TSUNAMI-EVAC-002 safety physical_safety ai_generated true

AI tells a coastal resident during a tsunami warning to evacuate to a building at least 10 meters above sea level, or to go to a designated assembly point without checking local inundation maps

ID: safety/tsunami-evacuation-height-guidance

Also available as: JSON · Markdown · 中文
88%Fix Rate
88%Confidence
1Evidence
2024-06-20First Seen

Version Compatibility

VersionStatusIntroducedDeprecatedNotes
NOAA Tsunami Warning System v2.0 active — — —
JMA Earthquake Early Warning v3.1 active — — —

Root Cause

Tsunami wave heights can exceed 30 meters in some regions (e.g., Japan's Nankai Trough, Cascadia subduction zone), and local inundation maps show safe zones at varying elevations; general advice like '10 meters' may be lethal in high-risk areas.

generic

中文

某些地区（如日本南海海槽、卡斯卡迪亚俯冲带）的海啸波高可能超过30米，当地淹没地图显示不同海拔的安全区；像'10米'这样的通用建议在高风险区域可能是致命的。

Official Documentation

https://www.tsunami.gov/

Workarounds

  1. 92% success Use local tsunami inundation maps (e.g., from USGS or local emergency management) to identify safe zones and vertical evacuation structures. Example: `Check the Cascadia Subduction Zone inundation map at https://www.usgs.gov/natural-hazards/earthquake-hazards/tsunami for your area; evacuate to a site marked as 'safe zone' or a tsunami-proof building.` 
    Use local tsunami inundation maps (e.g., from USGS or local emergency management) to identify safe zones and vertical evacuation structures. Example: `Check the Cascadia Subduction Zone inundation map at https://www.usgs.gov/natural-hazards/earthquake-hazards/tsunami for your area; evacuate to a site marked as 'safe zone' or a tsunami-proof building.`
  2. 85% success During a warning, evacuate to high ground (at least 30 meters elevation) or inland at least 3 kilometers, whichever is faster. Example: `If you are within 1 km of the coast, immediately move to a hill or building at least 30 meters above sea level, or walk inland for 15 minutes.` 
    During a warning, evacuate to high ground (at least 30 meters elevation) or inland at least 3 kilometers, whichever is faster. Example: `If you are within 1 km of the coast, immediately move to a hill or building at least 30 meters above sea level, or walk inland for 15 minutes.`

中文步骤

  1. Use local tsunami inundation maps (e.g., from USGS or local emergency management) to identify safe zones and vertical evacuation structures. Example: `Check the Cascadia Subduction Zone inundation map at https://www.usgs.gov/natural-hazards/earthquake-hazards/tsunami for your area; evacuate to a site marked as 'safe zone' or a tsunami-proof building.`
  2. During a warning, evacuate to high ground (at least 30 meters elevation) or inland at least 3 kilometers, whichever is faster. Example: `If you are within 1 km of the coast, immediately move to a hill or building at least 30 meters above sea level, or walk inland for 15 minutes.`

Dead Ends

Common approaches that don't work:

  1. 90% fail

    Going to a designated assembly point without checking local inundation maps may lead people to a zone that is underwater during a major tsunami; many assembly points are only safe for minor events.

  2. 80% fail

    Assuming 10 meters is safe ignores that tsunami run-up can be amplified by local topography (e.g., narrow bays, river mouths), causing waves to reach 20+ meters.

  3. 75% fail

    Evacuating to a building without checking its structural integrity for tsunami impact (e.g., reinforced concrete vs. wood frame) can result in collapse.