Explanation
An isoseismal line connects points on a map that experienced the same intensity of earthquake shaking. Therefore, "places of blending equal impact" refer to these lines of equal seismic intensity, making "Isoseismal" the correct term.
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An isoseismal line connects points on a map that experienced the same intensity of earthquake shaking. Therefore, "places of blending equal impact" refer to these lines of equal seismic intensity, making "Isoseismal" the correct term.