GROUP 2

• Candra Dini ()• Nugroho Purwoko ()• Ananto Wijanarko ()• Ilham Romadhona (02858)

LANDSLIDE

LANDSLIDES

NATURAL PHENOMENA THAT OCCUR WITH OR

WITHOUT HUMAN ACTIVITY

In general definition

A landslide is a geological phenomenon which includes a wide

range of ground movement, such as rock falls, deep failure of slopes and shallow

debris flows, which can occur in offshore, coastal and onshore environments.

The factors which influence whether

Slope angle Climate Weathering Water content Vegetation Overloading Geology, and slope stability.

Natural causes include

Elevation of pore water pressure by saturation of slope material from either intense or prolonged rainfall and seepage

Vibrations caused by earthquakes Undercutting of cliffs and banks by waves

or river erosion Volcanic eruptions.

Human causes include: Removal of vegetation Interference with, or changes to, natural

drainage Leaking pipes such as water and sewer

reticulation Modification of slopes by construction of

roads, railways, buildings, etc Overloading slopes Mining and quarrying activities Vibrations from heavy traffic, blasting, etc Excavation or displacement of rocks.

The characteristics of landslides

The emergence of new springs Happen after the rain on hill or cliff If the rainy season usually stagnant

water, but toward of the disaster, the water disappear.

Heard sound of rumble

The Process

1. The water seeped into the soil will add weight to the ground.

2. If water penetrates the soil impermeable to water which acts as a handful of fields, then the ground becomes slippery.

3. Furthermore, weathering of soil above it will move to follow the slope and exit slopes.

How to prevent landslides??

Stop illegal logging !!! Stop illegal mining !!! Make Drynase or terasland Don’t make a new farmland

Negative effects of landslide

Economic Decline Damage To Infrastructure Loss Of Life

Positive effect of landslide

Make fertile of land Accelerate the process of stone forge in

land

Thank You. . .