Q: 59 (IAS/2001)

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Consider the following statements regarding the earthquakes :
I. The intensity of earthquake is measured on Mercalli scale.
II. The magnitude of an earthquake is a measure of energy released.
III. Earthquake magnitudes are based on direct measurements of the amplitude of seismic waves.
IV. In the Richter scale, each whole number demonstrates a hundredfold increase in the amount of energy released.
Which of these statements are correct ?
question_subject: 
Geography
question_year: 
2001
question_exam: 
IAS
question_sub_subject: 
Physical Geography
question_topic: 
Lithosphere
stats: 
0,2496,1952,2424,1448,376,200