A large number of landslides were triggered by the 5.12 Wenchuan earthquake and the 4.20 Lushan earthquake. The statistical results of field surveys indicate that the overall distribution pattern of the scale of earthquake-induced rockmass collapse and landslide changes with the earthquake intensity. This statistics-based result needs to be confirmed by performing laboratory physical experiments. Based on the framework of self-organized criticality (SOC) theory

shaking table tests of sandpile model under seismic excitations was conducted. The results show that for peak ground acceleration (PGA) in the range of 0.075g-0.125g

the relation between the amount and cumulative frequency of sand follows a negative power law; for PGA between 0.15g and 0.25g

the relation obeys a lognormal distribution; for PGA between 0.35g and 0.45g

the relation turns to obey a normal distribution. Data from the cellular automata numerical simulation demonstrate that

as the earthquake intensity increases

the dynamic behaviors of sandpile model exhibit a strong power-law first

then a weak power-law

and finally a normal distribution. It is suggested here that the above-revealed distribution laws may also apply to other areas. The new recognition will provide a scientific basis for the prediction of landslides triggered by earthquake.