The movement of landslide The movement of landslide material can vary from abrupt collapses to slow gradual slides and at rates which range from almost undetectable to extremely rapid. Sudden and rapid events----->the most dangerous Extremely slow landslides might move only millimetres or centimetres a year and can be active over many years.---->not a threat to people but to property. The movement of landslide  The movement of landslide material can vary from abrupt collapses to slow gradual slides and at rates which range from almost undetectable to extremely rapid.  Sudden and rapid events-----→ the most dangerous  Extremely slow landslides might move only millimetres or centimetres a year and can be active over many years. ----→ not a threat to people but to property