Geology and Landslides

What is the primary factor that affects the level of creep induced by rainfall?

Amount of rainfall and changes in soil moisture (correct)
Type of vegetation
Soil density
Slope angle

What happens to the dirt at the valleyhead slope?

It creeps down and accumulates (correct)
It becomes compacted and dense
It becomes loose and fragmented
It gets washed away

What type of landslide occurs when the slope becomes saturated with water?

Colluvial landslide
Slumping landslide
Creep landslide
Debris flow landslide (correct)

What is the consequence of removal of buttressing earth at the foot of a slope of unconsolidated material?

Slumping landslide (C) Signup and view all the answers

What can the frequent occurrence of landslides in a section indicate?

Weak and unstable geology (C) Signup and view all the answers

What is the result of a colluvial landslide in a debris flow valley?

A series of secondary hazards (A) Signup and view all the answers

What is a reactivated landslide?

An old landslide that has changed and caused a new collapse (B) Signup and view all the answers

What can tension cracks found above an existing landslide indicate?

A reactivation of the existing landslide (B) Signup and view all the answers

Why is it important to explore the response of colluvial landslide to rainfall?

To predict the potential consequences of the landslide (A) Signup and view all the answers

What can be a sign of a landslide that is not caused by human activities?

Trees bending up in a J-curve (C) Signup and view all the answers

Why are landslides that occur in the same place considered retrogressive or piecemeal?

Because they are multiple landslide events that occur in the same place (A) Signup and view all the answers

What can be inferred from inspecting an area of an old landslide?

The region's underlying geology is fragile and vulnerable to landslides (C) Signup and view all the answers

What is the primary cause of landslides on sloping terrain?

Gravity (B) Signup and view all the answers

Why do structures built on steep-slope mountains have a high vulnerability to landslide hazards?

Because of the steep slope and heavy rainfall (A) Signup and view all the answers

What happens to the soil base of buildings or structures during long or regular rain?

It becomes saturated, weakening the soil base (C) Signup and view all the answers

What is the role of plants and trees in preventing landslides?

They absorb water and hold the soil together (C) Signup and view all the answers

What is characterized by a very slow downslope movement of particles?

Soil Creep Landslide (B) Signup and view all the answers

What is the outcome of a heavy downpour of rain on buildings and communities?

A quick destruction of buildings and communities (A) Signup and view all the answers

What should you do if escape is not possible during a landslide?

Curl into a tight ball and protect your head (D) Signup and view all the answers

Why is it more dangerous if mudflow occurs during a landslide?

It increases in strength as it meets more water (C) Signup and view all the answers

What should you avoid during a landslide?

Low-lying areas and steep slopes (D) Signup and view all the answers

What should you do after a landslide?

Stay away from the slide area and listen for latest emergency information (D) Signup and view all the answers

What is a sinkhole also known as?

Cenote, swallet, swallow hole (B) Signup and view all the answers

What causes most sinkholes?

Karst-the chemical dissolution of carbonate rocks (C) Signup and view all the answers

What should government leadership do to set an example in mitigation implementation?

Require new facilities to be designed and built according to modern building codes (A) Signup and view all the answers

What is the focus of the mitigation training programs?

Contemporary challenges associated with mitigation implementation (D) Signup and view all the answers

Why is hazard-specific research important?

To improve mitigation practices (B) Signup and view all the answers

How can communities determine and validate their vulnerability to geohazards?

Through scientific tools and visible signs (D) Signup and view all the answers

What should be included in a family disaster plan?

A communication plan and emergency supplies (A) Signup and view all the answers

What should be included in an emergency supply kit for a car?

Flares, jumper cables, and a radio (B) Signup and view all the answers