sentences:  However, they tend to be more widespread and sudden.The most abundant types of earthquake-induced landslides are rock falls and slides of rock fragments that form on steep slopes.However, almost every other type of landslide is possible, including highly disaggregated and fast-moving falls; more coherent and slower-moving slumps, block slides, and earth slides; and lateral spreads and flows that involve partly to completely liquefied material (Keefer, 1999).