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- W4313017796 abstract "The devastating 2008 Wenchuan earthquake (Mw 7.9) was the largest seismic event in China in the past more than 50 years and is characterized by extremely high level of induced acceleration. For example, the strong ground motion recorded at the Wolong seismic station registered the EW, NS, and UD peak accelerations being 957.7, 652.9, and 948.1 Gal, respectively. Accordingly, this earthquake triggered nearly 200,000 coseismic landslides over an area of 110,000 km2, out of which more than 800 dammed rivers, posing severe threats to downstream settlements. The total area of the coseismic landslides was about 1160 km2 and the total volume was about 10 km3. These landslides are characterized by their great number, high density, large scale, widespread distribution, and clustering of occurrence. Analysis shows that they are positively correlated with the slope angle, the seismogenic fault distance and seismic intensity, and have dominant orientations, i.e., east, southeast, and south. Meanwhile, most landslides took place in the areas with sandstone, siltstone, and granitic rocks. Large-scale landslides (with an area of more than 50,000 m2) were concentrated in the areas, where fault slip rates were highest near the intersections and junctures of individual segments of the faults. The head scarps of the large coseismic landsides are serrated, rough, and steep due to the tensile stress, and differ from the smooth arc-shaped scarps of gravitational landslides caused by shear stress. Aftershock monitoring has been carried out to better understand the slope response to seismic shaking. After the earthquake, the regions of strong shaking experienced several heavy rainstorms that induced many catastrophic landslides and debris flows. In this paper, the distribution and evolution of landslides in the post-Wenchuan earthquake area are discussed. Case studies of representative post-seismic landslide areas are presented as well. Predicting the post-earthquake landslides and assessing their long-term effect and risk are still of great concern and remain a challenge, due in part to lack of empirical data with sufficient temporal resolution." @default.
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- W4313017796 date "2022-01-01" @default.
- W4313017796 modified "2023-10-18" @default.
- W4313017796 title "Report on Landslides Triggered by the 2008 Wenchuan Earthquake" @default.
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- W4313017796 doi "https://doi.org/10.1007/978-981-19-6597-5_1" @default.
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