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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.
- Seismic Hazard
Surface motion map for a hypothetical earthquake on the...
- Mercalli intensity scale
The Mercalli intensity scale (or more precisely the Modified...
- Seismic Hazard
Although numerousintensity 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 Mercalli (MM) Intensity Scale. It was developed in 1931 by the American seismologists Harry Wood and Frank Neumann.
Modified Mercalli scale (MM) Israel: Medvedev–Sponheuer–Karnik scale (MSK-64) Japan: JMA Seismic Intensity Scale Kazakhstan: Medvedev–Sponheuer–Karnik scale (MSK-64) Philippines: PHIVOLCS Earthquake Intensity Scale (PEIS) Russia: Medvedev–Sponheuer–Karnik scale (MSK-64) Taiwan: Central Weather Administration seismic intensity scale
- Not felt - or, except rarely under especially favourable circumstances. Under certain conditions, at and outside the boundary of the area which a great shock is felt: sometimes birds, animals, reported uneasy or disturbed; sometimes dizziness or nausea experienced; sometimes trees, structures, liquids, bodies of water, may sway - doors may swing, very slowly.
- Felt indoors by few, especially on upper floors, or by sensitive, or nervous persons. Also, as in grade I, but often more noticeably: sometimes hanging objects may swing, especially when delicately suspended; sometimes trees, structures, liquids, bodies of water, may sway, doors may swing, very slowly; sometimes birds, animals, reported uneasy or disturbed; sometimes dizziness or nausea experienced.
- Felt indoors by several, motion usually rapid vibration. Sometimes not recognized to be an earthquake at first, duration estimated in some cases.
- Felt indoors by many, outdoors by few. Awakened few, especially light sleepers. Frightened no one, unless apprehensive from previous experience. Vibration like that due to passing of heavy, or heavily loaded trucks.
16 Feb 2024. When the earth trembles, the world takes notice. But how do we measure the narrative of the ground’s fierce rumbling? Enter the Modified Mercalli Intensity Scale (MMI), a storyteller of seismic experience that narrates the drama from the ground up. Intensity vs. Magnitude: Feeling the Difference.
Methods and Analysis. Natural Hazards. What is the difference between earthquake magnitude and earthquake intensity? What is the Modified Mercalli Intensity Scale? Magnitude scales, like the moment magnitude, measure the size of the earthquake at its source. An earthquake has one magnitude.
