The absolute magnitude of a quake is conventionally reported by numbers on the Moment magnitude scale (formerly Richter scale, magnitude 7 causing serious damage over large areas), whereas the felt magnitude is reported using the modified Mercalli intensity scale (intensity II-XII).
seismograph is generally used to measure earthquakes.
Magnitude
The standard units used to measure the magnitude of earthquakes are the Richter scale and the moment magnitude scale.
Earthquake measure
A seismometer would measure earthquakes, but there is no such activity on the moon to measure.
Seismographs are used to measure earthquakes, and how violent they are.
A seismograph is an instrument used to measure the strength of earthquakes.
Charles Richter
Seismograph
Richter
they used a seismograph
yes it is