How to Predict a Landslide

A landslide results from loose soils piling on top of hard earth like clay or bedrock. The loose soil lets water in but the layer underneath doesn't absorb it, and this instability can cause landslides. Predicting a landslide is possible in part because landslides typically occur where they have happened before.

Instructions

1. Know what factors contribute to a landslide. The geological makeup of an area is a good indicator. Gravity plays a role as well; the steeper the slope, the more likely it is to have a landslide. Weather such as heavy rains, quick freezing and thawing, earthquakes, fires, storms and volcanic eruptions can also be triggers. Additionally, erosion and changes in the landscape caused by humans can be predictors of landslides.

2. Check the water table levels. High accumulations of ground water can be dangerous in steep areas.

3. Look at any buildings in the area. Be aware that growing cracks in walls, window frames and pavement are a possible clue. Additionally, broken or leaking sewer lines, doors that don't quite close anymore, and sagging or very tight utility lines can also be warning signs that the ground is shifting and a landslide is inevitable.

4. Watch any tilted, curved or clustered trees carefully. If you spot exposed clay or blocked natural drainage, see an unusual spring flow or find ponds on sloping terrain, you may want to prepare for a landslide.

5. Listen. A faint rumbling sound can also let you know a landslide is coming.

Tips & Warnings

• Contact your local fire department if you believe a landslide is imminent.

Resources

• Useful advice for dealing with a landslide.