Question

The reason for decreasing of seismic wave energy with the distance is

• A. Scattering
• B. Absorption
• C. Scattering and Absorption
• D. Entrapped air

Hint:

As seismic waves travel away from their source, their energy steadily decreases. This loss of energy with distance is called attenuation.

Answer 1

The Correct Option is C

Step 1: Name the effect.
As seismic waves move away from their source their energy keeps dropping; this loss with distance is called attenuation.

Step 2: Find the first cause.
Scattering happens when the wave hits small irregularities and rocks of differing properties, sending its energy off in many directions.

Step 3: Find the second cause.
Absorption happens when part of the wave energy turns into heat inside the rock due to internal friction.

Step 4: Combine the causes.
Both scattering and absorption act together to weaken the wave as it travels.

Step 5: Check the options.
Since both processes matter, the choice that names both is correct, not either one alone.

Step 6: Conclude.
The energy decreases due to scattering and absorption.
\[ \boxed{\text{Scattering and Absorption}} \]