日本語Sokoshira is a free service that lets you check the disaster risk of a location just by entering its address. Your current home, workplace, family home, or a place you're considering moving to — you can check any of them.
Enter an address to check| Hazard | What You Learn |
|---|---|
| Flooding (river overflow) | Maximum expected inundation depth, how many days it lasts, and whether buildings could collapse |
| Tsunami | How far inland a maximum-class tsunami is expected to reach |
| Storm Surge | How far inland storm surge from a typhoon is expected to reach |
| Urban (Inland) Flooding | Projected urban flood damage from heavy rain overwhelming sewers |
| Sediment Disasters | Whether the location is within a debris flow, slope collapse, or landslide caution area |
| Earthquake Shaking | Probability of seismic intensity 6-lower or greater within 30 years, and how much the ground amplifies shaking |
| Fire Spread Risk | How densely wooden buildings are packed nearby |
| Liquefaction | How prone the landform is to liquefaction |
Being told "3m of flooding" doesn't tell you how to act. Alongside each assessment, Sokoshira shows the actions you should take at that location.
A moving candidate, your current home, your family home. Compare up to 4 locations side by side, hazard by hazard. Even within the same city, a riverside lot and a plateau can have completely different results.
Governments and municipalities publish disaster/hazard maps for free. But reading them requires getting used to map symbols and color coding, and it can be hard to quickly tell "is this place actually dangerous or not."
The data Sokoshira uses is the same official data published in government and municipal hazard maps. We remove the need to decode the map yourself — reassessing it for a single address on a 5-level S–D scale, and showing the actions to take.
Adding Sokoshira to your smartphone's home screen lets you open it straight from an icon. No app store install is needed, and there is no cost.
Searching for it after a disaster has already started is hard. Adding it now means you will not have to look for it when it matters.
Safari, Chrome and Edge all work the same way. Adding from a non-Safari browser requires iOS 16.4 (March 2023) or later; on older iPhones, use Safari.
A prompt saying "Install app" may also appear near the bottom of the screen. If it does, tapping it is enough.
The exact wording can differ slightly depending on your device and browser version.
If you added it earlier and the icon artwork looks wrong, remove it and add it again. iOS stores the icon on the device and will not update it on its own.
On the Geospatial Information Authority of Japan's Hazard Map Portal Site, you can also enter an address and read the risk for that point in text. Official national and municipal information is the most reliable primary source.
What Sokoshira adds:
Sokoshira is an unofficial private service and is not operated or supervised by any government body. For important decisions such as buying or renting a home, always check official hazard maps.
Assessment results can be printed as an A4 "Household Disaster Preparedness Sheet." The first page alone gives you the full picture, and it stays readable when printed in black and white. There are also spaces to write down where your family will meet and how you will check on each other.
On the results screen, Download PDF saves the preparedness sheet to your device as a PDF file. Hand that file to one of the print apps below and you can print it on a convenience store copier in Japan. The sheet is A4 and stays readable in black and white.
Prices and how long files are kept are set by each company — see the links above. Sokoshira has no affiliation with any of them.
All of this is data published by public institutions. Sokoshira’s role is to re-present it in a form anyone can read.
Each hazard is shown on a 5-level scale. S is the most dangerous.
| Rank | Meaning |
|---|---|
| S | Extremely High |
| A | High |
| B | Moderate |
| C | Low |
| D | Not Designated |
“D (Not Designated)” does not mean “safe.” It means the location is not within any published hazard area. A disaster exceeding published projections can always occur.
Sokoshira honestly discloses what it cannot do.
No registration is required, and we do not collect any personally identifying information. Searched addresses are used only to return the assessment, and are not stored on our servers. See the Privacy Policy for details.
Sokoshira is an independent, unofficial service run by a private design office. The assessment is reference information based on published "projected scenarios" and does not guarantee safety. Before making an important decision (such as purchasing or leasing a home), always check the Hazard Map Portal Site and the latest hazard maps published by your municipality. See the Terms of Use / Disclaimer for details.
Enter an address to check