Which of the following statements are true?

1.Three seismograph stations are needed to locate the epicentre

2.Ninety percent of earthquakes occur at plate boundaries

3.Body waves consist of P and S waves

4.The most destructive earthquake waves are the surface waves

A2, 3 and 4

B1, 2 and 3

C1, 2, 3 and 4 ✓ Correct

D1, 3 and 4

Correct answer: (C) 1, 2, 3 and 4

Explanation

All four statements are correct.

Statement 1 is right: three seismograph stations are needed to triangulate and fix the epicentre.

Statement 2 is right: about ninety percent of earthquakes occur along plate boundaries.

Statement 3 is right: body waves consist of the P waves and S waves that travel through the interior.

Statement 4 is right: surface waves are usually the most destructive of all earthquake waves.

Triangulation uses the P-to-S arrival gap at each station to measure distance to the source.

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