Japan Boring Logs & Geotechnical Data
197,739 public boring logs in Japan; 197,739 with digitized SPT, soil or CPT data. Sources include KuniJiban (Japan PWRI). Free to search on the map, download or query by API.
Where the data comes from
- KuniJiban (Japan PWRI)197,739
What's in a boring log from Japan
The 197,739 digitized borings carry the data engineers actually use: SPT blow counts (N-values) by depth, soil and rock descriptions, groundwater observations and, where the source ran cone penetration tests, CPT tip resistance and sleeve friction. Holes are typically about 51 ft (15 m) deep; one in twenty goes past 165 ft (50 m). Not sure what a boring log looks like? See annotated example boring logs.
How to get this data
- Map — pan to a site, click a boring, and view the log, the original PDF, or an ML soil-profile prediction. No account needed.
- Downloads — every boring exports as PDF, DIGGS XML or AGS4; draw a polygon on the map for a multi-boring export or a site report.
- API — query borings by coordinates or bounding box, pull SPT/CPT/lab records, and generate site reports programmatically.
- Contribute — have Japan boring logs that are not here yet? We take PDFs, DIGGS, AGS and spreadsheets.
This data was collected from public agencies and is republished as-is. It is a planning tool, not a substitute for a site investigation; see the terms and disclaimer. Counts refreshed 2 September 2026.
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