ETULAY SCIENCE8 Q2 WEEK 3: Earthquake Waves

Summary

In this educational module on earthquake waves, students explore seismic activity through engaging activities, pre-tests, and a short story illustrating the experience of an earthquake. The lesson covers key concepts, including the types of seismic waves—primary, secondary, and surface waves—and their characteristics. Students learn how these waves provide insights into the Earth's interior and the dynamics of seismic events. Through various assessments, learners reinforce their understanding while preparing for future topics, such as typhoons, thus connecting geological phenomena with real-world implications.

Takeaways

• 😀 Seismic waves, also known as earthquake waves, are essential for understanding the Earth's interior.
• 🌍 There are two main types of seismic waves: Body Waves and Surface Waves.
• 🏃‍♂️ Primary Waves (P Waves) are the fastest seismic waves and can travel through solids, liquids, and gases.
• 🌀 Secondary Waves (S Waves) are slower than P Waves and can only travel through solids, causing side-to-side motion.
• 🌊 Surface Waves travel along the Earth's surface and are responsible for most earthquake damage.
• 📝 Students are encouraged to take pretests and post-tests to evaluate their understanding of the material.
• 👀 Observations during an earthquake include dizziness, swinging wires, and general panic among people.
• 📖 A short story illustrates the experience of an earthquake and helps students relate to the concepts being taught.
• 🧠 Activities include matching seismic waves to their characteristics and completing fill-in-the-blank statements.
• 🎉 Assessments consist of multiple-choice and true/false questions to reinforce learning about seismic waves.

Q & A

What are seismic waves, and how are they related to earthquakes?

Seismic waves, also known as earthquake waves, are waves of energy that travel through the Earth's surface and interior. They are generated by the release of energy from earthquakes.

What is the main cause of seismic waves?

The main cause of seismic waves is earthquakes, which occur due to the movement of rocks beneath the Earth's surface.

What are the two main types of seismic waves?

The two main types of seismic waves are body waves and surface waves.

What are primary waves (P waves) and how do they move?

Primary waves, or P waves, are a type of body wave that travel the fastest and can move through all states of matter (solid, liquid, and gas). They vibrate particles in a push-pull motion, similar to sound waves.

What distinguishes secondary waves (S waves) from primary waves?

Secondary waves, or S waves, are slower than P waves and cannot travel through liquids or gases. They move rock particles in a side-to-side motion.

How do surface waves differ from body waves?

Surface waves travel only along the Earth's crust and have lower frequencies compared to body waves. They are also the slowest seismic waves.

What happens to the velocity of P waves when they pass from solid to liquid media?

The velocity of P waves decreases when they pass from solid to liquid media.

Which type of seismic wave is detected first at a seismic station?

Primary waves (P waves) are detected first at seismic stations due to their speed.

What is a common observation that indicates an earthquake might occur?

Common observations before an earthquake can include unusual animal behavior, changes in water levels, or the sensation of the ground vibrating.

Why is it important to understand seismic waves?

Understanding seismic waves is crucial for earthquake preparedness, safety, and improving building designs to withstand seismic activity.