modified Mercalli intensity scale
seismic scale used for measuring the intensity and effects of an earthquake
AI overview
The Modified Mercalli Intensity Scale is a system that measures how strongly an earthquake is felt and what damage it causes, rather than measuring the earthquake's energy itself. It matters because it helps scientists and emergency responders understand the real-world impact of earthquakes on buildings, infrastructure, and people in different locations.
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Article
Lisbon, Portugal, during the Great Lisbon earthquake in 1755 The Modified Mercalli intensity scale (MM, MMI, or MCS) measures the effects of an earthquake at a given location. This is in contrast with the seismic magnitude usually reported for an earthquake.
Magnitude scales measure the inherent force or strength of an earthquake — an event occurring at greater or lesser depth. (The " Mw" scale is widely used.) The MMI scale measures intensity of shaking, at any particular location, on the surface. It was developed from Giuseppe Mercalli's Mercalli intensity scale of 1902.