Which of the following statements is FALSE?

Question

BlackTom AI · Accepted Answer

Surface waves travel along the Earth’s surface and often produce the strongest, longest-lasting ground motions that damage buildings, but body waves (P and S) also reach and affect structures at the surface.

1) Relevant knowledge points and concepts
- Seismic waves are classified as body waves (P-waves and S-waves) that propagate through Earth’s interior and surface waves (Rayleigh and Love) that propagate along the surface.
- P-waves: compressional, fastest, travel through solids and fluids; usually first to arrive and typically produce smaller ground displacements.
- S-waves: shear, slower than P-waves, travel only through solids; produce stronger transverse motions that often damage structures.
- Surface waves (Love and Rayleigh): typically have larger amplitudes and longer periods, often causing the greatest damage at distances where they arrive.

2) Step-by-step reasoning
- The statement asserts surface waves are the seismic waves that affect human structures because P- and S-body waves only move through the interior of the Earth.
- While it is true that P- and S-waves propagate through the interior, that does not prevent them from reaching the surface: waves generated at a source travel outward and intersect the surface, producing ground motion there.
- P-waves arrive first and can cause initial jolt; S-waves arrive later and often produce strong shaking because of transverse shear motion; both can and do damage structures, especially near the epicenter.
- Surface waves typically cause the most prolonged and large-amplitude shaking, but they are not the only waves that affect buildings.

3) Calculations
- No numerical calculation is required; reasoning is conceptual and based on wave propagation properties.

4) Why the given answer is correct (i.e., why the statement is FALSE)
- The claim is false because it incorrectly implies P- and S-waves do not affect human structures. In reality, P- and S-waves reach the surface and contribute significantly to structural damage (S-waves in particular). Surface waves often dominate damage at intermediate distances, but body waves also affect structures.

5) Why other options are incorrect
- No other answer options were provided for comparison. If present, true statements would include facts like “P-waves are fastest” and “S-waves do not travel through liquids.”

6) Conclusion
- The statement "Surface waves are the seismic waves that affect human structures as P- and S-body waves only move through the Earth’s interior." is false, which matches the provided answer.

Which of the following statements is FALSE?Single choice

Similar Questions

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