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प्रश्न
What was the cause of the Koyna earthquake in India?
उत्तर
Koyna Dam is located in Maharashtra on the Deccan plateau. This part was considered a stable block free from earthquakes. But the Koyna earthquake in 1986 was a big surprise. In the reservoir of the dam water gathered was more than its capacity. It disturbed the local isostatic balance. It caused an earthquake and caused cracks in the rocks. It may be called a man-made earthquake.
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संबंधित प्रश्न
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.
Fill in the blank:
___________ are the first earthquake waves to be recorded on a seismograph of an earthquake.
Fill in the blank:
The giant sea waves caused by earthquakes in the oceans are called ___________.
Fill in the blank:
About 70 percent of the earthquakes occur in the _________________ Belt.
What is known as seismic focus and epicenter with respect to an earthquake?
How is the intensity of earthquakes measured? What instruments are used?
Describe the world’s distribution of earthquakes.
Name some Earthquakes which caused great damage.
Why are earthquakes related to volcanoes?
Give one word for the following :
An instrument used for recording all the earth tremors and earthquakes.
Give reasons for the following:
Folding and faulting frequently go together.
The magnitude of an earthquake is measured by ______.
Choose the odd one
Define Earthquake.
What is Seismograph?
How the earthquake can be recorded?
Name the point where the vibrations originate in an earthquake.
What is the point of the earth’s surface directly above the focus called?
Choose the odd one.
focus, epicenter, vent, seismic waves
