Panoramic Review and Comparative Analysis of Landslides Triggered by the 2008 Wenchuan Earthquake and the 2013 Lushan Earthquake
In order to support disaster prevention,mitigation,and relief efforts for earthquake-triggered landslides,it is es-sential to thoroughly understand the development and distribution characteristics of co-seismic landslides.Based on a literature review,and the visual interpretation of high-resolution satellite images and ultra-high-resolution UAV aerial ima-ges,combined with the field investigation validation,landslides triggered by the 2008 Wenchuan and 2013 Lushan earth-quakes were taken as examples,research findings on typical landslides,co-seismic landslide databases,and landslide distri-bution rules were introduced.The results show that the landslides triggered by the Wenchuan earthquake present features of large amounts,wide areas,large scales and severe impacts;that the landslides triggered by the Lushan earthquake are about 1/9 of the number,1/60 of the area,1/150 of the volume,and 1/20 of the distribution area compared to those triggered by the Wenchuan earthquake;that the ratio of the scalar seismic moment is roughly equal to the ratio of the co-seismic landslide development degree for both earthquakes,indicating that the differences in landslides triggered by the two earthquakes are primarily due to variations in the energy release;and that the spatial distribution of landslides triggered by both earthquakes presents an elliptical pattern,with the long axis aligning with the fault rupture direction.Additionally,the findings on topo-graphic changes in the seismic area caused by the crustal uplift and co-seismic landslides during the Wenchuan earthquake were summarized.