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Fact Check: Eruption's ash cloud visible from cities 90 miles away!

Fact Check: Eruption's ash cloud visible from cities 90 miles away!

Published June 17, 2025
ByFactChecker 1.1 avatarFactChecker 1.1
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VERDICT
Partially True

# Fact Check: Eruption's Ash Cloud Visible from Cities 90 Miles Away! ## What We Know The claim that an eruption's ash cloud can be visible from citi...

Fact Check: Eruption's Ash Cloud Visible from Cities 90 Miles Away!

What We Know

The claim that an eruption's ash cloud can be visible from cities 90 miles away has some basis in reality, particularly when examining recent volcanic activity. For instance, the eruption of Mount Lewotobi in Indonesia produced a massive ash cloud that was indeed visible from cities located up to 90 miles away, as reported by multiple sources (source-3, source-4, source-5).

Additionally, in the context of Mount Spurr in Alaska, experts have indicated that an eruption could generate significant ash clouds that may affect areas as far as 80 miles away, particularly if the wind conditions are favorable (source-1). This suggests that while the claim is not universally applicable to all eruptions, it holds true under certain conditions and for specific volcanic events.

Analysis

The evidence supporting the claim is derived from recent volcanic eruptions that have demonstrated the capacity for ash clouds to travel considerable distances. The eruption of Mount Lewotobi, for example, produced an ash cloud that reached heights of 10,000 meters (approximately 32,800 feet) and was visible from cities up to 90 miles away (source-4). This event exemplifies the potential for volcanic ash clouds to impact areas far removed from the eruption site.

Conversely, the situation with Mount Spurr in Alaska illustrates that while ash clouds can affect nearby urban areas, the specific distance of 90 miles is not guaranteed. The U.S. Geological Survey has noted that an eruption could impact Anchorage, which is about 80 miles away, but the actual visibility and impact would depend on various factors, including wind direction and the volume of ash produced (source-1).

In evaluating the reliability of these sources, National Geographic and NPR are reputable outlets known for their scientific reporting, while the reports on Mount Lewotobi come from credible news organizations that cover global events. However, the variability in volcanic activity means that while the claim is plausible, it cannot be universally applied to all volcanic eruptions.

Conclusion

The claim that an eruption's ash cloud can be visible from cities 90 miles away is Partially True. While specific eruptions, such as that of Mount Lewotobi, have demonstrated this capability, the situation is not universally applicable to all volcanic eruptions. Factors such as the volcano's activity, ash cloud height, and prevailing wind conditions play critical roles in determining the actual distance ash clouds can travel and be visible from urban areas.

Sources

  1. This Alaska volcano might erupt soon. Here's the chaos it could cause ... (https://www.nationalgeographic.com/science/article/alaska-volcano-mount-spurr-eruption-ash)
  2. Mount Etna erupts, shooting a massive ash cloud into the sky and ... - NPR (https://www.npr.org/2025/06/02/g-s1-70041/mount-etna-erupts-volcano-italy-sicily)
  3. Watch: volcano in huge eruption, fiery ash cloud explodes (https://www.newsweek.com/watch-volcano-huge-eruption-fiery-ash-cloud-explodes-33000-feet-high-2086578)
  4. Volcano erupts in Indonesia, unleashing 6.8 miles-high ash cloud (https://news.sky.com/story/volcano-erupts-in-indonesia-unleashing-68-miles-high-ash-cloud-13384955)
  5. Volcano erupts in Indonesia, unleashing 6.8 miles-high ... (https://news.sky.com/story/volcano-erupts-in-indonesia-unleashing-6-8-miles-high-ash-cloud-13384955)
  6. Volcano erupts in Indonesia, spews hot ash 10,000m into sky. Watch - WION (https://www.wionews.com/world/volcano-erupts-in-indonesia-spews-hot-ash-10000m-into-sky-watch-1750177125589)
  7. Massive volcanic eruption in Indonesia sends ash cloud miles into ... - MSN (https://www.msn.com/en-gb/news/world/massive-volcanic-eruption-in-indonesia-sends-ash-cloud-miles-into-the-sky/ss-AA1GT3hO)

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