Answer: The correct answer is mechanical wave.
Step-by-step explanation:
A shock wave is produced during an earthquake. A shock wave is an area of of very high pressure created when an object travels faster than the speed of the sound. Shock waves are mechanical wave. It requires a medium to travel.
An electromagnetic wave does not require an medium to travel. A gamma ray and a radio wave are electromagnetic wave. Electromagnetic waves are transverse wave.
Therefore, a scientist is studying a shock wave from an earthquake. The shock wave is a kind of a mechanical wave.