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Triangulation is a process to locate an earthquake. Which statements are true regarding this process?

Three seismograph distances must be mapped with circles and the point where they intersect is the epicenter.
You should draw a line from the center of the seismograph station to the epicenter to show its location.
Only one seismograph is needed to locate an earthquake.
You must know the difference in the times that S waves and P waves arrive at a seismograph station to determine the distance to the epicenter.

1 answer

The true statements regarding the triangulation process to locate an earthquake are:

  1. Three seismograph distances must be mapped with circles, and the point where they intersect is the epicenter.
  2. You must know the difference in the times that S waves and P waves arrive at a seismograph station to determine the distance to the epicenter.

The other statements are not accurate:

  • You should draw a line from the center of the seismograph station to the epicenter to show its location. (This is not what triangulation entails; you actually draw circles based on distances.)
  • Only one seismograph is needed to locate an earthquake. (This is false; you need at least three seismographs to triangulate the epicenter accurately.)