Abstract:According to history and instruments, south Longmenshan fault, which is considered a seismogenic structure, has experienced three strong shocks: the 1327 Tianquan, the 1970 Dayi, and the 2013 Lushan earthquakes. These earthquakes triggered rockfall and landslides. We survey the typical landslide and the historical earthquake landslides along the Dachuan-Shuangshi fault across the earthquake area and find the distribution range and transport distances triggered by historical earthquakes greater than the Lushan earthquake. The density, volume and particle size triggered by the historical earthquake reduces from southwest to northeast along the fault. Results from the rock fall of the historical earthquakes and the Lushan earthquake, based on relative chronological tests of buried object and epigenetic lichen, and the formula of sensible radius and epicenter, show that the ground vibration is more heavily triggered by the Tianquan earthquake in 1327. Vibrations from the 1327 earthquake may have triggered the Tianquan county “Dayanbeng” and Shuangshi town “Shaijingshu”. The historical earthquake epicenter may be located in the southwest section of the Dachuan-Shuangshi fault, near Tianquan county Xiangshuixi town. The intensity from the epicenter is greater than 9, and the magnitude of the paleo-earthquake may be great than or equal to the Lushan earthquake.
WANG Shiyuan,XU Chong,LIU Shao et al. Landslides Triggered by Earthquake in South Longmenshan Fault and Tianquan Earthquake in 1327[J]. jgg, 2018, 38(6): 609-613.