The Impacts Of Tectonic Hazards
Overview
If living near a volcano or fault line is so dangerous, why do hundreds of millions of people do it? The answer is that tectonic regions offer real rewards, from fertile soils to geothermal energy, and many people simply have nowhere else to go. When disaster strikes, though, the same event can kill a few people in one country and hundreds of thousands in another.
In this lesson you will weigh up the reasons people accept the risk, examine the social, economic and environmental impacts of earthquakes and eruptions, and master the scales geographers use to measure these events: the Richter and moment magnitude scales, the Mercalli scale and the volcanic explosivity index. You will see why magnitude alone never tells the whole story.
Objectives
- Reasons why people live in areas at risk from earthquakes and volcanic eruptions.
- The impacts of earthquakes.
- The impacts of volcanic eruptions.
- How the magnitude of a tectonic event is measured: moment magnitude scale, Richter scale, Mercalli scale, the volcanic explosivity index (VEI).
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Lesson Evaluation
Congratulations on completing the lesson on The Impacts Of Tectonic Hazards. Now that youve explored the key concepts and ideas, its time to put your knowledge to the test. This section offers a variety of practice questions designed to reinforce your understanding and help you gauge your grasp of the material.
You will encounter a mix of question types, including multiple-choice questions, short answer questions, and essay questions. Each question is thoughtfully crafted to assess different aspects of your knowledge and critical thinking skills.
Use this evaluation section as an opportunity to reinforce your understanding of the topic and to identify any areas where you may need additional study. Don't be discouraged by any challenges you encounter; instead, view them as opportunities for growth and improvement.
- Which scale measures the intensity of an earthquake from observed effects and eyewitness reports? A. Richter scale B. Mercalli scale C. moment magnitude scale D. volcanic explosivity index Answer: B
- On the Richter scale, a magnitude 6.0 earthquake shakes the ground how many times more than a magnitude 4.0? A. 2 times B. 10 times C. 100 times D. 1000 times Answer: C
- Which of the following is a reason people choose to live near volcanoes? A. frequent pyroclastic flows B. fertile volcanic soils C. toxic gases D. ash falls Answer: B
- The volcanic explosivity index (VEI) is based mainly on: A. the depth of the magma chamber B. the volume of material ejected and cloud height C. the number of aftershocks D. eyewitness reports Answer: B
- A fire caused by a gas main broken in an earthquake is best described as a: A. primary impact B. secondary impact C. tertiary impact D. environmental benefit Answer: B
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