“…For example, on June 5, 2009, a huge catastrophic rockslide with a rock mass barrier in the front took place at the crest of the Jiweishan Mountain in Wulong County, Chongqing, China, with a long runout distance of 1,500 m, and the landslide body about 7.0 × 10 6 m 3 was moved towards the valley; as a result, about 0.47 km 2 of the residential area was buried, an iron ore mine was destroyed and 74 people were killed (Xu et al 2010;Yin et al 2011). On August 27, 2014, a similar large-scale landslide with one locking segment at its front toe occurred in Fuquan County, Guizhou province, China, which killed 23 people and destroyed 77 houses (Lin et al 2018). On June 24, 2017, a catastrophic landslide with locking masses in the front was triggered above the Xinmo Village, Maoxian County, Sichuan Therefore, the landslide with locking segments possesses a huge threat to people's lives and properties, to reduce the risk of landslides with locking segments, it is essential to identify the location, geometry, and area of the locking segments before the landslide failure.…”