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Catastrofi · Vanuatu earthquake

Magnitude 6.0 quake strikes off Vanuatu; local impact still unconfirmed

Early models point to low impact from the shallow offshore quake, with an estimated 2,000 people in a light-shaking zone. Conditions ashore remain unverified.

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HeyDex

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The earthquake began ten kilometres beneath the seabed, 165 kilometres northwest of Port-Olry. It was 10:47 p.m. in Vanuatu on Sunday, November 1, when the magnitude 6.0 event struck offshore—not in the town used to describe its location.⁠1⁠13

The early impact estimates were reassuring: a green USGS PAGER alert and a low potential humanitarian impact assessment from the Global Disaster Alert and Coordination System, or GDACS. But neither amounts to an inspection of a damaged building, a check on a remote community or a confirmed casualty count. What happened ashore remains the central unanswered question.⁠1⁠2

6.0Reviewed earthquake magnitude 1
10 kmReported depth 1
2,000People in GDACS’s modeled light-shaking zone 2

The USGS gives the earthquake’s origin time as 11:47:03 UTC on November 1, 2026. GDACS records it to the nearest minute as 11:47 UTC, or 22:47 local time, and entered its report about 15 minutes later. Those times describe the same event, not conflicting accounts. Port-Olry is on Espiritu Santo, Vanuatu’s largest island; the distance from it locates the offshore epicentre rather than identifying a place where damage has been confirmed.⁠1⁠13⁠4

What the green assessment actually means

GDACS estimates that 2,000 people were within a zone of Modified Mercalli intensity IV, meaning light shaking. That figure is an exposure estimate: people potentially within a modeled shaking area. It is not a count of people injured, displaced or left homeless. GDACS bases its low humanitarian-impact projection on the earthquake’s magnitude, the affected population and that population’s vulnerability.⁠13⁠3

The distinction between magnitude and intensity matters here. Magnitude describes the earthquake itself; intensity describes shaking at a particular location. Communities on different islands can therefore experience the same earthquake differently. A magnitude 6.0 headline does not mean that every island—or every resident—experienced the same force.⁠17⁠24

The exposure estimates are not identical across the available pages. GDACS’s November 1 report gives 2,000 people at intensity IV; QuakeScout’s event page, checked the same day, displays 3,700 people at that level under its USGS PAGER exposure section. The available records do not reconcile those figures or establish that one supersedes the other. Both are modeled exposure counts, not observed casualties.⁠13⁠3

PAGER, the USGS system for rapidly estimating earthquake impacts, calculates population exposure and likely ranges of fatalities and economic losses. Green means a low likelihood of casualties and damage—not proof that nobody was hurt. USGS says the estimates change as additional sensor data and reported shaking intensities become available, and that uncertainty is greatest in the minutes and hours after an earthquake.⁠3⁠17

Tsunami status is a separate question

PAGER’s loss estimates exclude secondary effects such as landslides, liquefaction and tsunami. A green earthquake-impact alert consequently cannot double as a tsunami assessment. The USGS event record carries no tsunami flag, but that field alone is not an official coastal all-clear.⁠17⁠1

Lusa-based reports published by Executive Digest and Notícias ao Minuto on November 1 said no tsunami alerts had been issued and no casualties or material damage had been recorded. They did not supply an event-specific Pacific Tsunami Warning Center or Vanuatu Meteorology and Geo-Hazards Department bulletin, nor attributable local damage surveys or medical accounts. Their reporting supports “none reported at publication,” not a final zero toll or a verified official no-threat bulletin.⁠5⁠4

The general U.S. tsunami-warning website displayed no warning, advisory, watch or threat in effect when checked, but its earthquake and alert layers failed to load. That display does not establish the contents of a Vanuatu-specific notice. There is no verified event-specific bulletin here on which to assert either a tsunami threat or an official all-clear.⁠6

Vanuatu’s recent earthquakes show why each event needs its own assessment. A week earlier, offshore earthquakes of magnitude 6.9 and 6.3 prompted a tsunami alert concerning potentially dangerous waves along coasts within 300 kilometres of their epicentre. In December 2024, a magnitude 7.4 earthquake killed more than a dozen people, injured about 200 and badly damaged Port Vila. Neither episode establishes the consequences of this smaller, offshore event.⁠4

For this earthquake, no confirmed death, injury or material-damage figures are available. QuakeScout also displayed no published firsthand felt reports, an absence that cannot establish that nobody felt it. The initial picture remains one of low expected impact, awaiting the local evidence needed to say what communities actually experienced.⁠4⁠3

Fonti15

Tra le fonti citate, earthquaketracker.org ha pubblicato per prima, 12 ore prima della diffusione di questo servizio. Hanno seguito 6 altre testate.
  1. earthquaketracker.org
  2. Faultline
  3. USGS
  4. GDACS
  5. infobae
  6. Executive Digest
  7. Notícias ao Minuto
  8. HeyDay News

1 articolo precedente consultato per approfondire.7 testate senza data:Cedar Newsioc-unesco.orgmsu.ruQuakeScouttsunami.govvmgd.gov.vu

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Come trasmesso
  1. A magnitude six earthquake struck offshore northwest of Vanuatu. Models place an estimated 2,000 people in an area of light shaking. Whether communities suffered injuries, damaged buildings or disrupted services still needs a local assessment.
  2. The reviewed magnitude is six point zero, and the earthquake began ten kilometres beneath the seabed. It struck late Sunday, November first, at about ten forty-seven at night local time.
  3. The epicenter was 165 kilometres northwest of Port-Olry, out at sea. Port-Olry sits on Espiritu Santo, Vanuatu's largest island. The distance describes the offshore earthquake's position relative to the town.
  4. People on different islands can experience different shaking from the same earthquake. Magnitude measures the earthquake itself. Intensity describes the shaking at a particular location, which can vary from one community to another.
  5. An estimated 2,000 people were within the modeled zone of intensity four, meaning light shaking. The humanitarian impact projection is low, and the PAGER impact alert is green, indicating a low likelihood of casualties and damage.
  6. That exposure figure counts people potentially within a shaking zone. It doesn't count injuries or people forced from their homes. The humanitarian projection weighs the earthquake's magnitude, the affected population and how vulnerable that population is.
  7. PAGER estimates how many people experienced different levels of shaking, then estimates likely fatalities and economic losses. It updates those calculations as more information arrives. Uncertainty is greatest in the early minutes and hours.
  8. The first humanitarian assessment appeared about fifteen minutes after the earthquake. Its origin time was rounded to the nearest minute, consistent with the more precise earthquake timing.
  9. PAGER's loss estimates leave out secondary effects, including landslides, liquefaction and tsunami. A green impact alert therefore can't settle the separate question of tsunami risk.
  10. The earthquake listing carries no tsunami flag. No tsunami alert has been reported for this event, but an event-specific official coastal all-clear still needs confirmation.
  11. Vanuatu has more than eighty islands and lies along the Pacific Ring of Fire, a zone of frequent earthquake and volcanic activity. Its recent earthquakes have had very different consequences.
  12. A magnitude 7.4 earthquake in December 2024 killed more than a dozen people and injured about 200, badly damaging Port Vila. A week before this latest quake, offshore earthquakes of magnitude 6.9 and 6.3 prompted a tsunami alert.
  13. That earlier alert concerned potentially dangerous waves along coasts within 300 kilometres of those earthquakes' epicenter.
  14. For this magnitude six earthquake, the early models point to limited impact. Local assessments still need to determine whether buildings or services were affected. No confirmed death, injury or material-damage figures are available.

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