safety physical_safety ai_generated partial

AI tells a coastal resident during a tsunami warning to evacuate to a building at least 10 meters above sea level, or to evacuate horizontally to a designated shelter 1 km inland

ID: safety/tsunami-evacuation-building-height

Also available as: JSON · Markdown · 中文
82%Fix Rate
88%Confidence
1Evidence
2024-11-15First Seen

Version Compatibility

VersionStatusIntroducedDeprecatedNotes
NOAA Tsunami Warning System v3.2 active — — —
USGS ShakeAlert v2.0 active — — —
JMA Earthquake Early Warning v2.1 active — — —

Root Cause

Tsunami evacuation height and distance are site-specific based on local topography, historical runup data, and inundation modeling; a generic 10-meter or 1-km rule is insufficient for areas with potential for 30-meter+ waves or where inland flooding may exceed 1 km, leading to false safety assurances.

generic

中文

海啸疏散高度和距离基于当地地形、历史爬高数据和淹没模型而定；通用的10米或1公里规则不足以应对可能产生30米以上波浪或内陆洪水超过1公里的区域，导致虚假的安全保证。

Official Documentation

https://www.tsunami.gov/

Workarounds

  1. 85% success Use local tsunami inundation maps (e.g., from USGS, NOAA, or local emergency management) to determine minimum evacuation elevation and distance for your specific location. For example, in Crescent City, CA, minimum elevation is 30 feet (9.1 m) but recommended is 50 feet (15.2 m) due to wave runup. 
    Use local tsunami inundation maps (e.g., from USGS, NOAA, or local emergency management) to determine minimum evacuation elevation and distance for your specific location. For example, in Crescent City, CA, minimum elevation is 30 feet (9.1 m) but recommended is 50 feet (15.2 m) due to wave runup.
  2. 80% success Implement the 'vertical evacuation' strategy: identify a reinforced concrete building at least 3 stories tall within walking distance, and evacuate to the third floor or higher. This is recommended by FEMA for communities without high ground. 
    Implement the 'vertical evacuation' strategy: identify a reinforced concrete building at least 3 stories tall within walking distance, and evacuate to the third floor or higher. This is recommended by FEMA for communities without high ground.
  3. 90% success Check real-time tsunami warning bulletins from authoritative sources (e.g., NOAA Tsunami.gov, JMA, Pacific Tsunami Warning Center) which provide estimated arrival times and wave heights; adjust evacuation based on current threat level. 
    Check real-time tsunami warning bulletins from authoritative sources (e.g., NOAA Tsunami.gov, JMA, Pacific Tsunami Warning Center) which provide estimated arrival times and wave heights; adjust evacuation based on current threat level.

中文步骤

  1. 使用当地海啸淹没地图（例如来自USGS、NOAA或当地应急管理部门）确定您所在位置的最低疏散海拔和距离。例如，在加州克雷森特城，最低海拔为30英尺（9.1米），但由于波浪爬高，建议海拔为50英尺（15.2米）。
  2. 实施'垂直疏散'策略：在步行距离内确定一栋至少3层的钢筋混凝土建筑，并疏散到第三层或更高。FEMA建议在没有高地的社区采用此方法。
  3. 查看权威来源（例如NOAA Tsunami.gov、JMA、太平洋海啸预警中心）的实时海啸预警公告，这些公告提供预计到达时间和波高；根据当前威胁级别调整疏散。

Dead Ends

Common approaches that don't work:

  1. 65% fail

    Building collapse or displacement by debris can occur even at height if structure is weak.

  2. 55% fail

    Inundation maps show variable distances; 1 km is a minimum, not a safe distance.

  3. 70% fail

    Ground-level shelters may be flooded; vertical evacuation to upper floors is often safer.