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The huge Donghekou landslide was triggered by the Wenchuan earthquake in 2008with about 2.4 × 10<sup>7</sup> m<sup>3</sup> of rock displaced. The landslideis considered as an example of an earthquake-induced "ejection" event, wheredislocated slope materials was expelled over a section of the slope, but the kinematicprocesses are not well understood. We used the 2-D granular discrete elementmethod to characterize the kinematic behavior and mechanics of this"ejection landslide". The initial boundary conditions were applied alongthe ball–wall contacts by using derived velocities integrated from strongmotion data with a duration of 125 s, including the peak acceleration near theDonghekou area. The constraints were primarily determined from the finalgeometry of the landslide and geological structures to account for the actuallandslide characteristics. Simulated results showed that the large localseismic acceleration and a free face under the sliding body, caused by thedip difference between the upper slide face and the natural slope, originatedfrom the activation of the landslide. For the lower sliding body, itskinematic mechanism was changed during sliding. Initially it was a push-typelandslide, and then gradually changed to a retrogressive landslide. Theeroded bed on the slope during the landslide had the potential of slightly increasing therunout distance from 1435 to 1519 m, and was predicted in the numericalsimulation

Mechanism of the Donghekou landslide triggered by the 2008 Wenchuan earthquake revealed by discrete element modeling