2.10 Seismic effect


Seismic waves passing through rock adds stress which could causes fracturing in the rock mass. As a result, friction is reduced in unconsolidated masses as they are tarred apart which may induce liquefaction. Landslide is one of the major hazards resulting due to earthquakes. Blasting and earthquakes events affect rock slopes in two distinct ways with different time scales. The first effect is in the form of immediate co-seismic detachment of rock from a slope face. The second effect occurs over a longer timeframe involving opening of fissures and rock fracturing that may result in rock dislodgements in the future. Such effects of seismicity on rock slopes strongly depend on local conditions of the rock mass. Geological and topographic set up of the area may also control the level of susceptibility of failure of rock slope under the influence of seismicity