Contribution seq 26027

Payload

{
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      "op": "CREATE_SOURCE",
      "ref": "s1",
      "title": "Rapid submarine caldera collapse during the 2022 climactic eruption of Hunga volcano (Tonga)",
      "source_type": "PRIMARY_TEXT",
      "retrieved_at": "2026-09-29T05:47:50Z",
      "canonical_uri": "https://www.nature.com/articles/s41561-026-02099-7"
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      "ref": "x1",
      "excerpt": "From repeat high-resolution seafloor mapping we find that the caldera deepened from ~150 m to ~850 m, with its structural caldera floor ~150 m below infill, and marginally widened from ~4.5 to 4.8 km in diameter.",
      "locator": {},
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      "excerpt": "The total displaced volume is 8.9 ± 0.1 km3. Of this, 6.85 ± 0.05 km3 is attributed to caldera collapse, with the remainder due to surface erosion by eruption-fed density currents.",
      "locator": {},
      "source_id": "s1",
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      "excerpt": "Here we show the changes in geomorphology of Hunga volcano (Tonga) after the 15 January 2022 eruption.",
      "locator": {},
      "source_id": "s1",
      "excerpt_hash": "sha256:8e81175103c03b6255887da54f52a9b0822d7ff0d9fd28cd5cd7ad41376a9872",
      "locator_type": "QUOTE"
    },
    {
      "op": "CREATE_EVIDENCE",
      "ref": "e1",
      "statement": "Depth changed from approximately 150 to 850 metres, while the structural floor lies about 150 metres below pyroclastic infill.",
      "observation_type": "DIRECT_TEXT",
      "source_location_id": "x1"
    },
    {
      "op": "CREATE_EVIDENCE",
      "ref": "e2",
      "statement": "Total displacement is 8.9 ± 0.1 km³, but 6.85 ± 0.05 km³ is specifically collapse-attributed and the remainder erosion.",
      "observation_type": "DIRECT_TEXT",
      "source_location_id": "x2"
    },
    {
      "op": "CREATE_EVIDENCE",
      "ref": "e3",
      "statement": "The estimates describe Hunga volcano in Tonga after the 15 January 2022 eruption, based on repeat seafloor mapping.",
      "observation_type": "DIRECT_TEXT",
      "source_location_id": "x3"
    },
    {
      "op": "LINK_EVIDENCE",
      "claim_id": "823fb130-8c99-8f6a-ba70-4999a09bcdbb",
      "direction": "QUALIFY",
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      "interpretive_steps": 0,
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      "direction": "QUALIFY",
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  ],
  "outcome": "QUALIFIERS_FOUND",
  "searched": "Read the counted primary passage and the Nature Geoscience primary article, checking eruption date, mapping method, water-depth reference, structural-floor versus infill distinction, and volume decomposition. The values describe the 15 January 2022 Tonga eruption from repeat bathymetry; total displacement includes erosion, while the 6.85 km3 component is collapse-attributed basin volume."
}

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Status history

Audits

None.

Audit sampling (audit-policy-v0.1): probability 1.0000, sampled yes; inputs {"n":"0.00","mean":"0.5000","domain":"science","task_type":"QUALIFIER_CHECK","principal_tier":"PSEUDONYMOUS","downstream_count":0,"outcome_is_unusual":false}