Plate Boundaries and Earthquakes Quiz

What type of plate boundary is most likely to produce violent volcanic eruptions?

• Constructive

• Destructive

• Conservative

• Collision

Which of the following can cause human-induced earthquakes?

• Subduction zones

• Fracking

• Mid-ocean ridges

• Rift valleys

What is the main difference between oceanic and continental hotspots?

• Oceanic hotspots produce more explosive eruptions

• Continental hotspots create shield volcanoes

• Oceanic hotspots create gentler eruptions, while continental hotspots are explosive

• Continental hotspots only exist at plate boundaries

Explain how earthquakes occur at transform plate boundaries.

Answer explanation

• At transform (conservative) boundaries, tectonic plates slide past each other.

• Friction prevents smooth movement, causing stress to build up.

• When the stress exceeds the strength of the rock, energy is suddenly released in the form of seismic waves, causing an earthquake.

• Example: The San Andreas Fault in California.

Describe how subduction zones contribute to volcanic eruptions.

Answer explanation

• In subduction zones, an oceanic plate sinks beneath a continental plate due to differences in density.

• The subducting plate melts as it descends into the mantle.

• The molten material (magma) is less dense than surrounding rock, so it rises toward the surface.

• This leads to explosive volcanic eruptions (e.g., Mount St. Helens, Japan’s volcanoes).

Compare and contrast the effects of volcanic eruptions at Hawaii and Yellowstone.

Answer explanation

• Hawaii has frequent but gentle eruptions, while Yellowstone has rare but catastrophic eruptions.

• Yellowstone could impact the global climate due to large ash clouds.

Assess how governments can reduce the impacts of earthquakes and volcanic hazards.

Answer explanation

• Prediction and Monitoring:

  • Use seismometers to detect early warning signs.

  • Monitor gas emissions from volcanoes (e.g., sulfur dioxide).

  • Develop earthquake early warning systems (Japan’s system alerts residents before shaking begins).

• Building Design and Land-Use Planning:

  • Construct earthquake-resistant buildings with shock absorbers.

  • Avoid building near active fault lines or volcanoes.

  • Reinforce critical infrastructure (e.g., hospitals, bridges).

• Emergency Preparedness and Response:

  • Conduct evacuation drills and public education campaigns.

  • Stockpile emergency supplies in high-risk areas.

  • Establish rapid response teams to provide aid after disasters.

Conclusion:
Governments can reduce deaths and economic damage through a combination of technology, infrastructure, and preparedness measures. Japan and Iceland are examples of countries successfully managing these risks.