TSUNAMI-EVAC-HEIGHT-ERR 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 the roof of a 3-story building

ID: safety/tsunami-evacuation-height-error

Also available as: JSON · Markdown · 中文
78%Fix Rate
87%Confidence
1Evidence
2024-03-15First Seen

Version Compatibility

VersionStatusIntroducedDeprecatedNotes
tsunami.gov v2.3 active — — —
NOAA Tsunami Warning System 2024 active — — —
USGS ShakeAlert v1.2 active — — —

Root Cause

Tsunami runup heights can exceed 30 meters (e.g., 2011 Tohoku tsunami reached 40.5m), and buildings under 5 stories or below 20m elevation are often destroyed; vertical evacuation requires structures engineered for tsunami forces, not just height.

generic

中文

海啸爬高可达30米以上（如2011年东日本海啸达到40.5米），低于5层或海拔20米以下的建筑物常被摧毁；垂直疏散需要经过海啸工程设计的结构，而不仅仅是高度。

Official Documentation

https://www.tsunami.gov/evacuation-guide

Workarounds

  1. 88% success Evacuate horizontally inland to at least 30m elevation or 3km from coast; if no time, use designated tsunami vertical evacuation structure (TVES) marked with signage. 
    Evacuate horizontally inland to at least 30m elevation or 3km from coast; if no time, use designated tsunami vertical evacuation structure (TVES) marked with signage.
  2. 82% success Check local tsunami evacuation maps (e.g., NOAA TsunamiZone.org) and identify reinforced concrete buildings over 5 stories built after 2000 with deep foundations. 
    Check local tsunami evacuation maps (e.g., NOAA TsunamiZone.org) and identify reinforced concrete buildings over 5 stories built after 2000 with deep foundations.
  3. 75% success If trapped in a building, go to floor 6+ of a reinforced concrete structure away from ocean-facing windows; bring emergency kit and prepare for multiple waves. 
    If trapped in a building, go to floor 6+ of a reinforced concrete structure away from ocean-facing windows; bring emergency kit and prepare for multiple waves.

中文步骤

  1. 水平疏散至海拔至少30米或距海岸3公里处；若时间不足，使用标有标识的指定海啸垂直疏散结构（TVES）。
  2. 查阅当地海啸疏散地图（如NOAA TsunamiZone.org），识别2000年后建造的5层以上钢筋混凝土建筑。
  3. 若被困建筑物内，前往钢筋混凝土结构6层及以上，远离面向海洋的窗户；携带应急包，准备应对多次海浪。

Dead Ends

Common approaches that don't work:

  1. 65% fail

    Buildings may collapse under hydrodynamic forces or be scoured from foundation; height alone insufficient.

  2. 72% fail

    Roofs are not designed for lateral wave loads; debris impact can destroy structure.

  3. 58% fail

    Many buildings in tsunami zones are wood-frame and will be swept away regardless of height.