QuestionFebruary 19, 2026

How do scientists use P waves and S waves to determine how far away an earthquake occurred?

How do scientists use P waves and S waves to determine how far away an earthquake occurred?
How do scientists use P waves and S waves to determine how far away an
earthquake occurred?

Solution
4.0(210 votes)

Answer

They measure the time difference between P and S wave arrivals, use known wave speeds to find distance to the epicenter, and triangulate using multiple stations. Explanation 1. Identify wave travel differences P waves travel faster than S waves, so they reach seismic stations first. 2. Measure arrival time gap Scientists record the time difference between the arrival of P waves and S waves. 3. Convert time gap to distance Using known velocities of P and S waves, they calculate distance from \text{distance} = \text{velocity} \times \text{time} . This determines how far the epicenter is from the station. 4. Use multiple stations Triangulation with data from at least three stations locates the epicenter precisely.

Explanation

1. Identify wave travel differences <br /> P waves travel faster than S waves, so they reach seismic stations first. <br />2. Measure arrival time gap <br /> Scientists record the time difference between the arrival of P waves and S waves. <br />3. Convert time gap to distance <br /> Using known velocities of P and S waves, they calculate distance from $ \text{distance} = \text{velocity} \times \text{time} $. This determines how far the epicenter is from the station. <br />4. Use multiple stations <br /> Triangulation with data from at least three stations locates the epicenter precisely.
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