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प्रश्न
What is the difference between seismic focus and epicenter?
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उत्तर
| Seismic Focus | Epicenter |
| The point inside the Earth where the earthquake originates and where the seismic waves are first generated. | The point on the Earth’s surface directly above the seismic focus. |
| Also called the hypocentre. | Located at the surface above the focus. |
| Located beneath the surface, often at a depth of 8 to 35 km. | Lies on the Earth’s surface, directly above the seismic focus. |
| Seismic waves radiate outward from this point. | Earthquake tremors are often felt most strongly near the epicentre. |
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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?
Arrange the following statements in chronological order in which an earthquake occurs.
- The earth’s surface vibrates.
- The plates suddenly move.
- Due to the movements in the mantle, compression goes on increasing.
- Along the weak points ( faultlines) rocks break apart.
- Stored energy is released in the form of seismic waves.
Give reasons why an earthquake occurs.
Fill in the blank:
The last of the earthquake waves to arrive on the surface of the earth are ___________ waves.
Fill in the blank:
The giant sea waves caused by earthquakes in the oceans are called ___________.
What is called an earthquake?
Match the Columns.
| Column A | Column B |
| 1. Tsunami | (a) The waves that make the inhabitants feel the ground motion. |
| 2. Seismograph | (b) The instrument for measuring the intensity of earthquakes. |
| 3. S-waves | (c) Harbour waves generated by oceanic earthquakes. |
| 4. Richter scale | (d) The point on the earth surface directly above the seismic focus. |
| 5. Epicentre | (e) An instrument for recording the movement of earthquake waves. |
How an earthquake is caused?
Describe the world’s distribution of earthquakes.
Name three causes of Earthquakes.
Give one word for the following :
An instrument used for recording all the earth tremors and earthquakes.
Give reasons for the following:
Internal processes are different from external processes.
Seismology is the study of ______.
What is Seismograph?
How the earthquake can be recorded?
Give a note on Tsunami 2004.
In India, the Himalayan region and the ______ valley are prone to earthquakes.
What is the point of the earth’s surface directly above the focus called?
