Discussion
Assertion (A): A single seismograph station cannot determine the location of an earthquake.
Reason (R): One station can estimate the distance but not the direction.
Select the correct option.
Answer: B
Correct answer: Both A and R are true, and R is the correct explanation of A
Both are true and the reason gives the mechanism. The S minus P interval fixes the distance, but a single station has no reliable way of determining the azimuth, so the epicentre may lie anywhere on a circle around it. Three stations give three circles that intersect at one point. Array processing and three-component particle-motion analysis can estimate direction from one site, but only crudely.
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