Two people describe the same earthquake very differently. One barely noticed it, while the other felt strong shaking. Meanwhile, a news report gives a single magnitude.
These accounts do not necessarily conflict.
Magnitude describes the size of the earthquake at its source. Intensity describes shaking and its effects at a particular location. Understanding the distinction makes earthquake reports easier to interpret and helps prevent a single number from carrying more meaning than it can support.
Magnitude describes the event
The US Geological Survey explains that magnitude scales estimate the earthquake’s size at its source.
An earthquake is associated with a magnitude estimate, but different methods and available observations can produce slightly different reported values. The calculation is based on seismic information rather than a simple count of what people felt.
This is why a reported value should be read together with its issuing organization, magnitude type, and update time.
A revised figure does not automatically imply that the physical event changed. It may reflect a different estimate as the evidence is processed.
When comparing reports, first check that they refer to the same event and the same stage of analysis.
Intensity describes a location
The shaking produced by an earthquake varies from place to place. USGS identifies distance, surface materials, and other factors as contributors to that variation.
A location close to the source and another farther away can experience different shaking. Local conditions also matter, so distance alone does not provide a complete explanation.
Intensity information therefore belongs on a map or in a location-specific account.
A statement that an earthquake “felt stronger here” describes an experience at that place. It does not, by itself, establish that the earthquake’s magnitude was larger than reported.
This distinction is particularly useful when comparing eyewitness accounts from different neighborhoods.
Avoid turning magnitude into a damage forecast
Magnitude is important, but a number alone does not describe the condition of every building or the consequences across an affected area.
A useful report separates the event measurement from observed impacts. The first explains the earthquake’s scale; the second requires information about particular places and structures.
For example, a magnitude update and a local damage assessment are different kinds of evidence. They should not be presented as interchangeable confirmations of one another.
The same care applies to photographs. An image may document a local effect without representing the whole affected region.
Read the measurement label
“Richter scale” is often used casually, but USGS explains that modern earthquake reporting uses several magnitude types. Moment magnitude is widely relevant, while local magnitude remains useful in particular settings.
Preserve the measurement label supplied by the responsible scientific organization when it is available.
Avoid adding a familiar scale name merely to make a headline sound more complete. Doing so can replace precise source information with an inaccurate generalization.
Compare reports methodically
For any earthquake summary, check the event time, location, depth, magnitude estimate, issuing source, and update time. Then read intensity and impact information separately.
If two reports differ, identify which field changed before concluding that they contradict each other.
This approach keeps the scientific measurement connected to its meaning. One number describes the event’s size; location-based observations explain how that event was experienced across the region.