Which of the following statements are true in the context of an earthquake?

1.The amount of ground displacement in an earthquake is called the slip

2.The point where the movement triggering an earthquake begins is called the focus

3.The order of arrivals is P waves, then S waves, then surface waves

A2 and 3

B1 and 2

C1, 2 and 3 ✓ Correct

D1 and 3

Correct answer: (C) 1, 2 and 3

Explanation

All three statements about earthquake mechanics are correct.

Statement 1 is right: the amount of ground displacement along a fault is called the slip.

Statement 2 is right: the focus is the underground point where the rupture and movement begin.

Statement 3 is right: arrivals follow the order fast P waves, then slower S waves, then surface waves.

P waves are compressional and travel fastest, so seismographs record them first.

Surface waves arrive last but usually cause the most shaking and damage.

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