Podcast
Questions and Answers
What is the key difference between a hazard and a natural disaster?
What is the key difference between a hazard and a natural disaster?
What makes lahars a volcanic hazard?
What makes lahars a volcanic hazard?
Why is depth important in determining the magnitude of an earthquake?
Why is depth important in determining the magnitude of an earthquake?
What geological feature is associated with the subduction zone?
What geological feature is associated with the subduction zone?
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What is the primary cause of the immense friction that occurs in subduction zones?
What is the primary cause of the immense friction that occurs in subduction zones?
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Flashcards
Hazard
Hazard
A naturally occurring event that poses risk to humans and property.
Natural Disaster
Natural Disaster
Occurs when a vulnerable population suffers loss of life or property due to a hazard.
Lahar
Lahar
A volcanic hazard formed from volcanic ash, rocks, and water mixing during rainfall.
Seismic Waves
Seismic Waves
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Subduction Zone
Subduction Zone
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Study Notes
Hazards and Natural Disasters
- A hazard is a naturally occurring event posing risk to humans and property.
- A natural event is a hazard only if it affects humans.
- Natural disasters occur when a vulnerable population experiences loss of life or property due to an event.
Lahars
- Lahars are a volcanic hazard.
- They form when volcanic eruptions deposit loose rocks and ash on the volcano's slopes.
- Rainwater mixes with this material, causing lahars to flow.
- Lahars cause property and human damage.
Magma and Earthquakes
- Water and gases are dissolved in magma.
- Earthquake magnitude is affected by distance from the focus.
- Seismic waves travel further, the longer it takes, the more their energy dissipates.
- Seismic waves are weaker and less intense at the epicenter.
Subduction Zones
- A subduction zone is where oceanic crust sinks beneath continental crust.
- Plate movement in subduction zones creates friction.
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Description
Explore the concepts of hazards, natural disasters, and the geological phenomena associated with them. This quiz covers topics like lahar formation, magma characteristics, and subduction zones. Test your understanding of how these natural events impact human populations and property.