Short answer
Magnitude measures an earthquake as an event. Intensity describes how strongly it shakes or affects a particular place. The same earthquake can have one reported magnitude and many intensities, because distance, ground conditions and buildings vary. 1 2
One earthquake has an assigned magnitude but its intensity differs from place to place.
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At a glance
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| Question | Magnitude | Intensity |
|---|---|---|
| Applies to | Whole earthquake event | Specific location |
| Varies across a map? | No, for one reported estimate | Yes |
| Typical evidence | Seismic measurements | Observed shaking and effects |
The table summarizes the cited definitions and the article’s stated scope. 1 2
What each thing is
Magnitude. An event-scale measure of an earthquake’s size derived from seismic observations. 1
Intensity. A measure of the shaking and effects experienced at a particular location. 2
Key differences
Magnitude and intensity are related but not interchangeable scales. Magnitude estimates can be revised as data improve. Intensity is spatial: people nearer the rupture or on certain soils can experience stronger effects than people elsewhere during the same earthquake. 1 2
How to tell them apart
If the question is “How big was that earthquake overall?” use magnitude. If it is “How hard did it shake here?” use intensity. An intensity map shows multiple values for one event; a magnitude report gives an event-level estimate. 1 2
Where they overlap
Larger earthquakes can create stronger shaking over broader areas, but magnitude alone cannot specify what an individual location experienced. Both inform hazard communication. 1 2
Edge cases
Local geology, depth, distance and construction can complicate intuitive expectations. Damage is not solely a measure of intensity because building vulnerability matters. Different magnitude methods can yield different preliminary values. 1 2
Why the distinction exists
The distinction separates a source property from a location-dependent consequence. It makes reports useful both to scientists comparing events and to residents comparing what happened at different places. 1 2
Common misconceptions
“It was magnitude six at my house” mixes the event measure with local shaking. A person’s experience at home is intensity-related. 1 2
Examples
One earthquake is reported as magnitude 6.0. A nearby community may report severe shaking while a distant community reports weak shaking: different intensities from one event. 1 2
Sources
Sources checked October 3, 2026.
- U.S. Geological Survey — Earthquake Magnitude, Energy Release, and Shaking Intensity. Magnitude and shaking intensity.
- U.S. Geological Survey — What is the difference between earthquake magnitude and earthquake intensity?. FAQ answer.