Explanation:

- Seismic wave (Option 4): This is the correct answer. Seismic waves are elastic waves that travel through the Earth and are generated by natural occurrences such as earthquakes or artificial disturbances like explosions.

- Sound wave (Option 1): These are waves that travel through air or another medium and are perceived as sound; they are not typically associated with geological events like earthquakes.

- Epicentre (Option 2): This is the point on the Earth's surface directly above where an earthquake originates. It isn't a wave but refers to the location of seismic activity.

- Tectonic shift (Option 3): This refers to the movement of the Earth's plates. It's a broader concept related to seismic activity but not a type of wave.

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