Consider the following statements regarding the earthquakes 1 The intensity of earthquake is measure...........

World Geography (Easy) World Physical Aspects

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Consider the following statements regarding the earthquakes :

1. The intensity of earthquake is measured on Mercalli scale.

2. The magnitude of an earthquake is a measure of energy released.

3. Earthquakes magnitudes are based on direct measurements of amplitudes of seismic waves.

4. In the Richter scale, each whole number demonstrates a hundred fold increase in the amount of energy released.

Which of these statements are correct ?

1, 2 and 3

2, 3 and 4

1 and 4

1 and 3

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Explanation:

The most common standard of measurement for an earthquake is the Richter scale, developed in 1935 by Charles F. Richter of the California Institute of Technology. The Richter scale is used to rate the magnitude of an earthquake -- the amount of energy it released. This is calculated using information gathered by a seismograph.

The Richter scale is logarithmic, meaning that whole-number jumps indicate a tenfold increase. In this case, the increase is in wave amplitude. That is, the wave amplitude in a level 6 earthquake is 10 times greater than in a level 5 earthquake, and the amplitude increases 100 times between a level 7 earthquake and a level 9 earthquake. The amount of energy released increases 31.7 times between whole number values.