Magnitude is:
A) a measure of earthquake size that is related to the energy released during the earthquake.
B) a directly measured physical quantity.
C) a value that is calculated from measurements taken during an earthquake.
D) determined using the amplitude of P and S waves.

Question

Quizplus · Accepted Answer

Magnitude is a measure of earthquake size that is related to the energy released during the earthquake. This is determined using the amplitude of seismic waves recorded during the earthquake, and is not a directly measured physical quantity. Magnitude is not calculated from direct measurements taken during an earthquake, but rather from seismic readings taken at a distance from the epicenter.

Magnitude Is