It is measured using a machine called a seismometer. Beno Gutenberg and Charles F. Richter, both of whom were American seismologists in the year 1935, created it. Size calculations are tied to an earthquake’s seismic moment rather than to the amplitudes of waves recorded by seismographs. Earthquakes are measured using seismographs, which monitor the seismic waves that travel through the Earth after an earthquake strikes. The magnitude do not depend on where the measurement is made. The magnitude of an earthquake is measured by determining the height of the biggest seismic wave shown on a scale by a seismograph. An earthquake has one magnitude. Moment magnitude, a quantitative measure of an earthquake’s magnitude (or relative size), developed in the 1970s by Hiroo Kanamori and Thomas C. Hanks. Often, several slightly different magnitudes are reported for an earthquake. The Richter scale measures the magnitude of an earthquake (how powerful it is). Magnitude: Earthquake Effects: Estimated Number Each Year: 2.5 or less: Usually not felt, but can be recorded by seismograph. The Richter scale is a numeric measure of the magnitude of an earthquake. The seismograph records the motion of the ground during an earthquake. There are two primary scales used to measure earthquakes: the Richter scale and the Mercalli scale. The seismograph and the seismoscope are the two main instruments used to measure the strength of earthquakes. The Richter scale is most common in the United States, while worldwide, scientists rely on the Mercalli scale. The moment magnitude scale is another earthquake measurement scale used by some seismologists. The seismoscope is a simple instrument that measures the time that an earthquake takes place. Today, an earthquake's size is typically reported simply by its magnitude, which is a measure of the size of the earthquake's source, where the ground began shaking. Magnitude scales , like the moment magnitude, measure the size of the earthquake at its source. which produces a seismograph.

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