Hazard map primer
Hazard exposure
for property buyers
Five MLIT-designated hazard zone classes affect Japanese residential property — flood, landslide, tsunami, storm surge, and seismic probability. Yudane does not model these (MLIT does). We surface the official designation per listing and explain on this page what each zone means in legal, insurance, and decision terms.
Live Fukuoka exposure across scored properties
0 Scored properties
0% In at least one designated zone
0% Flood zone
0% Landslide warning zone
0% Tsunami zone
0% Storm surge zone
0.0% Earthquake prob (30yr, avg)
Aggregated across the 0 active scored Fukuoka properties on Yudane today.
Japan's designated zones and disclosure obligations
洪水浸水想定区域 · Flood inundation zones
MLIT-published flood inundation zones model expected water depth in a river-flood event. Two tiers: L1 (planned scale) and L2 (maximum projected scale). Properties within designated zones must be disclosed during real estate transactions (under the Real Estate Transaction Business Act enforcement rules).
Insurance: fire-insurance flood-rider rates vary substantially by zone. A wooden house in an L2 zone can cost 3–5× the annual premium of an equivalent property outside the zone.
土砂災害警戒区域 · Landslide warning zones
Designated by prefectural governors in two tiers: "warning zone" (yellow) and "special warning zone" (red). Red zones have new-construction and expansion restrictions and substantially reduced residential value. Red-zone status must be disclosed in real-estate transactions.
Mortgages: red-zone existing-home purchases face stricter underwriting at major banks; regional banks and credit unions often apply rate add-ons.
津波浸水想定区域 · Tsunami inundation zones
Designated under the Tsunami Disaster Prevention Region Development Act. In Fukuoka Prefecture, the Genkai Sea coast (Kitakyushu, Munakata, Fukutsu, Koga) is the primary designation area. L2 tsunami designations may unlock subsidies for upgrading buildings into tsunami evacuation refuges.
高潮浸水想定区域 · Storm surge zones
Models maximum-scale typhoon-driven storm surge inundation. Climate change has expanded designated areas; in Fukuoka the Ariake Sea coast (Yanagawa, Omuta, Miyama) and Hakata Bay coast are the principal regions.
地震動予測 · Earthquake probability (NIED J-SHIS)
Computed at property coordinates from NIED's probabilistic seismic hazard map: probability of experiencing JMA seismic intensity 6-lower or stronger within 30 years. Most of Fukuoka Prefecture is in the 5–10% range, with locally elevated values along the Kego Fault Zone.
Building code: structures built under the post-1981 New Earthquake Resistance Standard or the current 2000+ standard are structurally stronger, but the probabilistic hazard at the coordinate is independent of build date.
How to check your own address
For a specific address, check the official MLIT Hazard Map Portal (disaportal.gsi.go.jp). Yudane surfaces these zones automatically on each listing detail page, but always re-verify on the official portal before any final decision.
MLIT Hazard Map Portal → · NIED J-SHIS earthquake hazard →
Insurance and mortgage implications
For property in a designated zone, first verify that the disclosure document (重要事項説明書) explicitly states the zone designation. Omission may give rise to seller liability post-contract. Always obtain a fire-insurance quotation before contract signing and use the premium uplift as a price-negotiation lever.
In mortgage underwriting, landslide special-warning (red) zones and L2 tsunami zones have the largest effect; regional banks and credit unions are often the realistic financing option.