Question
In the conventional method of locating an earthquake epicentre by intersecting distance circles derived from P–S arrival-time differences, data from how many independent seismic stations are normally required?
The correct answer is
Three
In the conventional distance-circle method, each station’s P–S arrival-time difference gives an epicentral distance. Two circles can intersect at two points; a third independent station resolves the location. Hence three stations are required.
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