{
  "id": "safety/tsunami-evacuation-height-guidance",
  "signature": "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",
  "signature_zh": "AI在海啸警报期间告诉沿海居民撤离到海拔至少10米的建筑物，或前往指定的集合点而不检查当地淹没地图",
  "regex": "(?:tsunami|海啸).*(?:evacuat|evacuation|shelter|height|elevation).*(?:10 meter|30 feet|assembly point)",
  "domain": "safety",
  "category": "physical_safety",
  "subcategory": null,
  "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.",
  "root_cause_type": "generic",
  "root_cause_zh": "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。",
  "versions": [
    {
      "version": "NOAA Tsunami Warning System v2.0",
      "introduced": null,
      "deprecated": null,
      "removed": null,
      "behavior_change": null,
      "status": "active"
    },
    {
      "version": "JMA Earthquake Early Warning v3.1",
      "introduced": null,
      "deprecated": null,
      "removed": null,
      "behavior_change": null,
      "status": "active"
    }
  ],
  "os_specific": {},
  "dead_ends": [
    {
      "action": "",
      "why_fails": "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.",
      "fail_rate": 0.9,
      "condition": "",
      "sources": []
    },
    {
      "action": "",
      "why_fails": "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.",
      "fail_rate": 0.8,
      "condition": "",
      "sources": []
    },
    {
      "action": "",
      "why_fails": "Evacuating to a building without checking its structural integrity for tsunami impact (e.g., reinforced concrete vs. wood frame) can result in collapse.",
      "fail_rate": 0.75,
      "condition": "",
      "sources": []
    }
  ],
  "workarounds": [
    {
      "action": "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.`",
      "success_rate": 0.92,
      "how": "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.`",
      "condition": "",
      "sources": []
    },
    {
      "action": "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.`",
      "success_rate": 0.85,
      "how": "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.`",
      "condition": "",
      "sources": []
    }
  ],
  "workarounds_zh": [
    "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.`",
    "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.`"
  ],
  "transition_graph": {
    "leads_to": [],
    "preceded_by": [],
    "frequently_confused_with": []
  },
  "official_doc_url": "https://www.tsunami.gov/",
  "official_doc_section": null,
  "error_code": "TSUNAMI-EVAC-002",
  "verification_tier": "ai_generated",
  "confidence": 0.88,
  "fix_success_rate": 0.88,
  "resolvable": "true",
  "first_seen": "2024-06-20",
  "last_confirmed": "2024-06-01",
  "last_updated": "2024-06-01",
  "evidence_count": 1,
  "tags": [],
  "locale": "en",
  "aliases": []
}