Krakatoa Update (May 20, 2022, 1929 UTC)


Okay, it’s called Anak Krakatau — Child of Krakatoa — now, but I suspect it is still “Krakatoa” to most folks outside Indonesia who don’t happen to be volcanophiles.

Update on name: Per the Royal Society’s 19th-century report on the 1883 eruption, this volcano’s name is related to a local word for “crab,” which it did resemble.


Chris DHDR via Wikimedia, public domain.


May 20, 2022, 12:17 p.m., Pacific: Darwin VAAC issued the last advisory today.

Since clouds obscure the volcano, I’ll keep this pinned for a little while longer, but, hopefully, this episode has ended. 🤞

12:29 p.m.: So I get on Twitter after posting that update and find this. That “crab” out in the Sunda Strait still needs watching!


https://platform.twitter.com/widgets.js


May 17, 2022, 9:39 a.m., Pacific: There’s no change apparently. Darwin VAAC issued another advisory. Their remarks:

: VA NOT IDENTIFIABLE ON SATELLITE IMAGERY DUE TO MET
CLOUD IN AREA. WEAK VA PLUME LAST OBS 17/0930Z EXTENDING N
OF VOLCANO. WEBCAM SHOWS STEAM EMISSION ONGOING. VA HEIGHT
AND FCST MOV BASED ON HIMAWARI-8 IMAGERY AND MODEL GUIDANCE.
NXT ADVISORY: NO LATER THAN 20220517/1915Z=

I’ll post new advisories only if there is any change. Unfortunately, the CCTV images I can find online are almost a week old. Does anyone know of more frequently updated webcams?


May 15, 2022, 12:17 p.m., Pacific: An update yesterday, from Volcano Discovery — a tremendous resource.


https://platform.twitter.com/widgets.js


Darwin VAAC still has the advisory listed, but no new ones. No VONA found on the MAGMA Indonesia page, and the Anak Krakatau Twitter account (whoever is running that) doesn’t mention anything new (they did forward this tweet).

Given that relaxed attitude locally, plus the fact that the ongoing activity is effusive (red lava) rather than explosive, my concern is less (whatever that’s worth from a layperson 😄 ).

Will keep this pinned until they lower the alert level, though. Krakatau is tricky because it can’t easily be monitored, being mostly underwater.


May 14, 2022 9:12 a.m., Pacific: Darwin VAAC has issued an advisory, but I’m still looking for information from local official sources.

If I understand aircraft terminology, it wasn’t a very big emission. FL080 is 8,000 feet, right? And it was mostly steam.

Wonder if it was a one-off shot or if Anak Krakatau is feeling restless again.


May 13, 2022, 1:18 p.m., Pacific: Things are still quiet, alert level still elevated.


https://platform.twitter.com/widgets.js



May 4, 2022, 10:50 a.m., Pacific: Nothing new, but here is a neat satellite view and update in English:


https://platform.twitter.com/widgets.js


Hope it stays at this level!


April 30, 2022, 9:13 a.m., Pacific: Still quiet, still at elevated alert.

Spectacular footage of Anak Krakatau (the new central land built since the much larger caldera, mostly underwater as shown here, blew in 1883).

Twitter translation:

Another angle of the image of Mount Anak Krakatau as of April 28, 2022.

It can be seen that the crater holes that were open after the 2018 eruption and tsunami were closed and the growth of the mountain body was very significant.


https://platform.twitter.com/widgets.js



April 29, 2022 12:12 p.m., Pacific: A new cone!


https://platform.twitter.com/widgets.js


Things have been quiet, fortunately. At the moment, there only appears to be a hint of incandescence from the shore.

Per satellite view on the 27th:


https://platform.twitter.com/widgets.js


April 27, 2022, 7:06 a.m., Pacific: Per the latest VONA (scroll down):

Eruption with volcanic ash cloud at 05.00 UTC (12.00 local). Eruption and ash emission is continuing. Best estimate of ash-cloud top is around 10102 FT (3157 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer. Visuals directly from the cctv were observed eruptions with the color of the thick white-grey-black eruption smoke 3000m from the top of the volcano, the wind direction slowly to the south-southwest.

It’s night there now, and the cam view appears quite dark, though there is a hint of clouds. Whether these are meteorological or volcanic is impossible to tell (though you would think some incandescence would show if it was ash).

Per Darwin VAAC at 1115 UTC, “VA NOT IDENTIFIABLE ON LATEST SAT IMAGERY DUE TO MET CLOUD. HOWEVER, ERUPTION IS EXPECTED TO BE ONGOING.”

It is not a massive eruption, though. Authorities and Anak Krakatau, Twitter are more focused on potential for cone collapse and tsunami.

Here’s the ash advisory tweet from AK Twitter:


https://platform.twitter.com/widgets.js



Original post:

And it is firing up. Volcanologists have raised the alert level (Indonesian) and reportedly also are warning people to watch out for tsunamis, especially at night.

Anak Krakatau is a very active volcano, and I’ve been watching it but was spurred to do this post after seeing just how much deformation the volcano showed on this April 14th image, tweeted today:


https://platform.twitter.com/widgets.js


The second factor leading to a post was how the eruption looks in video currently showing with this article — the original Indonesian for the Google-Translated one linked up above the tweet.

I am strictly a layperson, so take it FWIW, but that eruptive column looks like there’s some power behind it. And this is Krakatoa.

So let’s watch this and see what happens.

Webcam. There is no live stream at the moment, but scroll down for cam images.

Global Volcanism Program.

Local monitoring updates (Indonesian).

Darwin VAAC.

Oystein Lund-Andersen, Twitter.



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