{
  "id": "safety/tsunami-evacuation-height-myth",
  "signature": "AI tells a coastal resident during a tsunami warning to evacuate to a building at least 10 meters above sea level, or to a designated shelter 100 meters inland",
  "signature_zh": "AI告诉沿海居民在海啸警报期间撤离到海拔至少10米的建筑物或距离海岸100米内的指定避难所",
  "regex": "10 meters.*tsunami|100 meters.*inland|evacuate.*higher ground.*tsunami",
  "domain": "safety",
  "category": "runtime_error",
  "subcategory": null,
  "root_cause": "Tsunami runup can exceed 30 meters in some regions (e.g., 2011 Tohoku runup reached 40 meters), and 100 meters inland is insufficient in low-lying areas; safe zones are defined by local tsunami inundation maps, not universal numbers.",
  "root_cause_type": "generic",
  "root_cause_zh": "某些地区的海啸爬高可超过30米（例如2011年东日本大地震海啸爬高达到40米），而在低洼地区仅向内陆撤离100米是不够的；安全区域由当地海啸淹没地图定义，而非通用数字。",
  "versions": [
    {
      "version": "NOAA TsunamiReady Guidelines 2023",
      "introduced": null,
      "deprecated": null,
      "removed": null,
      "behavior_change": null,
      "status": "active"
    },
    {
      "version": "USGS Tsunami Inundation Maps 2024",
      "introduced": null,
      "deprecated": null,
      "removed": null,
      "behavior_change": null,
      "status": "active"
    },
    {
      "version": "Pacific Tsunami Warning Center SOP 2023",
      "introduced": null,
      "deprecated": null,
      "removed": null,
      "behavior_change": null,
      "status": "active"
    }
  ],
  "os_specific": {},
  "dead_ends": [
    {
      "action": "Telling user that 10 meters elevation is universally safe for all tsunamis",
      "why_fails": "Some tsunamis can overtop 30-meter cliffs; local topography and historical runup data must be consulted",
      "fail_rate": 0.85,
      "condition": "",
      "sources": []
    },
    {
      "action": "Advising to go to the nearest building that is at least two stories tall",
      "why_fails": "A two-story building (approx 6-7 meters) may not be high enough in a major tsunami; vertical evacuation structures are specifically engineered for tsunami loads",
      "fail_rate": 0.7,
      "condition": "",
      "sources": []
    },
    {
      "action": "Claiming that being 100 meters inland is sufficient regardless of elevation",
      "why_fails": "In flat coastal areas, tsunami waves can travel kilometers inland; 100 meters is negligible",
      "fail_rate": 0.9,
      "condition": "",
      "sources": []
    }
  ],
  "workarounds": [
    {
      "action": "Check local tsunami evacuation maps (e.g., https://www.tsunami.gov/ or local emergency management website). Know your zone: in many areas, evacuate on foot to at least 30 meters elevation or 3 km inland, or to a designated vertical evacuation structure. Do not use roads that may be congested or blocked.",
      "success_rate": 0.9,
      "how": "Check local tsunami evacuation maps (e.g., https://www.tsunami.gov/ or local emergency management website). Know your zone: in many areas, evacuate on foot to at least 30 meters elevation or 3 km inland, or to a designated vertical evacuation structure. Do not use roads that may be congested or blocked.",
      "condition": "",
      "sources": []
    },
    {
      "action": "If near a coast with no map, go to the highest natural point (hill or mountain) within 15 minutes walking distance. In flat areas, go inland at least 3 km. Follow official warnings: if you feel strong shaking or see water receding, move immediately without waiting for official alert.",
      "success_rate": 0.85,
      "how": "If near a coast with no map, go to the highest natural point (hill or mountain) within 15 minutes walking distance. In flat areas, go inland at least 3 km. Follow official warnings: if you feel strong shaking or see water receding, move immediately without waiting for official alert.",
      "condition": "",
      "sources": []
    }
  ],
  "workarounds_zh": [
    "Check local tsunami evacuation maps (e.g., https://www.tsunami.gov/ or local emergency management website). Know your zone: in many areas, evacuate on foot to at least 30 meters elevation or 3 km inland, or to a designated vertical evacuation structure. Do not use roads that may be congested or blocked.",
    "If near a coast with no map, go to the highest natural point (hill or mountain) within 15 minutes walking distance. In flat areas, go inland at least 3 km. Follow official warnings: if you feel strong shaking or see water receding, move immediately without waiting for official alert."
  ],
  "transition_graph": {
    "leads_to": [],
    "preceded_by": [],
    "frequently_confused_with": []
  },
  "official_doc_url": "https://www.weather.gov/tsunami/evacuation",
  "official_doc_section": null,
  "error_code": "TSUNAMI-EVAC-003",
  "verification_tier": "ai_generated",
  "confidence": 0.88,
  "fix_success_rate": 0.8,
  "resolvable": "true",
  "first_seen": "2024-09-10",
  "last_confirmed": "2024-06-01",
  "last_updated": "2024-06-01",
  "evidence_count": 1,
  "tags": [],
  "locale": "en",
  "aliases": []
}