The strength of an earthquake can be measured by a _ scale, while the aftereffects or damage from an earthquake is measured by a _scale.

The correct answer is:

Richter/Magnitude & Intensity scale

Earthquakes, until lately, have been marked on the Richter scale. The Richter scale estimates the extent of an earthquake (how powerful it is). It is estimated using a tool called a seismometer which gives a seismograph. The intensity is a strength of the effects of an earthquake. Using a 12-point scale, it explains the importance of an earthquake for people and homes in a particular place.