# GEOLOGY

## EARTH SCIENCE

### EARTHQUAKES

 Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
Describe the moment magnitude scale, and explain why it is useful in measuring earthquakes.
 A It measures nearby earthquakes. B It measures earthquakes total energy of earthquakes near or far C It tells us how dangerous an earthquake was D It measures the size of the largest wave.
Explanation:

Detailed explanation-1: -The moment magnitude scale was designed to produce a more accurate accounting of the total energy released by an earthquake, and it calculates the earthquakeâ€™s magnitude more accurately than other measures-such as the Richter scale (ML), the body-wave scale (mb), and the surface-wave scale (MS).

Detailed explanation-2: -The moment magnitude scale is based on the total moment release of the earthquake. Moment is a product of the distance a fault moved and the force required to move it. It is derived from modeling recordings of the earthquake at multiple stations.

Detailed explanation-3: -The Richter scale measures the largest wiggle (amplitude) on the recording, but other magnitude scales measure different parts of the earthquake. The USGS currently reports earthquake magnitudes using the Moment Magnitude scale, though many other magnitudes are calculated for research and comparison purposes.

Detailed explanation-4: -The Richter magnitude of an earthquake is determined from the logarithm of the amplitude of waves recorded by seismographs.

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