Earthquakes happen when stored energy in Earth’s crust is suddenly released, sending seismic waves through rock and soil. These waves can shake buildings, roads, and classrooms, sometimes with little or no warning. Learning earthquake safety matters because quick, practiced actions can reduce injuries during the first seconds of shaking.
Prepared students can help keep themselves and others calm before, during, and after an emergency.
Inside a school, the safest response during shaking is usually to Drop, Cover, and Hold On under a sturdy desk or table. Earth science helps explain why some places shake more strongly, since local soil, distance from the epicenter, and building design affect risk. Preparedness also includes securing heavy objects, making emergency kits, knowing evacuation routes, and practicing drills.
After shaking stops, students should watch for hazards such as broken glass, damaged walls, fire alarms, gas leaks, and aftershocks.
Key Facts
- Earthquakes are caused by the sudden release of energy along faults in Earth’s crust.
- Seismic waves carry energy outward from the focus, and the epicenter is the point on Earth’s surface above the focus.
- Magnitude measures earthquake energy, while intensity describes shaking and damage at a specific location.
- Drop, Cover, and Hold On means drop to the ground, take cover under sturdy furniture, and hold on until shaking stops.
- Wave speed can be estimated with v = d/t, where v is speed, d is distance, and t is time.
- Preparedness reduces risk by securing furniture, practicing drills, storing supplies, and planning how to communicate after an earthquake.
Vocabulary
- Earthquake
- An earthquake is a sudden shaking of the ground caused by energy released from movement in Earth’s crust.
- Fault
- A fault is a crack or fracture in rock where blocks of Earth’s crust can move past one another.
- Seismic wave
- A seismic wave is a wave of energy that travels through Earth or along its surface after an earthquake.
- Epicenter
- The epicenter is the point on Earth’s surface directly above the underground focus of an earthquake.
- Emergency kit
- An emergency kit is a set of supplies such as water, food, first aid items, flashlight, and batteries used during or after a disaster.
Common Mistakes to Avoid
- Running outside during shaking is unsafe because falling glass, bricks, signs, and power lines can cause serious injuries.
- Standing in a doorway is unsafe because modern doorways are not always stronger than other parts of a building and do not protect the whole body from falling objects.
- Ignoring aftershocks is dangerous because smaller earthquakes after the main event can damage already weakened buildings and objects.
- Waiting until an earthquake happens to make a plan is risky because shaking can interrupt communication, block exits, and make it hard to find supplies quickly.
Practice Questions
- 1 A seismic wave travels 180 km in 30 seconds. What is its average speed in km/s?
- 2 A school emergency kit needs 2 liters of water per person. If 24 students and 1 teacher are in a classroom, how many liters of water are needed?
- 3 During an earthquake drill, one student wants to run to the hallway while another drops under a sturdy desk and holds on. Explain which action is safer and why.