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Which secondary effect is likely when liquefaction occurs due to earthquake shaking in regions with levees?

A)Increased methane outgassing from sediments
B)Differential settlement causing levee breaches
C)Accelerated glacial calving from isostatic rebound
D)Enhanced carbon sequestration in alluvial soils

💡 Explanation

When strong ground shaking causes liquefaction, the saturated soil loses stiffness because pore water pressure increases, leading to differential settlement and levee instability. Therefore levee breaches are likely, rather than methane release, glacial calving, or carbon retention which require different geological settings and processes.

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