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प्रश्न
What are known as seismic focus and epicenter with respect to an earthquake?
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उत्तर
The point of origin of earthquake waves is called the seismic focus, and the center vertically above the seismic focus nearest to the earth’s crust is called the epicenter.
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संबंधित प्रश्न
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.
Fill in the blank:
Most earthquakes occur on account of the strain in the _________.
Fill in the blank:
The last of the earthquake waves to arrive on the surface of the earth are ___________ waves.
Fill in the blank:
About 70 percent of the earthquakes occur in the _________________ Belt.
State two natural causes of 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. |
Describe how earthquakes are caused on the surface of the earth.
What is the difference between seismic focus and epicenter?
How are earthquakes distributed over the globe?
What is an Earthquake?
How an earthquake is caused?
Name the instrument used to record Earthquakes.
Name the causes of earthquakes.
Answer the following:
A volcanic eruption is one of the main causes of earthquakes.
Give one word for the following :
The surface position immediately above the origin of an earthquake.
The magnitude of an earthquake is measured by ______.
Choose the odd one
The earthquake is a ______ activity.
Choose the odd one.
focus, epicenter, vent, seismic waves
