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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 in the direction of waves to and from and therefore, these waves are also called forward-backward 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
Identify and name the internal movement.
Molten magma is thrown out of the earth’s mantle.
Fill in the blank:
Most earthquakes occur on account of the strain in the _________.
Fill in the blank:
About 70 percent of the earthquakes occur in the _________________ Belt.
State two natural causes of an earthquake.
Name two man-made causes of an earthquake.
Name the important Earthquake-belts of the world.
OR
Indicate two major belts of Earthquakes.
Define Earthquake.
On an outline map of the world, mark the Pacific Ring of Fire
What is the point of the earth’s surface directly above the focus called?
Choose the odd one.
focus, epicenter, vent, seismic waves
