GeoLiquefy · Liquefaction Hazard Engine

Paste a CPT profile and screen it layer by layer.

This is the CPT door. Give it depth, qc and fs for the whole sounding; the server derives Ic, picks the critical layer, and screens it against the documented field case histories in the Next Generation Liquefaction (NGL) database.

Case record
NGL field case histories
You paste
depth, qc, fs (u2 optional)
Deliverable
PDF and CSV, HMAC-signed
When to use this door

Use it when you hold a full CPT trace and want the critical layer chosen from the data rather than by hand. Server-side selection is auditable and you can override the depth window before running.

When to use the other door

Use the manual door when you hold layer values rather than a trace: SPT blow counts, shear wave velocity, or a single already-chosen CPT layer. Both doors run the same screening and return the same deliverable.

Working from layer values, SPT or Vs? Enter them at the manual door.

Liquefaction screening against NGL case histories. GeoLiquefy LLC is independent and not affiliated with the NGL project. FAQ

GeoLiquefy
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CPT Profile Input

1

Paste CPT Profile Data

Paste up to four columns from your CPT software: depth, qc (tip resistance), the friction column (fs or Rf), and an optional u2 (pore pressure) column. Comma- or tab-separated, with a header row, one reading per line. Set the units for each column below: we preselect what we detect from your header, but your selection is what we use. The critical layer you select is matched against the Next Generation Liquefaction (NGL) database, more than 8,600 documented field case histories.

Minimum 10 rows of data (plus the header row).
2

Profile Visualization & Critical Layer

Critical Layer (Auto-selected)
Why this layer?

The critical layer is the 1 m depth window (between 0.5 m and 15 m) with the lowest average cone resistance (qc): the weakest sand-like zone, which controls liquefaction susceptibility. Fine-grained readings (friction ratio above 5%, or Ic above 2.6) are excluded so the window stays within the clean-sand framework the screening curves are calibrated for. Adjust the depth range below if your judgment differs.

Adjust Critical Layer (optional)
Reset to auto-selection
Layer screening extras (optional)
The critical layer answers 3 of 8 screening questions by itself (a data-thin result). Add any one extra to reach a risk level.
Seismic hazard
Site conditions
Prefilled from the GWT depth above; edit if different.

Whole-Profile Matches

Liquefied
#SiteScoreShared PtsTop Divergent BandLiq ObservedNGL
Not Liquefied
#SiteScoreShared PtsTop Divergent BandLiq ObservedNGL

Results

Insufficient data for a risk level.
Case-history comparison complete.
Layer-by-layer profile screening Stage 3 of 3 · decision per boring/CPT
AI Engineering Analysis
This memo failed automated compliance checks and is shown as generated. Verify its contents against the screening result above before relying on it.
Case History Comparison CSR vs normalized tip resistance (qc1N,cs)
Liquefied case Non-liquefied case Engineer’s input Hollow marks with no fines datum plot on raw qc1N, not qc1N,cs
#Site / EventPGA / Mwqc / N60Fines % / D50Vs / DepthOutcomeSimilarity

Liquefaction screening against NGL case histories. GeoLiquefy LLC is independent and not affiliated with the NGL project. The full statement is in the Terms of Use.

GeoLiquefy LLC, Liquefaction Hazard Engine (CPT Profile Tool)
geoliquefy.com · Brandenberg et al. (2020) · Boulanger & Idriss (2014) · DOI: 10.21222/C2J040