Oita Prefecture, Kyushu, Japan. The landslides in this study, consisting of the same soil materials, tuff breccia and andesite materials; however, the landslide mechanisms were different. Two landslides occurred caused by heavy rainfall in the different timing of the landslide occurrence, and another landslide occurred without the heavy rainfall or an earthquake occurs. Therefore, this study aims to analyse the physical and mechanical properties of tuff breccia and andesite materials with diverse landslide mechanisms. This study performed soil stratigraphic analysis and soil hardness measurements in the field, and performed physical properties, saturated permeability, mechanical properties, and XRD tests in the laboratory. This study found that characteristics of tuff breccia and andesite in diverse mechanisms of landslides were not very different, especially on the landslides caused by heavy rainfall. Furthermore, the landslide in the andesite and tuff breccia areas could be divided into three types based on the timing of the landslide occurrence, scale of the landslide, and landslide mechanisms.

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Section: Resultsmentioning

confidence: 94%

Section: Field Measurementsmentioning

confidence: 98%

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Characteristics of tuff breccia-andesite in diverse mechanisms of landslides in Oita Prefecture, Kyushu, Japan

Istiyanti

Goto

Ochiai³

2021

Geoenviron Disasters

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Characteristics of physical properties of the sliding and its surrounding layers in landslides caused by the 2018 Hokkaido Eastern Iburi Earthquake

Istiyanti¹,

Goto

2022

Geoenviron Disasters

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A 6.6-Mw earthquake struck the Iburi region of Hokkaido, Japan, in 2018, triggering massive landslides. Most of these landslides were shallow and occurred mostly in the Atsuma and Abira towns. Ta-c and Ta-d tephra layers have been found in the Towa landslide at Atsuma from the Tarumai volcano, while Ta-d, En-a, and Spfa-1 tephra layers have been found in the Mizuho landslide at Abira from the Tarumai and Eniwa volcanos, as well as the Shikotsu caldera. Field observations from previous studies revealed that the sliding layers were located in the Ta-d and En-a layers at the Towa and Mizuho landslides, respectively. Unlike previous research on earthquake-induced landslides, which were investigated using mechanical properties, this study investigates the characteristics of physical properties, saturated permeability properties, and content of clay minerals on sliding and surrounding tephra layers. Results from this study reveal that the physical properties of sliding layers from two landslides demonstrated the same characteristics: non-plastic soil with a low density of soil particles, void ratio, and dry density; these characteristics could influence earthquake-induced landslides. It also reveals a relationship between the plasticity chart and the age of tephra materials, including the relationship between the weathering process and density of soil particles and the dissimilarity in characteristics of saturated permeability properties in tephra materials.

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

Cited by 2 publications

References 8 publications

Characteristics of tuff breccia-andesite in diverse mechanisms of landslides in Oita Prefecture, Kyushu, Japan

Characteristics of tuff breccia-andesite in diverse mechanisms of landslides in Oita Prefecture, Kyushu, Japan

Characteristics of physical properties of the sliding and its surrounding layers in landslides caused by the 2018 Hokkaido Eastern Iburi Earthquake

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