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Seismic retrofitting is the modification of existing structures to make them more resistant to seismic activity, ground motion, or soil failure due to earthquakes.With better understanding of seismic demand on structures and with recent experiences with large earthquakes near urban centers, the need of seismic retrofitting is well acknowledged.
The application of vegetation to increase the slope stability against erosion and landslide is a form of bioengineering that is widely used in areas where the landslide depth is shallow. Vegetation increases the stability of the slope mechanically, by reinforcing the soils through plant roots, which stabilize the upper part of the soil.
The term ground failure is a general reference to landslides, liquefaction, lateral spreads, and any other consequence of shaking that affects the stability of the ground. This usually takes place as an after-effect of an earthquake , and is one of the major causes of destruction after an earthquake.
A landslide in southern Alaska on Sunday left one person dead and several others injured, and some residents have been ordered to evacuate as officials warn another slide could strike nearby.
T housands of villagers in Papua New Guinea (PNG) may be evacuated over fears that a second landslide could take place following Friday’s deadly disaster in the Enga province.
Sudden slumps usually occur after earthquakes or heavy continuing rains, and can stabilize within a few hours. Most slumps develop over comparatively longer periods, taking months or years to reach stability. An example of a slow-moving slump is the Swift Creek Landslide, a deep-seated rotational slump located on Sumas Mountain, Washington.
In the wake of Hurricane Helene, more than 2,000 landslides displaced families in western North Carolina. They are waiting to find out if rebuilding is even possible or safe.
This type of measure is used in cases of smaller landslides. The effectiveness of micropiles is linked to the insertion of micropiles over the entire landslide area. In the case of rotational landslides in soft clay, the piles contribute to increasing the resisting moment by friction on the upper part of the pile shaft found in the landslide.