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Earthquake Hazards and Damage — Reading Comprehension

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MS-ESS3-2

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This middle school science reading passage examines the hazards and damage caused by earthquakes, aligned with NGSS MS-ESS3-2. Students will learn about ground shaking, landslides, surface rupture, tsunamis, fires, and how factors like magnitude, geology, and engineering influence the impact. Real-world examples such as San Francisco 1906, Alaska 1964, Haiti 2010, and Japan 2011 are included to illustrate the variety of earthquake effects. The passage encourages scientific thinking about how we know what we know, emphasizing mechanisms like liquefaction and aftershocks. Glossary terms, comprehension questions, writing prompts, and graphic organizers support learning and accessibility. This resource is suitable for audio integration and helps students build vocabulary and analytical skills while preparing for real-world challenges.

CONTENT PREVIEW

NMSZ Vergleich — Damage-range comparison between a moderate New Madrid zone earthquake (1895, magnitude 6.8), and a similar Los Angeles event (1994, magnitude 6.7). Yellow indicates where shaking was felt; red indicates at least minor damage to buildings and their contents.
Wikimedia Commons (Public domain).

Earthquakes are sudden movements of the Earth's surface that can cause widespread damage and danger. These natural events are important to study because they threaten lives, property, and infrastructure in many parts of the world. Understanding earthquake hazards helps scientists, engineers, and communities prepare and reduce risk. This passage explores the main hazards caused by earthquakes, explains why they occur, and examines their impacts using real-world examples.

Ground Shaking and Surface Rupture

The most immediate hazard from an earthquake is ground shaking. The intensity of shaking depends on the earthquake's magnitude (the amount of energy released), the distance from the earthquake's center, and the local geology. For example, areas with soft sediments can experience more intense shaking because the ground acts like a sponge, amplifying the waves. Sometimes this causes liquefaction, when the ground temporarily behaves like a liquid, causing buildings and roads to sink or tilt. Another hazard is surface rupture, where the ground splits open along a fault line, breaking roads, pipes, and structures above.

Landslides, Tsunamis, and Fires

Earthquake shaking can trigger landslides on unstable slopes, especially in mountains or areas with loose soil. These landslides can bury homes and block roads, making rescue and recovery difficult. Under the ocean, earthquakes can cause tsunamis: giant waves formed when the seafloor suddenly moves. Tsunamis travel rapidly across oceans, flooding coastlines and causing destruction far from the earthquake's origin. Fires are another major hazard, often started by ruptured gas lines or broken electrical wires during an earthquake. Fires can spread quickly if water lines are damaged and firefighters cannot respond.

Building Collapse, Infrastructure Damage, and Aftershocks

The type and age of construction play a major role in earthquake damage. Older or poorly engineered buildings are more likely to collapse, trapping people inside. Earthquakes also damage infrastructure like bridges, roads, and utilities (electricity, water, sewage). After the main shock, aftershocks—smaller earthquakes—can continue for days or weeks, causing more damage and danger. Historic examples show the range of earthquake impacts: the 1906 San Francisco earthquake caused fires that destroyed much of the city; the 1964 Alaska earthquake led to landslides and tsunamis; the 2010 Haiti earthquake had massive building collapses; and the 2011 Japan earthquake triggered a devastating tsunami.

Understanding how earthquakes cause multiple hazards helps communities improve safety through engineering, emergency planning, and education. By studying past events and local geology, scientists can identify high-risk areas and develop better ways to reduce earthquake damage. These efforts support the broader scientific principle that human actions and natural systems are interconnected.

Interesting Fact: The energy released by a magnitude 8 earthquake can be over 1,000 times greater than a magnitude 6 earthquake, showing how small differences in magnitude can cause huge changes in damage.

What is the primary hazard caused directly by an earthquake?

Ground shakingFloodingStrong windsVolcanic eruptions

How does local geology affect earthquake damage?

Soft sediments can amplify shaking and increase damageHard rocks always cause bigger tsunamisLocal geology does not matterOnly mountains are affected

What is liquefaction?

When the ground behaves like a liquid during strong shakingWhen water turns into iceWhen rocks melt underwaterWhen the air becomes very humid

Which type of hazard can bury homes and block roads after an earthquake?

TsunamisLandslidesFiresSurface rupture

In the passage, what does the word 'infrastructure' mean?

Systems like roads, bridges, and utilitiesThe shape of mountainsTypes of soilMethods of earthquake measurement

Why are aftershocks dangerous?

They can cause additional damage after the main earthquakeThey always cause tsunamisThey only affect oceansThey make earthquakes easier to predict

Which historical earthquake caused a major tsunami and nuclear disaster?

San Francisco 1906Japan 2011Alaska 1964Haiti 2010

If a city is built on soft, wet soil, what is one likely effect during an earthquake?

Liquefaction may occur, causing buildings to sink or tiltThe city will be protected from all damageOnly the mountains will shakeNo aftershocks will happen

True or False: Fires after earthquakes are often caused by broken gas or electrical lines.

TrueFalse

True or False: All earthquakes cause tsunamis.

TrueFalse