Check the risks
before you buy
Japan is beautiful — and seismically active. Before you fall in love with a property, check what the Japanese government data says about its exposure to earthquakes, floods, tsunamis, landslides, typhoons, volcanic activity, storm surge, and liquefaction.
Beautiful listings don't show you what's underground
A riverside property in Nagano looks idyllic until you learn it's in a designated flood hazard zone. Japanese hazard maps exist — but they're in Japanese, scattered across municipal websites, and nearly impossible to cross-reference.
Two houses a kilometer apart can have completely different earthquake risk profiles depending on soil type, proximity to fault lines, and elevation. National averages tell you nothing about your specific location.
Japanese property insurance premiums are directly tied to hazard zone classifications. Knowing your risk profile before you buy helps you estimate ongoing costs — and avoid surprises after closing.
Paste a link.
Get the risk profile.
The tool pulls hazard data from Japanese government sources and computes a weighted composite score. No Japanese required — just a location.
Double-click the map, paste a Google Maps link, or enter raw coordinates. The tool accepts maps.app.goo.gl links, decimal coordinates, and DMS format.
Nine hazard categories are assessed: earthquake, flood, landslide, tsunami, typhoon, volcanic, storm surge, and liquefaction. Each is rated 1–4 with a color-coded severity level.
A weighted average (1.0–4.0) gives you the overall risk picture. Severe alerts flag any single hazard at level 4, even if the composite looks moderate.
More than a score.
A decision tool.
Built for property buyers who need actionable risk data — not academic seismology papers.
Earthquake, flood, landslide, tsunami, typhoon, volcanic activity, storm surge, and liquefaction. Each assessed independently with data from Japanese government hazard sources.
The weighted composite score (1.0–4.0) gives you the big picture. Expand the breakdown to see each hazard's contribution and individual severity level.
If you have local knowledge or a specialist report, you can manually set any hazard level (1–4) to override the estimated value and recalculate the composite.
Save properties to a comparison table to see all hazards side by side — including flood depth estimates and critical alerts. Essential when choosing between multiple locations.
If any single hazard hits level 4 (severe), a red warning appears regardless of the composite score. A "moderate average" can still hide a dangerous flood zone.
Google Maps links, coordinates, DMS format — paste anything and the tool resolves the location. Coverage spans all 47 prefectures with fallback estimates where official data is unavailable.
A ¥500,000 surprise is worse than a $9.99 check
Flood damage, earthquake reinforcement, insurance premiums you didn't plan for — hazard data doesn't change after you buy. Check it first. The tool takes 30 seconds.
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I was about to make an offer on a house in Chiba. The hazard score showed level 4 flood risk — the listing photos showed nothing. I found a safer location two towns over for less money.
A few things people ask
Where does the hazard data come from?
The tool uses publicly available hazard map data from Japanese government sources — including national seismic hazard maps, flood hazard area designations, tsunami inundation maps, and landslide warning area data. Where official data is unavailable for a specific location, the tool uses estimated fallback values based on regional averages.
How accurate is the composite score?
The composite score is a weighted average of 9 individual hazard ratings. It's designed as a screening tool — useful for comparing locations and flagging obvious risks. It is not a substitute for a professional site survey, but it gives you a solid starting point before investing time and money in a specific property.
Can I check any location in Japan?
Yes — all 47 prefectures are covered. You can double-click the map, paste a Google Maps link, enter decimal coordinates, or use DMS format. The tool resolves the location and runs the hazard lookup automatically.
What if I disagree with a hazard rating?
You can manually override any individual hazard level (1–4) using the buttons on each hazard card. This is useful if you have local knowledge, a specialist report, or recent inspection data that differs from the estimated value.
Does access expire?
It depends on your plan. Trial gives you 1 week. Quarterly renews every 3 months. Premium renews yearly. Lifetime never expires. You can cancel anytime and keep access until the end of your billing period.