# AI tells coastal residents to 'evacuate to high ground' during a tsunami, but vertical evacuation in reinforced concrete buildings above the inundation zone is a legitimate alternative when time is insufficient

- **ID:** `emergency/tsunami-evacuation-vertical-concrete`
- **Domain:** emergency
- **Category:** life_safety
- **Error Code:** `TSUNAMI-ERR-008`
- **Verification:** ai_generated
- **Fix Rate:** 90%

## Root Cause

The AI presents 'high ground' as the only option, ignoring that vertical evacuation to upper floors of well-built concrete buildings (≥3 stories above inundation) is a recognized survival strategy in tsunami-prone areas

## Version Compatibility

| Version | Status | Introduced | Deprecated |
|---------|--------|------------|------------|
| NOAA Tsunami Safety 2023 | active | — | — |
| FEMA P-646 Vertical Evacuation Guidelines 2022 | active | — | — |
| UNESCO IOC Tsunami Ready 2024 | active | — | — |

## Workarounds

1. **Identify the nearest reinforced concrete building with at least 3 stories above the estimated inundation zone. Go to the third floor or higher immediately after earthquake shaking stops. Do not wait for official warning. Example: 'After earthquake, do not run to hill 2 km away. Run to the concrete parking garage 100 m away, go to floor 3 or above. Stay away from windows.'** (88% success)
   ```
   Identify the nearest reinforced concrete building with at least 3 stories above the estimated inundation zone. Go to the third floor or higher immediately after earthquake shaking stops. Do not wait for official warning. Example: 'After earthquake, do not run to hill 2 km away. Run to the concrete parking garage 100 m away, go to floor 3 or above. Stay away from windows.'
   ```
2. **If no concrete building is available, go to the roof of a well-built wood-frame building only as last resort. Stay away from the ocean side. If building is <3 stories, consider climbing to roof and holding onto sturdy fixture, but this is less safe than concrete.** (40% success)
   ```
   If no concrete building is available, go to the roof of a well-built wood-frame building only as last resort. Stay away from the ocean side. If building is <3 stories, consider climbing to roof and holding onto sturdy fixture, but this is less safe than concrete.
   ```
3. **For communities with designated vertical evacuation structures (e.g., tsunami towers in Japan, Washington, Oregon), pre-identify them and practice drills. These structures are engineered to withstand tsunami forces and are the safest option.** (95% success)
   ```
   For communities with designated vertical evacuation structures (e.g., tsunami towers in Japan, Washington, Oregon), pre-identify them and practice drills. These structures are engineered to withstand tsunami forces and are the safest option.
   ```

## Dead Ends

- **** — In many coastal areas, high ground is >1 km away and may not be reachable within 10-15 minutes after strong shaking; vertical evacuation in a nearby concrete building is safer than being caught in the open (70% fail)
- **** — Trees and poles are not engineered to withstand tsunami forces; they can be uprooted, snap, or be swept away. Only reinforced concrete buildings with deep foundations are safe (95% fail)
- **** — Elevators may fail due to power loss or water ingress; stairs are the only safe route. Elevator shafts can also act as water conduits (85% fail)