Inputs
Detailed display
Maintains detailed display state in shared URL.
Results
These results are for learning only and are not intended to determine the actual level of risk.
| Item | value |
|---|---|
| Shake coefficient F_shake | — |
| Groundwater coefficient F_gw | — |
| Soil coefficient F_soil | — |
| PGA Conversion (gal) | — |
score = 100 × F_shake × F_gw × F_soil
Sensitivity graph (groundwater level)
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Explanation (for learning)
- The stronger the shaking, the more likely liquefaction will occur.
- The shallower the groundwater level, the more likely liquefaction will occur.
- The looser the sand, the more likely it is that liquefaction will occur.
Practical evaluation requires N value, CPT, particle size distribution, layer structure, seasonal variation of groundwater level, seismic motion evaluation, etc.
FAQ
What is liquefaction?
This is a phenomenon in which sandy ground temporarily loses its strength due to earthquake shaking, causing subsidence and sand blowing.
What does this tool calculate?
A learning coefficient is applied to the strength of shaking, groundwater level, and ground category, and a simple score from 0 to 100 is displayed.
Can it be used in practice?
Cannot be used. It is not a substitute for practical judgment involving ground investigation and professional evaluation.
Is a higher score more dangerous?
This is a guideline for learning. It is not intended to determine the actual level of risk.
What should I enter first?
Start with the shaking level and groundwater condition, then choose the soil category. Those inputs drive the educational score more than small changes in display rounding.
How to use the liquefaction education indicator effectively
What this calculator does
This page turns simplified shaking, groundwater, and soil-category inputs into an educational score. It is designed for learning how the factors interact, not for site safety certification.
Input meaning
Groundwater close to the surface and loose sandy soil increase the score in this simplified model. Use consistent assumptions when comparing two scenarios.
Use-case sequence
Run a baseline soil and groundwater case first, then change one condition at a time. This makes it clear whether the score changed because of shaking, water level, or soil category.
Common mistakes to avoid
Do not treat the score as a replacement for a geotechnical investigation, hazard map, boring log, or engineering review. The model is intentionally simple.
Interpretation guidance
Use the score to discuss relative conditions and classroom sensitivity checks. For real properties or infrastructure, rely on local hazard information and qualified professional evaluation.
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