An evaluation of influential factors on landslide mobility during the 2008 Wenchuan earthquake
D. P. Guo1,2,3, M. Hamada2, and C. He11Key Laboratory of Transportation Tunnel Engineering, Ministry of Education, School of Civil Engineering, Southwest Jiaotong University, Chengdu 610031, China 2Department of Civil and Environmental Engineering, Waseda University, 3-4-1Okubo, Shinjuku-ku, Tokyo 169-8555, Japan 3Sichuan Railway Investment Group Co.Ltd, Chengdu, 610041, China
Received: 15 Jun 2013 – Accepted for review: 06 Jan 2014 – Discussion started: 21 Jan 2014
Abstract. The 2008 Wenchuan earthquake triggered a huge amount of landslides along the Longmenshan thrust belt zone in southwest China. It is essential to evaluate the effects of numerous influential factors on landslide mobility, as a result of having seriously endangered the lives and properties along travel path. Hence, the relations between equivalent coefficient of friction (μ = Hmax / Hmax) and other six parameters of 46 landslides, such as three topographical factors, landslide volume, horizontal peak ground acceleration (PHA) and rock type, have been qualitatively analyzed by means of simplified plots and regressions. The quantitative effectiveness of each factor on landslide mobility was revealed by multivariable analysis and it was found that slope height, rock type, slope transition angle and landslide volume were more influential than slope angle and seismic acceleration. The statistical significance tests and predictive results both demonstrated that the empirical-statistical model of landslide mobility yielded a satisfactory agreement between observations and predictions, therefore, the presented model could be practically applicable in similar geological conditions as Wenchuan earthquake affected area.
Guo, D. P., Hamada, M., and He, C.: An evaluation of influential factors on landslide mobility during the 2008 Wenchuan earthquake, Nat. Hazards Earth Syst. Sci. Discuss., 2, 613-647, doi:10.5194/nhessd-2-613-2014, 2014.