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प्रश्न
Fill in the blank:
___________ are the first earthquake waves to be recorded on a seismograph of an earthquake.
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उत्तर
P (primary or push waves) are the first earthquake waves to be recorded on a seismograph of an earthquake.
संबंधित 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.
Identify and name the internal movement.
Molten magma is thrown out of the earth’s mantle.
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 giant sea waves caused by earthquakes in the oceans are called ___________.
What are known as seismic focus and epicenter with respect to 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. |
What is the difference between seismic focus and epicenter?
How are earthquakes distributed over the globe?
Describe the world’s distribution of earthquakes.
Give one word for the following :
An instrument used for recording all the earth tremors and earthquakes.
The magnitude of an earthquake is measured by ______.
Choose the odd one
Define Earthquake.
The earthquake is a ______ activity.
How the earthquake can be recorded?
Give a note on Tsunami 2004.
An earthquake of magnitude ______ scale can cause damage from things falling.
Choose the odd one.
focus, epicenter, vent, seismic waves
