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प्रश्न
Give a geographical reason.
Buildings collapsed at the foothills of the Himalayas because of an earthquake. Before collapsing, they were moving forward and backward.
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उत्तर
- The seismic waves can be divided into primary, secondary, and surface waves.
- When energy is released from the Earth’s interior, the primary waves are the first to reach the surface.
- Subjected to a ‘P’ wave, particles in the rock move to and fro in the direction of the wave; therefore, these waves are also called forward-backwards waves.
- Thus, during an earthquake, the buildings at the foothills of the Himalayas moved forward and backwards as they were first subjected to “P” waves.
- These movements create tremendous tension in the earth’s crust, and when the tension goes beyond limits, the energy is released in the form of waves, which is the cause of the trembling of the earth’s surface.
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संबंधित प्रश्न
For the formation of a rift valley, which of the following processes should occur in the earth’s crust?
Fill in the blank:
The giant sea waves caused by earthquakes in the oceans are called ___________.
What is known as the Richter scale?
Describe how earthquakes are caused on the surface of the earth.
How are earthquakes distributed over the globe?
Earthquakes occur in the Mid-Atlantic belt.
Give two major causes of earthquakes.
Give one word for the following :
An instrument used for recording all the earth tremors and earthquakes.
Give one word for the following :
The surface position immediately above the origin of an earthquake.
The earthquake waves are recorded by an instrument known as ______.
