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    "story_id": "mp-2026-07-19-009",
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    "headline": "The Plate Under the Mega-Eruption Was Rebuilt From Within",
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    "dek": "Seismic waves reveal horizontal layers cut by vertical dike swarms beneath the Ontong Java Plateau.",
    "summary": "Seismic waves reveal horizontal layers cut by vertical dike swarms beneath the Ontong Java Plateau.",
    "body_text": "Researchers used Po and So seismic waves recorded by ocean-bottom and island instruments to model the structure under the world's largest oceanic plateau. Efficient Po transmission and weakened So waves fit a composite plate crossed by broad vertical magma intrusions, while unusually slow velocities suggest chemical alteration as magma rose. The analysis reconstructs a 110- to 120-million-year-old event from present-day wave behavior; it does not directly observe the ancient flow.",
    "why_it_matters": "Seismic waves reveal horizontal layers cut by vertical dike swarms beneath the Ontong Java Plateau.",
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      "The analysis reconstructs a 110- to 120-million-year-old event from present-day wave behavior; it does not directly observe the ancient flow."
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    "tags": [
      "volcanism",
      "seismology",
      "oceanic plates"
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  "sources": [
    {
      "source_id": "source-2026-07-19-009",
      "title": "Okayama University of Science via ScienceDaily: Ontong Java Plateau",
      "publisher": "Okayama University of Science via ScienceDaily",
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  "cite_this_report": {
    "title": "The Plate Under the Mega-Eruption Was Rebuilt From Within",
    "publisher": "The Machine Press",
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