Which risk increases substantially for older unreinforced masonry buildings during an earthquake?

💡 Explanation

When seismic waves propagate, older unreinforced masonry (URM) buildings can experience shear failure because the walls lack sufficient tensile strength and connection at floor levels, leading to 'pancaking'. Therefore, pancaking is a significant risk, rather than combustion, tsunami resonance, or liquefaction which occur through different earthquake induced mechanisms.

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