Which risk increases when construction occurs atop an ancient, inactive fault line within a large alluvial basin?

💡 Explanation

When buildings are constructed on alluvial basins near inactive faults, the unconsolidated sediment amplifies seismic waves, and shaking causes liquefaction because pore water pressure increases, reducing soil strength. Therefore, liquefaction risk rises, rather than compressive strength reduction, gas accumulation, or corrosion, which require chemical/environmental effects.

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