# SOLAR SYSTEM

## UNIVERSE

### PLANETARY INTERIORS

 Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
The time duration between the P and S waves recorded at a seismic station directly correlates to the ____ between the seismic station and the epicenter of an earthquake.
 A type of rock B intensity of the waves C None of these are true. D distance
Explanation:

Detailed explanation-1: -The distance of the seismic recording station from the earthquake epicenter is determined from the time difference between the first arrival of the P-wave and the S-wave. This is known as the S-P interval.

Detailed explanation-2: -How does the time between P-and S-wave arrival correlate to distance from the epicenter? The longer the time between P-and S-wave arrival, the farther the distance from the epicenter. P-waves were refracted at the boundary. the outer core is liquid.

Detailed explanation-3: -As S waves have a greater amplitude than P waves the two groups are easily distinguishable on the seismogram. By measuring the time interval between the arrivals of the P and S wave groups seismologists are able to calculate the distance between the seismograph and the origin of the earthquake.

Detailed explanation-4: -Difference in arrival times between P and S waves can be used to determine the distance between the station and an earthquake. By knowing how far away the quake was from three stations we can draw a circle around each station with a radius equal to its distance from the earthquake.

Detailed explanation-5: -Finding the Distance to the Epicenter Use the time difference between the arrival of the P and S waves to estimate the distance from the earthquake to the station. (From Bolt, 1978.) Measure the distance between the first P wave and the first S wave. In this case, the first P and S waves are 24 seconds apart.

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