Question

Which is the most destructive earthquake wave?

• A. P-wave
• B. S-wave
• C. L-wave
• D. None of these

Hint:

Surface waves (L-waves and Rayleigh waves) are responsible for almost all the damage associated with an earthquake, even though they are the slowest to arrive.

Answer 1

The Correct Option is C

Earthquakes release energy in the form of seismic waves, which are broadly classified into body waves (which travel through the Earth's interior) and surface waves (which travel along the Earth's crust).

Step 1: Analyze the options.
(A) P-wave (Primary wave): These are the fastest seismic waves and the first to arrive at a seismic station. They are longitudinal waves but generally cause the least amount of structural damage.
(B) S-wave (Secondary wave): These arrive after P-waves. They are transverse waves and can only travel through solids. While more destructive than P-waves, they are not the most damaging.
(C) L-wave (Love wave/Long wave): These are surface waves. Surface waves have higher amplitudes and lower frequencies than body waves. Because they travel along the surface where buildings and infrastructure are located, and cause horizontal shifting of the ground, they are the most destructive.
(D) None of these: This is incorrect as option (C) identifies the correct wave type.

Step 2: Conclusion.
The L-wave (surface wave) is the most destructive because it focuses its energy on the Earth's surface, leading to the collapse of structures.
Final Answer: \[ \boxed{(C) \, \text{L-wave}} \]