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2021 Vol.17, Issue 4 Preview Page

Original Article

A Study on Risk Assessment Method for Earthquake-Induced Landslides

지진에 의한 산사태 위험도 평가방안에 관한 연구

서준표1ㆍ유송2ㆍ이기환3ㆍ이창우4ㆍ우충식5*

Junpyo Seo1, Song Eu2, Kihwan Lee3, Changwoo Lee4, Choongshik Woo5*

1Researcher official, Division of Forest Fire and Landslide, National Institute of Forest Science, Seoul, Republic of Korea
2Researcher official, Division of Forest Fire and Landslide, National Institute of Forest Science, Seoul, Republic of Korea
3Assistant Researcher, Division of Forest Fire and Landslide, National Institute of Forest Science, Seoul, Republic of Korea
4Senior Researcher official, Division of Forest Fire and Landslide, National Institute of Forest Science, Seoul, Republic of Korea
5Researcher official, Division of Forest Fire and Landslide, National Institute of Forest Science, Seoul, Republic of Korea
31 December 2021.
PDF Citation
Abstract
Purpose: In this study, earthquake-induced landslide risk assessment was conducted to provide basic data for efficient and preemptive damage prevention by selecting the erosion control work before the earthquake and the prediction and restoration priorities of the damaged area after the earthquake. Method: The study analyzed the previous studies abroad to examine the evaluation methodology and to derive the evaluation factors, and examine the utilization of the landslide hazard map currently used in Korea. In addition, the earthquake-induced landslide hazard map was also established on a pilot basis based on the fault zone and epicenter of Pohang using seismic attenuation. Result: The earthquake-induced landslide risk assessment study showed that China ranked 44%, Italy 16%, the U.S. 15%, Japan 10%, and Taiwan 8%. As for the evaluation method, the statistical model was the most common at 59%, and the physical model was found at 23%. The factors frequently used in the statistical model were altitude, distance from the fault, gradient, slope aspect, country rock, and topographic curvature. Since Korea's landslide hazard map reflects topography, geology, and forest floor conditions, it has been shown that it is reasonable to evaluate the risk of earthquake-induced landslides using it. As a result of evaluating the risk of landslides based on the fault zone and epicenter in the Pohang area, the risk grade was changed to reflect the impact of the earthquake. Conclusion: It is effective to use the landslide hazard map to evaluate the risk of earthquake- induced landslides at the regional scale. The risk map based on the fault zone is effective when used in the selection of a target site for preventive erosion control work to prevent damage from earthquake-induced landslides. In addition, the risk map based on the epicenter can be used for efficient follow-up management in order to prioritize damage prevention measures, such as to investigate the current status of landslide damage after an earthquake, or to restore the damaged area.
Keywords
Earthquake-Induced Landslide
Landslide Hazard Map
Risk Assessment
Disaster Prevention
Disaster Restoration
연구목적: 지진에 의한 산사태 위험도 평가를 통하여 지진발생 전에는 산사태 예방사업, 지진발생 후에는 피해지 예측 및 복구 우선순위 선정으로 지진유발 산사태 피해저감을 효율적·선제적으로 하기 위한 기초자료를 제공하고자 수행하였다. 연구방법: 국외 선행연구를 분석하여 평가 방법론 검토와 평가 인자를 도출하고 국내 산사태 위험지도 활용성을 검토하였다. 또한 지진동 감쇠식을 이용하여 포항지역의 단층대 및 진앙지 기준으로 지진에 의한 산사태 위험지도를 시범 구축하였다. 연구결과: 지진에 의한 산사태 위험도 평가 연구는 중국이 전체의 44%, 이탈리아 16%, 미국 15%, 일본 10%, 대만 8% 순으로 나타났다. 평가 방법론으로 통계적 모형이 59%로 가장 많았고, 물리적 모형이 23%로 나타났다. 통계적 모형에 많이 사용된 인자는 고도, 단층대와의 거리, 경사도, 사면방향, 모암, 지형곡률로 나타났다. 현재 국내의 산사태 위험지도는 지형·지질·임상이 반영되는데 이를 활용한 지진에 의한 산사태 위험도 평가는 합리적인 것으로 나타났다. 포항지역에 단층대 및 진앙지 기준으로 산사태 위험도를 평가한 결과 기존의 낮은 등급이 높은 등급으로 변화하는 등 지진의 영향이 고려되었다. 결론: 광역 단위의 지진유발 산사태 위험도 평가를 위해서는 산사태 위험지도를 활용하는 것이 효율적이다. 단층대 기준의 위험지도는 지진에 의한 산사태 피해방지를 위한 예방사방사업 대상지 선정에 활용하고, 진앙지 기준의 위험지도는 지진이 발생한 이후 산사태 피해 현황을 조사하거나 피해지 복구 등 피해방지 대책 우선순위 선정의 효율적 사후관리에 활용할 수 있다.
키워드
지진유발 산사태
산사태 위험지도
위험도 평가
재해예방
재해복구
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Information
  • Publisher :The Korean Society of Disaster Information
  • Publisher(Ko) :한국재난정보학회
  • Journal Title :Journal of the Society of Disaster Information
  • Journal Title(Ko) :한국재난정보학회논문집
  • Volume : 17
  • No :4
  • DOI :https://doi.org/10.15683/kosdi.2021.12.31.694
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