This scale, composed of increasing levels of intensity that range from imperceptible shaking to catastrophic destruction, is designated by Roman numerals. It does not have a mathematical …

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 …

Table of earthquake intensity, witness perceptions, and damage.

Adapted from Sieberg's Mercalli-Cancani scale, modified and condensed. Note: The Modified Mercalli scale is designed to describe the effects of an earthquake, at a given place, on natural …

Some fall of tree limbs and tops, isolated rockfalls and landslides, and isolated liquefaction. Tree damage, rockfalls, landslides, and liquefaction are more severe and widespread wiht …

View MMI Shaking Intensity of Scenario Earthquakes epict possible shaking intensities from 12 different Bay Area earthquake sce arios. You can explore the earthquake scenario maps using …

Jun 13, 2025 · What is the Modified Mercalli Intensity scale? The Modified Mercalli Intensity (MMI) scale is a seismic intensity scale used to quantify the effects of an earthquake on the Earth's …

Although numerous intensity scales have been developed over the last several hundred years to evaluate the effects of earthquakes, the one currently used in the United States is the Modified …

Nov 9, 2025 · Learn the Modified Mercalli Scale (I–XII), a system used to measure earthquake intensity based on observed effects on people, buildings, and the Earth's surface.

Intensity depends on your distance from the epicenter and the geologic area. The Modified Mercalli scale measures the earthquake’s effect on people, property and ground damage.