SAFETY-TSUNAMI-EVAC-001 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 shelter exactly 1 km inland

ID: safety/tsunami-evacuation-vertical-height

Also available as: JSON · Markdown · 中文
85%Fix Rate
88%Confidence
1Evidence
2023-11-01First Seen

Version Compatibility

VersionStatusIntroducedDeprecatedNotes
tsunami-warning-system-v1.0 active — — —
coastal-evacuation-guidelines-2023 active — — —

Root Cause

Tsunami inundation height depends on local bathymetry, coastal geometry, and earthquake magnitude; a fixed 10-meter elevation or 1-km distance from shore ignores the variability of wave run-up (can exceed 30 meters in some regions) and the fact that the safest evacuation is to high ground (natural or structural) as high as possible, not to a pre-determined arbitrary height or distance.

generic

中文

海啸淹没高度取决于当地海底地形、海岸几何形状和地震震级；固定的10米高程或离岸1公里距离忽略了波浪爬高的可变性（某些地区可能超过30米），且最安全的疏散是尽可能高的高地（自然或结构），而非预定任意高度或距离。

Official Documentation

https://www.ready.gov/tsunamis

Workarounds

  1. 90% success Check local tsunami evacuation maps from official sources (e.g., USGS, NOAA, Japan Meteorological Agency) for your specific location; use the 'Tsunami Evacuation Route' signposts in coastal towns 
    Check local tsunami evacuation maps from official sources (e.g., USGS, NOAA, Japan Meteorological Agency) for your specific location; use the 'Tsunami Evacuation Route' signposts in coastal towns
  2. 85% success If no map is available, evacuate vertically (go to the highest floor of a reinforced concrete building at least 3 stories tall) or horizontally to a hill at least 30 meters above sea level; do not stop at 10m 
    If no map is available, evacuate vertically (go to the highest floor of a reinforced concrete building at least 3 stories tall) or horizontally to a hill at least 30 meters above sea level; do not stop at 10m

中文步骤

  1. Check local tsunami evacuation maps from official sources (e.g., USGS, NOAA, Japan Meteorological Agency) for your specific location; use the 'Tsunami Evacuation Route' signposts in coastal towns
  2. If no map is available, evacuate vertically (go to the highest floor of a reinforced concrete building at least 3 stories tall) or horizontally to a hill at least 30 meters above sea level; do not stop at 10m

Dead Ends

Common approaches that don't work:

  1. 85% fail

    User assumes all tsunamis are the same size; Okushiri 1993 had 31m run-up, 2004 Indian Ocean had 50m in places

  2. 70% fail

    User relies on outdated paper maps that don't show current tsunami hazard zones; many coastal areas update maps annually