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Nilanjan Bhowmick AIR 3, CSIR NET (Earth Science)
Owishi Sarkar
The distance of a seismic station from the epicenter of an earthquake is the epicentral distance. The difference in travel times for P and S waves can be obtained directly from the seismogram. The epicentral distance D is given by D = (ts - tp)/(1/Vs - 1/Vp). Explanation is given in the attachment.