Economic and Environmental Geology (자원환경지질)

The Korean Society of Economic and Environmental Geology (대한자원환경지질학회)
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Assessment of Earthquake Induced Landslide Susceptibility with Variation of Groundwater Level

지하수위 변화에 따른 지진 유발 산사태의 취약섬 분석

  • 김지석 (한국전력기술주식회사) ;
  • 박혁진 (세종대학교 지구정보공학과) ;
  • 이정현 (세종대학교 지구정보공학과)
  • Received : 2011.06.09
  • Accepted : 2011.08.09
  • Published : 2011.08.28
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Abstract

Since the frequency of the earthquake occurrence in Korean peninsular is continuously increasing, the possibility that massive landslides are triggered by earthquake is also growing in Korea. Previously, the landslide is known to be induced by large magnitude earthquake, whose magnitude is larger than 6.0. However, the landslide can be induced by only small magnitude earthquake, especially in the fully saturated soil. Therefore, the susceptibility of landslide caused by small magnitude earthquake in fully saturated soil is analyzed in this study. For that, the topographical and geological characteristics of the site were obtained and managed by GIS software. In the procedure of the study, slope angle, cohesion, friction angle, unit weight of soil were obtained and constructed as a spatial database layer. Combining these data sets in a dynamic model based on Newmark's displacement analysis, the landslide displacements were estimated in each grid cell. In order to check out the possibility of the earthquake induced landslides, the level of the groundwater table is varied from dry to 80% saturated soil. In addition, in order to analyze the effect of the magnitude of earthquake and distance to epicenter, four different earthquakes epicenters were considered in the study area.

최근 들어 우리나라에서도 지진의 발생빈도가 증가함에 따라 지진관련 재해에 대한 관심이 증가하고 있다. 특히 지진의 발생빈도가 증가함에 따라 지진에 의해 유발되는 산사태의 발생 가능성에 대한 연구의 필요성이 제기되고 있다. 최근 필리핀 레이테섬 산사태의 경우처럼 집중강우에 의해 포화된 사변에서는 소규모의 지진에 의해서도 대규모의 산사태가 유발될 수 있다는 사실이 밝혀짐에 따라 소규모 지진의 발생빈도가 증가하고 있는 우리나라에서도 지진에 의한 산사태의 발생 가능성이 제기되고 있다. 따라서 본 연구에서는 강우에 의해 지하수위가 상승하여 포화된 지반 조건에서 소규모 지진에 의해 유발될 수 있는 산사태의 가능성에 대한 분석을 수행하고자 하였다. 이를 위하여 국내의 지질 및 지형특성을 고려할 수 있는 Newmark displacement model을 해석모델로 선정하고 GIS 분석기법을 활용하여 연구대상지역에 대한 산사태 취약성 분석을 실시하였다. 연구 수행을 위하여 수치지형도와 지질도 등을 이용, 사변의 기하학적 특성과 지질공학적 특성에 대해 커버리지 형태인 10 m ${\times}$ 10 m 크기 격자(grid) 형태의 주제도를 작성하였으며 이를 지진특성에 의해 결정되는 Arias intensity와 임계가속도와 결합하여 Newmark 변위를 계산하였다. 본 연구에서는 특히 2007년 l윌 연구지역 주변에서 발생한 규모 4.8의 지진에 대하여 지진에 의해 유발되는 산사태의 취약성을 분석하였으며 지반의 포화정도가 취약성에 미치는 영향을 분석하기 위하여 지하수위를 변동시켜가며 분석을 수행하였다. 또한 지진의 규모와 진앙까지의 거리가 산사태의 취약성 해석결과에 미치는 영향을 파악하기 위하여 3.0 - 4.0 규모의 지진이 연구지역 내의 다양한 위치에서 발생하는 것을 가정하였으며 집중강우에 의해 지반에 포화된 상황을 고려하기 위해 지하수위를 변동시켜가며 산사태의 취약성을 분석하였다.

Keywords

Acknowledgement

Supported by : 한국연구재단

References

  1. Castaldini, D., Genevois, R., Panizza, M., Puccinelli, A. and Simoni, A. (1998) An integrated approach for analysing earthquake induced surface effects: A case study from Northern Apennines, Italy. Journal of Geodynamics, v.26, p.413-441. https://doi.org/10.1016/S0264-3707(97)00047-1
  2. Chae, B.G., Kim, W.Y., Na, J.H., Cho, Y.C., Kim, K.S. and Lee, C.O. (2004) A prediction model of landslides in the Tertiary sedimentary rocks and volcanic rocks area. The Journal of Engineering Geology, v.14, p.443-450.
  3. Choi, J.W., Lee, S., Min, K.D. and Woo, I. (2004) Land-slide susceptibility mapping and verification using GIS and Bayesian probability model in Boun. Econ. Envon. Geol., v.37, p.207-223.
  4. Duncan, M. and Wright, S.G. (2005) Soil Strength and Slope Stability. John Wiley and Sons, 297p.
  5. Hadj-Gamou, T. and Kavazanjian, E. Jr. (1985) Seismic stability of gentle infinite slopes. ASCE J. Geotech Engrg., p.681-697.
  6. Harp, E.L. and Wilson, R.C. (1995) Shaking intensity thresholds for rock falls and slides: Evidence from 1987 whittier Narrows and Superstition hills earthquake strong motion records. Bull. Seis. Soc. Am., v.85, p.1739-1757.
  7. Havenith, H., Storm, A., Caceres, F. and Picard, E. (2006) Analysis of alndslide susceptibility in the Suusamyr region, Tien Shan. Landslides, v.3, p.39-53. https://doi.org/10.1007/s10346-005-0005-0
  8. Jibson, R.W. and Keefer, D.K. (1993) Analysis of the seismic origin of landslides Examples from the New Madrid seismic zone. Bull. Seis. Soc. Am., v.105, p.421-436.
  9. Jibson, R.W., Harp, E.L. and Michael, J.A. (1998) A method for producing digital probabilistic seismic landslide hazard map. US Geol. Surv. open file.
  10. Jibson, R.W., Harp, E.L. and Michael, J.A. (2000) A method for producing digital probabilistic seismic landslide hazard maps. Engineering Geology, v.58, p.271-289. https://doi.org/10.1016/S0013-7952(00)00039-9
  11. Julian, M. and Anthony, E. (1996) Aspect of landslide activity in the Mecantour Massif and the French Rivera, southeastern France. Geomorphology, v.15, p.275-289. https://doi.org/10.1016/0169-555X(95)00075-G
  12. Keefer, D.K. (1984) Landslides caused by earthquakes. Geol. Soc. Am. Bull.. v.95, p.406-421. https://doi.org/10.1130/0016-7606(1984)95<406:LCBE>2.0.CO;2
  13. Keefer, D.K. (2000) Statistical analysis f an earthquake-induced landslide distribution-1989 Loma Prieta, California event. Engineering Geology, v.58, p.231-249. https://doi.org/10.1016/S0013-7952(00)00037-5
  14. Khanzai, B. and Sitar, N. (2000) Assessment of seismic slope stability using GIS modeling. Geogr. Inf. Sci., v.6, p.121-128.
  15. Kim, K.S., Kim, W.Y., Chae, B.G. and Cho, Y.C. (2000) Engineering geologic characteristics of landslide induced by rainfall. The Journal of Engineering Geology, v.10, p.163-174.
  16. Kim, W.Y. and Chae, B.G. (2009) Characteristics of rainfall, geology and failure geometry of the landslide areas on natural terrains, Korea. The Journal of Engineering Geology, v.19, p.331-344.
  17. Korea Highway Corporation (2009) Road Design Guideline, 472p.
  18. Lee, M.J., Lee, S. and Won, J.S. (2004) Study on landslide using GIS and remote sensing at the Kangneung area (I). Econ. Envon. Geol., v.37, p.425-436.
  19. Lee, S. and Min, K.D. (2000) Landslide analysis of Yongin area using spatial database. Econ. Envon. Geol., v.33, p.321-332.
  20. Lee, S., Lee, M.J. and Won, J.S. (2005) Landslide susceptibility and verification using artificial neural network in the Kangneung area. Econ. Envon. Geol., v.38, p.33-43.
  21. Lin, M. and Tung, C. (2003) A GIS based potential analysis f the landslides induced by the Chi-Chi earthquake. Engineering Geology, v.71, p.63-77.
  22. Malamud, B.D., Turcotte, D.L. Guzzetti, F. and Reichenbach, P. (2004) Landslide inventories and their statistical properties. Earth Surf. Processes Landform, v.29, p.687-711. https://doi.org/10.1002/esp.1064
  23. Miles, S.B. and Ho, C.L. (1999) Rigorous landslide hazard zonation using Newmark's method and stochastic ground motion simulation. Soil Dyn. Earth Eng., v.18, p.305-323. https://doi.org/10.1016/S0267-7261(98)00048-7
  24. Murphy, W. (1995) Earthquake triggered landslide at the Brunssummerheide, Limburg. the Netherlands. Quaterly Journal of Engineering Geology, v.28, p.61-74. https://doi.org/10.1144/GSL.QJEGH.1995.028.P1.06
  25. Newmark, N.M. (1965) Effects of earthquakes on dams and embankents. Geotechnique, p.139-160.
  26. Oh, H.J. (2010) Landslide detection and landslide susceptibility mapping using aerial photos and artificial neural networks, Korean J. of Remote Sensing, v.26, p.47-57. https://doi.org/10.7780/kjrs.2010.26.1.47
  27. Park, N.W., Chi, K.H., Chung, C.J., and Kwon, B.D. (2005) Application of GIS based probabilistic empirical and parametric models for landslide susceptibility analysis. Econ. Envon. Geol., v.38, p.45-55.
  28. Park, H.J., Lee, S. and Kim, J.W. (2003) Analysis and verification of slope disaster hazard using infinite slope model and GIS. Econ. Environ. Geol., v.36, p.313-320.
  29. Parise, M. and Jibson, R.W. (2000) A seismic landslide susceptibility rating of geologic units based on analysis of characteristic of landslides triggered by the 17 Jan. 1994 Northridge, California earthquake. Engineering Geology, v.58, p.251-270. https://doi.org/10.1016/S0013-7952(00)00038-7
  30. Refice, A. and Capolongo, D. (2002) Probabilistic modeling of uncertatinties in earthquake-induced landslide hazard assessment. Computers and Geosciences, v.28, p.735-740. https://doi.org/10.1016/S0098-3004(01)00104-2
  31. Rodriguez, C.E., Bommer, J.J. and Chandler, R.J. (1999) Earthquake induced landslide:1980-1997. Soil Dynamics and Earthquake engineering, v.18, p.325-346. https://doi.org/10.1016/S0267-7261(99)00012-3
  32. Ryu, J.H., Lee, S., and Won, J.S. (2002) Weight determination of landslide factors using artificial neural networks. Econ. Envon. Geol., v.35, p.67-74.
  33. Seed, H.B. (1967) Slope stability during earthquakes. ASCE, J. Soil Mech. Found. Div., p.299-323.
  34. Song, Y.S. and Hong, W.P. (2007) A case study on the analysis of cause and characteristics of a landslide at the sedimentary rock area, The Journal of Engineering Geology, v.17, p.101-113.
  35. Tibaldi, A., Ferrari, L. and Pasquare, G. (1995) Landslide triggered by earthquakes and their relations with faults and mountain slope geometry: an example from Ecudor. Geomorphology, v.11. p.215-226. https://doi.org/10.1016/0169-555X(94)00060-5
  36. Van Westen. (1993) Geographic Information systems in slope Instability Zonation, ITC, Publication, 15, p.245.
  37. Wang, H. (2008) Probabilistic modeling of seismically triggered landslides using Monte Carlo simulations. Landslide, 5, p.389-391.
  38. Wieczorek, G.F., Wilson, R.C. and Harp, E.L. (1985) Map showing slope stability during earthquakes of San Mateo county, California. US Geol. Surv. Misc. Geol. Investig. map I-1257e, scale 1:62500.
  39. Wilson, R.C. and Keefer, D.K. (1983) Dynamic analysis of a slope failure from the 6 August 1979 Coyote lake, California earthquake. Bull. Seis. Soc. Am., v.73, n.3, p.863-877.
  40. Wilson, R. C. and Keefer, D. K. (1985) Predicting areal limits of earthquake induced landsliding. In: Ziony, J. I. (Ed.), Evaluating Earthquake Hazards in the Los Angeles Region. An Earth-science Perspective. US Geol. Surv. Prof., Paper 1360, p.316-345.