Answer:The time difference between the arrival of the first P-wave and the first S-wave at two different seismograph stations can be used to determine the distance to the earthquake epicenter.
P-waves (Primary waves) are faster than S-waves (Secondary waves) and travel through the Earth's interior, while S-waves are slower and travel through the Earth's crust.
When an earthquake occurs, P-waves are the first waves to arrive at a seismograph station, followed by S-waves. The time interval between the arrival of the first P-wave and the first S-wave is therefore a measure of the time it takes for the seismic waves to travel from the earthquake epicenter to the seismograph station, and this time difference increases with distance from the epicenter.
The exact time difference between the arrival of the first P-wave and the first S-wave will depend on the distance between the earthquake epicenter and the two seismograph stations, as well as the seismic properties of the Earth's interior. However, in general, the time difference between the arrival of the first P-wave and the first S-wave will be greater for seismograph stations farther away from the epicenter, as the waves will have to travel a longer distance through the Earth's interior and crust to reach the stations.
Step-by-step explanation: