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1.

Name some Earthquakes which caused great damage.

Answer»

Some Earthquakes which caused serious damage to property and life are : 

1. Lisbon Earthquake of 1755

2. South Carolina Earthquake of August 1886 

3. The Japan Earthquake of Oct. 28, 1891 

4. Kanga (Himachal pradesh) Earthquake of April 1905 

5. Tokyo (Japan) Sep. 1923 

6. Quetta 1935 

7. Bihar 1934 

8. California Earthquake of April, 1966 

9. Turkey Sep. 1975 

10. Iran 1968 

11. Peru 1970 

12. Tangshan (China) Earthquake of July, 1976 

13. Broach Earthquake of 1970 affected part of Gujrat. 

14. Earthquake of 1988, had its epicentre near Darbhanga and affected parts of North Bihar, Nepal and Bangladesh. 

15. The Bhuj earthquake of 2001 devastated many cities of Gujarat.
Discussion
2.

How is the intensity of earthquakes measured ? What instruments are used ?

Answer»

Ritcher scale and Mercalli scale are used to measure the intensity of earthquakes. Ritcher scale measures through a graphical scale in zigzag graph from 1 to 9 and Mercalli scale observes it from 1 to 12 points scale.
Discussion