Natural Hazards: Earthquakes and Tsunamis

Active learning works because earthquakes and tsunamis are abstract but have clear, measurable causes and effects. Students need to connect plate movement to ground shaking, then to wave formation, and finally to human impact. Mapping, building, and discussing let them see these connections in real data and concrete contexts rather than just listening to explanations.

• 6th Grade
• Science
• 3 activities
• 20 min–50 min

Learning Objectives

1. Explain the relationship between undersea earthquakes and tsunami generation, citing specific plate tectonic processes.
2. Analyze seismic wave data to identify earthquake characteristics (magnitude, depth, location) that increase tsunami risk.
3. Evaluate the impact of geological features (e.g., seafloor topography, coastal shape) and soil conditions on tsunami wave height and earthquake damage.
4. Predict areas most vulnerable to tsunamis by interpreting geological maps and historical data.
5. Compare and contrast the damage caused by earthquakes and tsunamis, considering their distinct mechanisms and impacts.

Case Study Analysis

⏱ 35 min·Small Groups

Data Analysis: Mapping Earthquake and Tsunami Risk

Provide students with world maps showing tectonic plate boundaries and historical earthquake epicenters. Students overlay tsunami runup data from NOAA's database for three to four major events (e.g., 2004 Indian Ocean, 2011 Japan, 1964 Alaska). Groups identify patterns in where tsunamis originate and which coastlines are most vulnerable based on geography.

Prepare & details

Explain how earthquakes generate tsunamis.

Facilitation Tip: During Mapping Earthquake and Tsunami Risk, have students color-code risk zones on a printed map and mark plate boundaries with highlighters to reinforce the link between geology and hazard.

Setup: Groups at tables with case materials

Materials: Case study packet (3-5 pages), Analysis framework worksheet, Presentation template

• Analyze
• Evaluate
• Create
• Decision-Making
• Self-Management

Simulation Game

⏱ 50 min·Small Groups

Simulation Game: Building for Seismic Resistance

Using spaghetti, marshmallows, and index cards, student teams build structures of a specified height, then test them on a simulated shake table (a tray of jello or a board on wheels that is pushed side to side). Teams record the mode of failure, modify their designs, and test again. Debrief connects design features to real seismic engineering principles like base isolation and moment frames.

Prepare & details

Analyze the factors that determine the severity of earthquake damage.

Facilitation Tip: During Building for Seismic Resistance, circulate with a decibel meter to show how structural changes affect shaking intensity, making the simulation’s results measurable and memorable.

Setup: Flexible space for group stations

Materials: Role cards with goals/resources, Game currency or tokens, Round tracker

• Apply
• Analyze
• Evaluate
• Create
• Social Awareness
• Decision-Making

Think-Pair-Share

⏱ 20 min·Pairs

Think-Pair-Share: Earthquake Damage Factors

Present three brief scenarios: a M6.5 earthquake in the Tokyo metropolitan area, a M7.8 in a rural Himalayan village, and a M8.2 offshore of a well-prepared Pacific coast city. Ask: Which would likely cause the most deaths and why? Pairs discuss, then share reasoning with the class, drawing out the role of building quality, population density, preparedness, and soil type.

Prepare & details

Predict the areas most vulnerable to tsunamis based on geological features.

Facilitation Tip: During Think-Pair-Share: Earthquake Damage Factors, provide a one-sentence scenario on each table to anchor the discussion and prevent abstract drifting.

Setup: Standard classroom seating; students turn to a neighbor

Materials: Discussion prompt (projected or printed), Optional: recording sheet for pairs

• Understand
• Apply
• Analyze
• Self-Awareness
• Relationship Skills

Teaching This Topic

Teach this topic through layered modeling: start with tectonic forces, then simulate their effects on land and water, and finally analyze human systems. Avoid relying only on videos or lectures, as students often confuse magnitude with impact. Use real-time or near-real-time data from USGS or NOAA to anchor discussions in current events, which increases relevance and retention.

What to Expect

By the end of these activities, students explain how tectonic forces create earthquakes and tsunamis, evaluate risk factors beyond magnitude, and recommend practical preparedness actions. They use evidence from maps, simulations, and discussions to support their reasoning and adjust their initial misconceptions.

Watch Out for These Misconceptions

Common Misconception

During Think-Pair-Share: Earthquake Damage Factors, watch for students who assume all strong earthquakes kill many people.

What to Teach Instead

Use the Haiti vs. California example from the activity prompt to guide students to compare building codes, population density, and soil types, then revise their initial claims in writing.

Common Misconception

During Simulation: Building for Seismic Resistance, watch for students who believe swimming or boats can escape a tsunami.

What to Teach Instead

Pause the simulation after the first wave and ask students to calculate how long it would take to swim 100 meters versus how fast a tsunami travels, using the speed information provided in the activity materials.

Common Misconception

During Data Analysis: Mapping Earthquake and Tsunami Risk, watch for students who think earthquakes only happen at known plate boundaries.

What to Teach Instead

Ask students to add intraplate zones like New Madrid and Charleston to their maps and explain in a margin note why these areas are at risk despite not being on plate edges.

Assessment Ideas

Exit Ticket

After Data Analysis: Mapping Earthquake and Tsunami Risk, provide a scenario with a coastal city map marked with loose soil and a subduction zone. Ask students to draw two arrows showing where an earthquake could generate a tsunami and label one factor that increases local impact.

Quick Check

During Simulation: Building for Seismic Resistance, display a side-by-side photo of two building types after shaking. Ask students to write one sentence explaining which design performed better and why, then share responses in pairs before whole-class discussion.

Discussion Prompt

After Think-Pair-Share: Earthquake Damage Factors, facilitate a class discussion using the prompt 'What are the top three factors a coastal town must consider when planning for earthquakes and tsunamis, and how would you prioritize them?' Collect responses on the board and vote as a class to reach consensus.

Extensions & Scaffolding

• Challenge students who finish early to design a community warning system poster that includes both seismic and tsunami alerts, annotating how each component works and who it serves.
• Scaffolding for struggling students: Provide sentence starters during Think-Pair-Share, such as 'The building collapsed because _____, while the road stayed intact because _____.'
• Deeper exploration: Invite students to compare historical tsunami waveforms from different regions to identify patterns in wave behavior and coastal impact.

Key Vocabulary

Subduction Zone	An area where one tectonic plate slides beneath another, often causing powerful earthquakes and volcanic activity.
Seismic Waves	Vibrations that travel through Earth's layers, originating from the point of an earthquake's rupture.
Tsunami	A series of large ocean waves caused by sudden displacement of water, typically triggered by undersea earthquakes or volcanic eruptions.
Liquefaction	The process where water-saturated soil temporarily loses strength and acts like a liquid during intense shaking, causing structures to sink or tilt.
Fault Line	A fracture or zone of fractures between two blocks of rock, where the blocks move relative to each other.