16 Questions
What is the first step to take during a landslide?
Keep yourself alert and awake.
What is a common cause of sinkhole formation?
Soil erosion
What should you do if you cannot escape a landslide?
Curl into a ball
What is a type of sinkhole that forms in areas where sand covers the bedrock?
Cover-subsidence sinkhole
What should you do after a landslide?
Go to a public shelter
What is a consequence of a cover-collapse sinkhole?
Catastrophic damage
Why are cenotes in Mexico important?
They expose underground rivers
What is a factor that can compromise the underlying foundation of an area?
Soil erosion
What is the main cause of rainfall-induced landslides?
Heavy rainfall due to storms and typhoons
What can be affected by landslides?
Water availability, quantity, and quality
What is a sign of an impending landslide?
New areas of moisture
What can be done to prepare your home for landslides?
Following proper land-use procedures
What is the negative economic effect of landslides?
Cost to repair structures, loss of property value, and disruption of transportation routes
What is the purpose of making an emergency plan?
To discuss safety protocol in the event of a landslide
What is a retention wall used for?
To deflect or retain soil or rocks
Why is it important to monitor changing water levels?
To detect early signs of a landslide
Study Notes
Geological Hazards
- Rainfall-induced landslides are caused by heavy rain due to storms and southwest monsoons (habagat)
- Landslides result in the sliding down of soil, rocks, or mud from an elevated place, causing damage to houses, structures, and properties, and can even lead to loss of lives
- Negative economic effects of landslides include:
- Cost to repair structures
- Loss of property value
- Disruption of transportation routes
- Medical costs in the event of injury
- Indirect costs such as lost timber and lost fish stocks
- Landslides can affect water availability, quantity, and quality
Warning Signs of Landslides
- Look for new areas of moisture
- Look for warping in your home
- Look for warping and movement in the surrounding area
- Notice unusual sounds
- Monitor changing water levels
Preparing for Landslides
- Follow proper land-use procedures
- Contact local officials about past landslides
- Consider building retaining or deflection walls
- Talk to an insurance agent if your area is at risk
- Make an emergency kit
Safety During a Landslide
- Keep yourself alert and awake
- Listen to a local news station for updates
- Evacuate if it is safe to do so
- Be cautious and alert while driving
- Move to a second story, if possible
- Move out of the path of the landslide as quickly as you can
- Avoid river valleys and other low areas
- Curl into a ball if you cannot escape
Safety After a Landslide
- Go to a public shelter
- Avoid the area where the landslide occurred
- Check for trapped and injured people
- Help neighbors who need special assistance
- Assess the area for damage and safety
- Replant the affected area
- Talk to a geotechnical expert
Sinkholes
- Form when water dissolves surface rocks
- Types of sinkholes:
- Dissolution or solution sinkhole
- Cover-subsidence sinkhole
- Cover-collapse sinkhole
Causes of Sinkholes
- Soil erosion
- Underground caverns
- Leaking pipes and sewers
- Factors can compromise the underlying foundation over time, leading to sinkholes forming rapidly or gradually across a variety of terrains
Test your knowledge on geological hazards such as landslides, sinkholes, and more. Analyze the causes and recognize signs of impending geological hazards.
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