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What is an Earthquake? Video Lecture | Science Class 8

FAQs on What is an Earthquake? Video Lecture - Science Class 8

1. What causes an earthquake?

Ans. Earthquakes are primarily caused by the movement of tectonic plates beneath the Earth's surface. These plates can collide, pull apart, or slide against each other, leading to stress that eventually releases in the form of seismic waves, resulting in an earthquake.

2. How is the magnitude of an earthquake measured?

Ans. The magnitude of an earthquake is commonly measured using the Richter scale or the moment magnitude scale (Mw). The Richter scale quantifies the energy released at the earthquake's source, while the moment magnitude scale provides a more accurate measure for larger earthquakes by considering the area of the fault that slipped and the amount of slip.

3. What are the different types of earthquakes?

Ans. There are several types of earthquakes, including tectonic earthquakes, which are caused by the movement of tectonic plates; volcanic earthquakes, which occur in volcanic regions due to magma movement; and collapse earthquakes, which result from the collapse of underground caverns. Each type has distinct characteristics and causes.

4. What are the effects of an earthquake on the environment?

Ans. Earthquakes can have significant effects on the environment, including ground shaking, surface rupture, landslides, tsunamis, and liquefaction. These phenomena can lead to destruction of habitats, changes in landscapes, and alterations in water flow, impacting both ecosystems and human infrastructure.

5. How can people prepare for an earthquake?

Ans. People can prepare for an earthquake by creating an emergency plan, securing heavy furniture and appliances, having an emergency kit with essential supplies, and participating in earthquake drills. It’s also important to know safe spots to take cover during shaking, such as under sturdy furniture or against an interior wall.

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Sep 06, 2025 Last updated

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