Which of the following scales is used to measure the intensity of earthquakes based on observed effects on people, structures, and the Earth's surface?

💡 Solution & Explanation

The Mercalli scale evaluates earthquake intensity based on subjective human observations, structural damage, and surface effects at specific locations. In contrast, the Richter scale measures the total energy released at the earthquake source using instrument recordings. The Fujita scale applies strictly to tornado wind damage intensity rather than seismic activity.