Evaluation model of landslide hazards induced by the 2008 Wenchuan earthquake using strong motion data
Xiuying Wang1, Gaozhong Nie2, Mujun Ma3
1 Institute of Crustal Dynamics, China Earthquake Administration, Beijing 100085, China 2 Institute of Geology, China Earthquake Administration, Beijing 100029, China 3 National Earthquake Response Support Service, Beijing 100049, China
Evaluation model of landslide hazards induced by the 2008 Wenchuan earthquake using strong motion data
Xiuying Wang1, Gaozhong Nie2, Mujun Ma3
1 Institute of Crustal Dynamics, China Earthquake Administration, Beijing 100085, China 2 Institute of Geology, China Earthquake Administration, Beijing 100029, China 3 National Earthquake Response Support Service, Beijing 100049, China
摘要Landslides induced by the 2008 Wenchuan earthquake in the Longmenshan area were relatively well instrumented, which makes it possible to investigate the landslides using ground motion records. Firstly, this paper analyzes the data from Wenchuan earthquake on both regional and local site scale. The analyses show that the Newmark accumulative displacement calculated from the ground motion recorded in a particular geological hazard zone corresponds to the hazard intensity in that zone; the larger the displacement, the more serious the geologic hazard. The calculated result also shows that the displacement is related to the Arias intensity, which represents the total energy released during the earthquake at the observation site. Secondly, this paper constructs an evaluation model of Newmark displacement calculated with Arias intensities to estimate the subsequent slope failure resulting from the earthquake. The calculated results based on the model _t well with the distribution of actual landslides, suggesting that this method is useful for hazard evaluation. Therefore, this type of model can be used for estimating regional-scale distribution of earthquake-induced landslides and their associated hazards immediately after an earthquake.
Abstract:Landslides induced by the 2008 Wenchuan earthquake in the Longmenshan area were relatively well instrumented, which makes it possible to investigate the landslides using ground motion records. Firstly, this paper analyzes the data from Wenchuan earthquake on both regional and local site scale. The analyses show that the Newmark accumulative displacement calculated from the ground motion recorded in a particular geological hazard zone corresponds to the hazard intensity in that zone; the larger the displacement, the more serious the geologic hazard. The calculated result also shows that the displacement is related to the Arias intensity, which represents the total energy released during the earthquake at the observation site. Secondly, this paper constructs an evaluation model of Newmark displacement calculated with Arias intensities to estimate the subsequent slope failure resulting from the earthquake. The calculated results based on the model _t well with the distribution of actual landslides, suggesting that this method is useful for hazard evaluation. Therefore, this type of model can be used for estimating regional-scale distribution of earthquake-induced landslides and their associated hazards immediately after an earthquake.
基金资助:Institute of Crustal Dynamics, China Earthquake Administration (No. ZDJ2010-28) and the National Natural Science Foundation of China (No. 40872209)
通讯作者:
Xiuying Wang
E-mail: xiuyw@sohu.com
引用本文:
Xiuying Wang, Gaozhong Nie, Mujun Ma. Evaluation model of landslide hazards induced by the 2008 Wenchuan earthquake using strong motion data[J]. 《地震学报》英文版, 2011, 24(3): 311-319.
Xiuying Wang, Gaozhong Nie, Mujun Ma. Evaluation model of landslide hazards induced by the 2008 Wenchuan earthquake using strong motion data. Earthquake Science, 2011, 24(3): 311-319.