Final answer:
The magnitude of an earthquake is determined using the Richter scale, which measures the amount of energy released by the earthquake. Magnitudes on the Richter scale are typically whole numbers or decimals rounded to one decimal place.
Step-by-step explanation:
The magnitude of an earthquake is determined using the Richter scale. The Richter scale measures the amount of energy released by an earthquake. The magnitude is represented by numbers such as 2.3, 4.0, 6.1, and 7.0. These numbers indicate the amplitude of the seismic waves produced by the earthquake.
The magnitude of 30.25 mentioned in the question is not a valid magnitude on the Richter scale. Magnitudes on the Richter scale are typically whole numbers or decimals rounded to one decimal place.
To find the correct magnitude of an earthquake, you would need the seismic data recorded by seismographs at various locations and perform calculations based on the amplitude of the seismic waves.