Traditional Mountain Farmhouse in Nagano

This property is within a designated flood inundation zone. It means the area could be submerged if a nearby river overflows during a heavy rainfall event.

Source: MLIT DisaPortal — worst-case flood modeling per the Flood Control Act.

This property is within a designated tsunami inundation zone. Japan's coastlines face periodic tsunami risk from offshore earthquakes.

Source: MLIT DisaPortal — prefectural tsunami estimates based on worst-case offshore earthquake scenarios.

This property is within a storm surge zone. Storm surges occur when typhoon-force winds and low pressure push seawater inland, often compounding rainfall flooding near coasts.

Source: MLIT DisaPortal — storm surge scenarios modeled under worst-case typhoon conditions.

This property is within or adjacent to a landslide-prone area. Landslides in Japan are most common during prolonged heavy rainfall (梅雨, typhoons) and after earthquakes that saturate or destabilize slopes.

Source: MLIT DisaPortal — sediment disaster hazard zones per the Sediment Disaster Prevention Act.

This property is within a Steep Slope Collapse Hazard Zone — an officially designated area where a slope of 30° or steeper could fail, threatening buildings below.

Source: MLIT DisaPortal — steep slope failure zones per national and prefectural designation.

This property is near a debris flow hazard zone — a mountain stream or valley where intense rainfall can trigger a fast-moving slurry of water, rock, and sediment.

Source: MLIT DisaPortal — debris flow hazard zones per the Sediment Disaster Prevention Act.

This property is within a volcanic hazard zone. Japan has over 100 active volcanoes, and municipalities maintain hazard maps showing potential reach of lava, pyroclastic flows, ashfall, and lahars.

Source: MLIT DisaPortal — volcanic hazard zones per JMA and prefectural designations.