The tremors of earthquakes can provoke mass movements such as landslides, rockslides and avalanches, especially on steep, unstable slopes. The geological composition and topographical structure of the Alpine region contribute to the fact that slope instabilities and mass movements occur relatively frequently in Switzerland. However, due to advances in geophysical and seismological methods in recent years, it is now possible to investigate slope instability in detail. These methods analyse the natural vibration behaviour and the reaction of slopes to earthquakes and provide valuable information about their stability. Although potentially unstable slopes can thus be detected, mapped and monitored, knowledge about the influence of environmental conditions on the seismic behaviour of these slopes is still limited.