“…In steep terrain, coseismic landslides deliver enormous quantities of debris to channels (Dadson et al, 2004;Jibson & Keefer, 1993;Keefer, 1984;Marc et al, 2016;Roback et al, 2018;Xu et al, 2012). In months and years following, heavy rainfall may mobilize this debris (Iverson et al, 1997;, while new landslides form on weakened hillslopes (Fan et al, 2018;Marc et al, 2015Marc et al, , 2019 and can generate additional flows. With communications, transportation, and supply chains already disrupted and structures weakened, post-seismic debris flows may be particularly deadly and destructive (Zhang et al, 2013).…”