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Anak Krakatau volcano erupts, spewing ash and causing booms

Indonesian authorities issue alert level III and prohibit access within a 3km radius of the volcano.

AI-assisted coverage comparison, editor-supervised · How this was made

Published
El Krakatoa en erupción, en una imagen de archivoGetty / Oystein lund andersen

What this story says

  • The Anak Krakatau volcano erupted on September 4-5, 2026, producing an explosive event observed by satellite.
  • An ash column reached approximately 14km to 15km high, though one report stated 400m.
  • Loud booms were heard up to 150km away, and Indonesian authorities issued an Alert Level III, banning access within a 3km radius.
  • Reports vary on the number of eruptions, with some stating one, others six, and one citing at least ten.

Who covered it

Left 20%(2)Centre 20%(2)Right 60%(6)

Percentages are shares of the 10 outlets carrying a published leaning rating. 22 of the 32 outlets we know ran this story carry no rating and are not counted in them. Coverage measured .

Trust

74/100

Craft

46/100

Hype

15/100

32 sources · methodology

The Anak Krakatau volcano erupted explosively on September 4-5, 2026. The event was observed by the Himawari-9 satellite and generated an ash column. Indonesian authorities placed the volcano under Alert Level III and prohibited access within a 3-kilometre radius.

Disagreement on eruption height and number

Reports differ on the height of the ash column produced by the eruption. La Vanguardia and The Watchers reported it at about 14km and 15km respectively, while NHK World stated 400m. The number of eruptions also varies, with La Vanguardia mentioning a single strong eruption, tempo reporting six, and liputan6 citing at least ten.

What the coverage left out

None of the left-rated digests mention the report by the Geological Agency stating there is no potential for a collapse large enough to trigger a tsunami, which was included in a right-rated digest.

Still developing. We have re-checked which outlets are covering this 1 time, most recently on 5 Sept 2026, 10:00, and will add the sides that appear.

How each side covered it

Our own reading of the reporting listed below, written from the outlets’ articles rather than quoted from them. The reasoning is set out on our methodology page.

Left

2 rated outlets

  • Both left-rated reports highlighted the explosive nature of the eruption and the resulting ash column. La Vanguardia reported the ash column reached about 14km and that the noise could be heard up to 150km away. It also noted the alert level and a 5km exclusion zone, though other reports mention 3km. Tempo reported six eruptions and lava fountains.

Centre

2 rated outlets

  • Centre-rated reports focused on the eruption event and the alert status. El Periódico mentioned the volcano's history of causing a tsunami in 2018 and noted the alert level and a 3km radius prohibition. Bne IntelliNews stated the eruption spanned from late Friday into early Saturday.

Right

6 rated outlets

  • Right-rated reports led on the eruption and its immediate effects, with several mentioning the sounds heard and the ash. Anadolu Ajansı stated there was no potential for a tsunami-triggering collapse. Free Malaysia Today News reported booming and rumbling sounds and lava-fountaining activity. NHK World and Thairath reported Japan checking for tsunami threats. Liputan6 cited at least ten eruptions, and Tribunnews noted that windows vibrated in Bandung due to loud bangs.

Questions about this coverage

How did the left and right cover Anak Krakatau volcano erupts, spewing ash and causing booms?
Of the 10 outlets on this story carrying a published leaning rating, 20% are rated left, 20% are rated centre, 60% are rated right. Those percentages are shares of the rated outlets, not of every outlet that ran it, which was 32. The sections above set out what each side emphasised, in its own terms.
Is Anak Krakatau volcano erupts, spewing ash and causing booms left or right?
Too few of the outlets on this story carry a published leaning rating to say. 10 of them do, and this site does not characterise a field under 12: at that size one newsroom filing moves the share by ten points. The percentages above are the count as it stands.
Is the coverage of Anak Krakatau volcano erupts, spewing ash and causing booms biased?
Anak Krakatau volcano erupts, spewing ash and causing booms is one event reported by 32 outlets, and this page does not rate the story as biased or unbiased. What it publishes is the spread: which outlets ran it, where named rating organisations place each of them on the spectrum, and what each side chose to lead with. A leaning rating describes an outlet's record over time, not this article, and the two should not be run together.
Which outlets covered Anak Krakatau volcano erupts, spewing ash and causing booms?
32 that we know of, every one of them listed further up this page with a link to its own report and to what we hold on the publisher. Nothing here is a summary of somebody else's summary: the outlets are named so the original reporting can be read.
When did the Anak Krakatau volcano erupt?
The Anak Krakatau volcano erupted explosively on September 4-5, 2026. The event was observed by the Himawari-9 satellite and generated an ash column.
How high was the ash column from the eruption?
Reports differ on the height of the ash column. La Vanguardia and The Watchers reported it at about 14km and 15km respectively, while NHK World stated 400m.
What measures did Indonesian authorities take?
Indonesian authorities placed the volcano under Alert Level III and prohibited access within a 3-kilometre radius around the crater. They also urged residents and tourists to stay away.
Were there any reports of tsunamis?
While some reports mentioned Japan checking for tsunami threats, the Geological Agency stated there was no potential for a collapse large enough to trigger a tsunami. No actual tsunami was reported.

Read it at the source

32 outlets, grouped by the leaning a published rating gives them. Every headline links to the original; an underlined outlet name opens our profile of that publisher.

Left

2

Centre

2

Right

6

Not rated

22
Show 14 more

How did this read?

About the coverage, not about the story. We do not ask whether you agree with what happened — we have no honest use for that answer.

Anak Krakatau Volcano Erupts | MediaBias News