Summary
Earthquakes and volcanic eruptions have significant impacts, both immediate and delayed, affecting people and environments globally. Understanding these impacts and why people live in danger zones is crucial for geography students.
- Primary Impacts — immediate effects of tectonic events Example: Ground shaking during an earthquake
- Secondary Impacts — delayed effects occurring after the initial event Example: Fires and tsunamis following an earthquake
- Geothermal Energy — renewable energy from Earth's heat Example: Iceland uses geothermal energy for electricity
- Fertile Farming Land — nutrient-rich soil from volcanic ash Example: Java, Indonesia, benefits from fertile volcanic soil
- Magnitude — total energy released by an earthquake Example: Measured using the Richter or MMS scales
- Intensity — damage and shaking experienced at a location Example: Measured using the Modified Mercalli Intensity Scale
Exam Tips
Key Definitions to Remember
- Primary Impact
- Secondary Impact
- Magnitude
- Intensity
Common Confusions
- Magnitude vs. Intensity
- Focus vs. Epicenter
Typical Exam Questions
- Why do people live near volcanoes? Economic benefits like fertile soil and geothermal energy
- What are primary and secondary impacts of earthquakes? Primary: Ground shaking; Secondary: Fires, tsunamis
- How do magnitude and intensity differ? Magnitude: Energy released; Intensity: Damage observed
What Examiners Usually Test
- Understanding of primary and secondary impacts
- Differences between magnitude and intensity
- Reasons for living in tectonic hazard zones