Which outcome occurs when seismic waves encounter unconsolidated sediments overlying bedrock during an earthquake?

💡 Explanation

When seismic waves travel into unconsolidated sediments, shear waves cause loosely packed grains to lose contact, decreasing effective stress and increasing pore water pressure, causing liquefaction. Therefore liquefaction potential is increased, rather than reduced amplitude, shear velocity decrease alone or increased rupture, which require different geological mechanisms.

• Which risk increases adjacent to a river reach where artificial levees have been recently constructed?
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• Which outcome occurs in an estuarine delta when freshwater stream flow diminishes significantly?
• Which process drives magma differentiation at subduction zones?
• Which mechanism causes increased sediment deposition in the cutoff area of a forming oxbow lake?
• Which event triggers landscape evolution of oxbow lake's infill?