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Which mechanism increases building collapse risk during liquefaction caused by seismic waves?

A)Resonant frequency amplification of shaking
B)Shear strength reduction within saturated soil
C)Torsional stress from offset fault rupture
D)Surface wave reflection amplifying displacement

💡 Explanation

During liquefaction, seismic waves cause saturated soil to lose shear strength because pore water pressure increases, reducing effective stress, increasing collapse risk. Therefore diminished soil shear strength results, rather than resonance, torsion or reflection, all of which involve different triggering conditions and failure modes.

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