Consideration on the influence of seismic shaking on forest slope stability and landslide warning rainfall in the aftermath of the strong earthquake

Tetsuya Kubota, Go Nakamura, Yoshinori Shinohara, Aril Aditian

Research output: Contribution to journalArticle

Abstract

The research concerning about the warning rainfall criteria of landslides after strong earthquakes is conducted associated with the great earthquake in Eastern Japan in 2011 (M=9.0). After this kind of strong earthquake, soil strength of the slopes in the region that were exposed to the strong seismic forces is generally reduced by seismic shaking (vibration). In this situation, the revised rainfall criteria for landslides are required. On this point of view, the response of landslide to rainfall under this weaken soil condition was studied. Hence, the impact of rainfall events on the specific landslide slopes that experienced the strong seismic shaking is analyzed using numerical simulation method i.e. finite element method FEM in order to evaluate the critical rainfall threshold for landslide occurrence. Consequently, we obtained following results. In the result of FEM analysis, the cracks induced by the earthquake Eire effective to increase the seepage and render the slopes instable. The slope deterioration mentioned above due to the impact of earthquake causes temporarily 40-50% reduction of critical rainfall for landslide occurrence, corresponding to decrease in safety factor "Fs" of the slopes from Fs= 1.02-1.04 to Fs=0.83-0.95. This reduction rate of critical rainfall is as same level as in the earlier researches based on field observations.

Original languageEnglish
Pages (from-to)163-167
Number of pages5
JournalJournal of the Faculty of Agriculture, Kyushu University
Volume59
Issue number1
Publication statusPublished - Feb 1 2014

Fingerprint

Landslides
Earthquakes
landslides
earthquakes
rain
Soil
Irish Republic
Vibration
safety factor
Ireland
soil strength
Research
seepage
Forests
vibration
Japan
soil quality
Safety
deterioration

All Science Journal Classification (ASJC) codes

  • Biotechnology
  • Agronomy and Crop Science

Cite this

Consideration on the influence of seismic shaking on forest slope stability and landslide warning rainfall in the aftermath of the strong earthquake. / Kubota, Tetsuya; Nakamura, Go; Shinohara, Yoshinori; Aditian, Aril.

In: Journal of the Faculty of Agriculture, Kyushu University, Vol. 59, No. 1, 01.02.2014, p. 163-167.

Research output: Contribution to journalArticle

@article{03510ba9df8c4024ae97750c6d85c3c9,
title = "Consideration on the influence of seismic shaking on forest slope stability and landslide warning rainfall in the aftermath of the strong earthquake",
abstract = "The research concerning about the warning rainfall criteria of landslides after strong earthquakes is conducted associated with the great earthquake in Eastern Japan in 2011 (M=9.0). After this kind of strong earthquake, soil strength of the slopes in the region that were exposed to the strong seismic forces is generally reduced by seismic shaking (vibration). In this situation, the revised rainfall criteria for landslides are required. On this point of view, the response of landslide to rainfall under this weaken soil condition was studied. Hence, the impact of rainfall events on the specific landslide slopes that experienced the strong seismic shaking is analyzed using numerical simulation method i.e. finite element method FEM in order to evaluate the critical rainfall threshold for landslide occurrence. Consequently, we obtained following results. In the result of FEM analysis, the cracks induced by the earthquake Eire effective to increase the seepage and render the slopes instable. The slope deterioration mentioned above due to the impact of earthquake causes temporarily 40-50{\%} reduction of critical rainfall for landslide occurrence, corresponding to decrease in safety factor {"}Fs{"} of the slopes from Fs= 1.02-1.04 to Fs=0.83-0.95. This reduction rate of critical rainfall is as same level as in the earlier researches based on field observations.",
author = "Tetsuya Kubota and Go Nakamura and Yoshinori Shinohara and Aril Aditian",
year = "2014",
month = "2",
day = "1",
language = "English",
volume = "59",
pages = "163--167",
journal = "Journal of the Faculty of Agriculture, Kyushu University",
issn = "0023-6152",
publisher = "Faculty of Agriculture, Kyushu University",
number = "1",

}

TY - JOUR

T1 - Consideration on the influence of seismic shaking on forest slope stability and landslide warning rainfall in the aftermath of the strong earthquake

AU - Kubota, Tetsuya

AU - Nakamura, Go

AU - Shinohara, Yoshinori

AU - Aditian, Aril

PY - 2014/2/1

Y1 - 2014/2/1

N2 - The research concerning about the warning rainfall criteria of landslides after strong earthquakes is conducted associated with the great earthquake in Eastern Japan in 2011 (M=9.0). After this kind of strong earthquake, soil strength of the slopes in the region that were exposed to the strong seismic forces is generally reduced by seismic shaking (vibration). In this situation, the revised rainfall criteria for landslides are required. On this point of view, the response of landslide to rainfall under this weaken soil condition was studied. Hence, the impact of rainfall events on the specific landslide slopes that experienced the strong seismic shaking is analyzed using numerical simulation method i.e. finite element method FEM in order to evaluate the critical rainfall threshold for landslide occurrence. Consequently, we obtained following results. In the result of FEM analysis, the cracks induced by the earthquake Eire effective to increase the seepage and render the slopes instable. The slope deterioration mentioned above due to the impact of earthquake causes temporarily 40-50% reduction of critical rainfall for landslide occurrence, corresponding to decrease in safety factor "Fs" of the slopes from Fs= 1.02-1.04 to Fs=0.83-0.95. This reduction rate of critical rainfall is as same level as in the earlier researches based on field observations.

AB - The research concerning about the warning rainfall criteria of landslides after strong earthquakes is conducted associated with the great earthquake in Eastern Japan in 2011 (M=9.0). After this kind of strong earthquake, soil strength of the slopes in the region that were exposed to the strong seismic forces is generally reduced by seismic shaking (vibration). In this situation, the revised rainfall criteria for landslides are required. On this point of view, the response of landslide to rainfall under this weaken soil condition was studied. Hence, the impact of rainfall events on the specific landslide slopes that experienced the strong seismic shaking is analyzed using numerical simulation method i.e. finite element method FEM in order to evaluate the critical rainfall threshold for landslide occurrence. Consequently, we obtained following results. In the result of FEM analysis, the cracks induced by the earthquake Eire effective to increase the seepage and render the slopes instable. The slope deterioration mentioned above due to the impact of earthquake causes temporarily 40-50% reduction of critical rainfall for landslide occurrence, corresponding to decrease in safety factor "Fs" of the slopes from Fs= 1.02-1.04 to Fs=0.83-0.95. This reduction rate of critical rainfall is as same level as in the earlier researches based on field observations.

UR - http://www.scopus.com/inward/record.url?scp=84897851757&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84897851757&partnerID=8YFLogxK

M3 - Article

AN - SCOPUS:84897851757

VL - 59

SP - 163

EP - 167

JO - Journal of the Faculty of Agriculture, Kyushu University

JF - Journal of the Faculty of Agriculture, Kyushu University

SN - 0023-6152

IS - 1

ER -