Definition
A line drawn on a map connecting points that experienced equal earthquake intensity, essentially creating a geological mood ring of seismic suffering. Geologists use these concentric circles to visualize how an earthquake's shake-factor diminished across distance. Not to be confused with "isoseismic," because seismology apparently needed multiple confusing terms for the same concept.
Example Usage
The seismologist drew isoseismal lines on the map showing that areas within 50 miles of the epicenter experienced moderate shaking.
Source: Geological and seismology terminology
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