We are releasing the supplementary data for our accepted manuscript to Landslides. Figure 5: Data of Fig. 5. Distribution of particle stress state at 10 s. Np and Npt are the particle number at each interval of γ and the total particle number, respectively. The interval of γ is 1.8°. a case I; b case II; c case III; d case IV. Red and blue denote distributions of elastic and plastic particles, respectively. Purple shows the overlapped part of the distributions of elastic and plastic particles Figure 6: Data of Fig. 6. Cumulative probability of density ratio in a case I, b case II, c case III, and d case IV Figure 9a: Data of Fig. 9a. Front velocity evolution along the flow path denoted by the gray curve, on which the black dot shows the observed stopping point of the avalanche Figure 10a: Data of Fig. 10a. Density profile at the tip of the avalanche deposit, z is along the direction of negative gravity, and z = 0 corresponds to the bottom of the measured point