Aseismographic station receives s and p waves from an earthquake, separated in time by 17.8 s. assume the waves have traveled over the same path at speeds of 4.50 km/s and 6.90 km/s. find the distance from the seismograph to the focus of the quake.

D = 230.2 Km

Explanation:

let distance between seismograph and focus of quake is D

From time distance formula we  can calculate the time taken by the S wave

From time distance formula we  can calculate the time taken by the P wave

It is given in equation both waves are seperated from each other by 17.8 sec

so we have

sec

Putting both time value to get distance value

D = 230.2 Km