Geology · Glossary
Liquefaction
Updated 2026-07-18
Liquefaction is the earthquake-induced loss of strength in loose, saturated granular soil. California Seismic Hazard Zone maps identify areas where liquefaction investigation may be required, but mapped status is not a parcel-specific conclusion.
What it means
Shaking can increase pore-water pressure so soil temporarily behaves more like a fluid, causing settlement, lateral spreading, or bearing failure.
Why it matters for land decisions
Potential liquefaction can affect foundations, utilities, grading, project cost, and permit studies.
- Check CGS regulatory maps.
- Use a site-specific geotechnical investigation.
People also ask
Does a liquefaction zone mean liquefaction will occur?
No. It identifies potential conditions warranting investigation, not certainty at every location.
Can engineering mitigate liquefaction?
Often risks can be reduced through foundation, ground-improvement, drainage, or site-design measures based on geotechnical analysis.
Official sources
Related terms
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