What does the Mercalli Intensity Scale measure?

The Mercalli Intensity Scale measures the intensity and effects of an earthquake based on observations from people who experienced it and the resulting damage to structures and the ground. Unlike magnitude scales, which quantify the energy released at the source of the earthquake, the Mercalli Scale provides a subjective assessment of how the earthquake is felt in various locations and is influenced by factors such as distance from the epicenter, building construction, and local geology. This scale ranges from I (not felt) to XII (total destruction), allowing for a comprehensive understanding of an earthquake's impact on communities and the environment. It effectively captures the human experience and physical damage, making it valuable for assessing the real-world effects of seismic events.