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Interior of the Earth: Seismic Waves & others (2) Video Lecture | Geography for UPSC CSE
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| 1. What are seismic waves and how do they help us understand the interior of the Earth? |  |
Seismic waves are vibrations that travel through the Earth's interior during an earthquake or other seismic events. They provide valuable information about the Earth's structure and composition. By analyzing the speed, direction, and intensity of seismic waves, scientists can create models of the Earth's interior, including the different layers and their properties such as density and temperature.
| 2. What are the three types of seismic waves and how do they differ from each other? | |
The three types of seismic waves are primary waves (P-waves), secondary waves (S-waves), and surface waves. P-waves are the fastest and can travel through solids, liquids, and gases. S-waves are slower and can only travel through solids. Surface waves are the slowest and cause the most damage, as they travel along the Earth's surface. They move in a rolling motion, similar to ocean waves, and can cause the ground to shake horizontally and vertically.
| 3. How do seismic waves help in locating and studying earthquakes? | |
Seismic waves are crucial in locating and studying earthquakes. When an earthquake occurs, it generates seismic waves that radiate outward from the epicenter. By measuring the arrival times of these waves at different seismograph stations around the world, scientists can triangulate the earthquake's location. They can also determine the magnitude and intensity of the earthquake by analyzing the amplitude and frequency of the recorded seismic waves.
| 4. What can seismic waves tell us about the Earth's interior layers? | |
Seismic waves provide valuable information about the Earth's interior layers. By studying the behavior of seismic waves as they travel through different materials, scientists can infer the properties of these layers. For example, the speed and direction of seismic waves can reveal the boundaries between the Earth's crust, mantle, and core. They can also indicate the presence of subterranean structures such as faults, magma chambers, or even the presence of valuable mineral deposits.
| 5. How do scientists use seismic waves to study the Earth's core? | |
Seismic waves play a crucial role in studying the Earth's core. Due to the extreme conditions and inaccessibility of the core, direct observations are impossible. However, by analyzing the behavior of seismic waves that pass through the core, scientists can deduce its properties. For example, the change in speed and direction of seismic waves at the core-mantle boundary indicates a significant difference in density and composition. This information helps scientists understand the structure and dynamics of the Earth's core.
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Nov 15, 2024 Last updated |
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