{
  "id": 9334318,
  "title": "Small undersea volcanoes may unleash outsized tsunamis",
  "url": "https://urgent.news/2026/09/23/small-undersea-volcanoes-may-unleash-outsized-tsunamis",
  "topic": "world",
  "section": "World",
  "published": "2026-09-23T11:15:30.000Z",
  "source": {
    "name": "Ars Technica",
    "slug": "ars-technica",
    "url": "https://arstechnica.com/science/2026/09/small-undersea-volcanoes-may-unleash-outsized-tsunamis/"
  },
  "original_language": "en",
  "account": "The 1883 eruption of Krakatau in Indonesia claimed over 30,000 lives, primarily due to a tsunami generated by the volcanic blast. While land-based volcanoes pose familiar hazards, underwater eruptions can present quite different dangers depending on how the activity interacts with seawater. In deep ocean waters, high water pressure can temper explosive volcanic eruptions, reducing their destructive potential. However, nearer the surface, lower water pressure and hotter volcanic materials can trigger violent explosions. Scientists, however, remain uncertain about the precise conditions that trigger tsunamis from underwater volcanic activity. To shed light on this issue, an international research team examined the 2022 Hunga eruption in Tonga, concentrating on the rapid caldera collapse that likely intensified the eruption's tsunami. Calderas are formed when the land above a magma chamber collapses as the molten rock drains away. By comparing pre- and post-eruption seafloor topography, researchers noted that a roughly four-kilometer-wide caldera sank by about a kilometer during the Hunga eruption.",
  "summary": "Post-eruption imaging of the Hunga caldera gives new details of its collapse.",
  "key_points": [],
  "editors_take": null,
  "illustration": null,
  "coverage": {
    "outlets": 2,
    "also_reported_by": [
      {
        "outlet": "Ars Technica Science",
        "title": "Small undersea volcanoes may unleash outsized tsunamis",
        "url": "https://urgent.news/2026/09/23/small-undersea-volcanoes-may-unleash-outsized-tsunamis-9338447",
        "published": "2026-09-23T11:15:30.000Z"
      }
    ]
  },
  "ai_generated": true,
  "disclaimer": "Summaries, key points and the editor’s take are written by software from other outlets’ reporting and may contain errors — always check the linked original."
}