Earthquake Induced Lanslide.ppt Earth Science

Earthquake Induced Lanslide.

1. EARTHQUAKE EARTHQUAKE
INDUCED LANDSLIDEINDUCED LANDSLIDE
By: Mr. Agustin A . Pandoma

2. Why Landslides Occur?
-A change in the stability of a slope can be
caused by a number of factors acting together or
alone. These factors includes;
1. Removal support
2. Ground water pressure
3. Volcanic eruptions
4. Intense rainfall
5. Snowmelt
6. Human interventions
7. Earthquakes

3. TYPES OF LANDSLIDES
1.1.TopplesTopples
2.2.Rock FallsRock Falls
3.3.SlidesSlides
4.4.Laterals SpreadsLaterals Spreads
5.5.FlowsFlows
6.6.Complex sidesComplex sides

4. Topples
-Occurs suddenly when a massive part of a very
steep slopes break loose and rotate forward.
Rock Falls
-It involves chunks of detached rock that fall freely
for some distance or bounce and roll down the
steep slope.

5. Slides
-It involves large blocks of bedrock that break free
and slide down along a planar or curved surface.
Lateral Spread
-Triggered by earthquakes and affect a gentle
slopes with less than 10 degrees inclination.
Slope materials loses cohesion through
liquefaction caused by the shaking during
earthquakes.

6. Flows
-Involves downslope motion of a fined grained
clay, silt and fine sand made mobile by water
saturation. These flows include mudflows and
earthflows and common during the rainy season.
Complex Side
-Combinations of 2 or more types of movements.