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Super eruptions: Ring of Fire - tectonic journeys in E Asia

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Did a volcanic eruption nearly wipe out modern humans - some 74 thousand years ago? The jury is out - but it doesn't mean that the eruption itself didn't have global impacts. Find out more about this and other super-eruptions - the geology behind them and their relationship to the "Ring of Fire". This film compares the cataclysmic eruption of #Toba with #Pinatubo and #Tambora. It's one of a sequence that accompanies season four of the BBC's "Race Across the World. #geology #sumatra #supervolcano #tectonics #ratw #ytt

Опубликовано:

6 сен 2024

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Комментарии : 18

@robbutler2095 3 месяца назад

Apologies - I'm misquoting by an order of magnitude! The eruption ejected 2,800 km^3 dense-rock equivalent... still the greatest eruption in the past 2 Myr

@matusknives 3 месяца назад

I just googled it as those 28,000 sounded like a little too much. I guess we would no be having this conversation has that been the case 😁 I is still a mind boggling and frankly for me not really possible to fully grasp how that amount of energy could have been accumulated and then released so violently, that it ejected such an incredible volume of material.

@Drianz5142 3 месяца назад

What about supervulcano Semilir on Java island? I read on google that the eruption happened in the Miocene era and the ignimbrites are thicker than Toba.

@robbutler2095 3 месяца назад

Plenty of old super-eruptions in the geological record... older than Toba. but not experienced by homo sapiens....

@gerryjamesedwards1227 3 месяца назад

Hi Rob, isn't Campo Flegrei in Italy also capable of producing super-eruptions? I noticed it wasn't on the map at the end.

@robbutler2095 3 месяца назад

Yes indeed - just that there's no history of a VEI =8 eruption... (VEI 7 is it). Which is not to same that if (when?) it goes it won't be devastating for a swathe of Italy. There are at least another half-dozen Campo Flegrei's around the World....

@gerryjamesedwards1227 3 месяца назад

@@robbutler2095 thanks!

@robertab929 2 месяца назад

Campo Flegrei ejected 300 km2 in biggest eruption.

@HamzehRezaei-dp7sc 3 месяца назад

Thank you

@MrTomcat104 3 месяца назад

Thank you so much for your video on Toba and other super eruptions, Prof. Butler. Really fascinating stuff. Having visited the caldera many years ago, I've long been curious about Toba. The Toba eruption ejected so much ash into the atmosphere. In the short-term, the ash deposit impact is bad for human health, access to drinking water and killing plants and crops I guess. But in the longer term, could it actually have some positive effect? Volcanic ash can make soil more fertile correct? Could plant growth actually be stronger in the longer-term thanks to the ash? So there could be more plants for humans to consume? (I guess this is before development of agriculture, so it would mean eating wild plants).

@robbutler2095 3 месяца назад

Certainly volcanic eruptions are important for supplying nutrients for soil... though as you say - formal agriculture started long after Toba...

@MrTomcat104 3 месяца назад

@@robbutler2095 Many thanks!

@TheHoveHeretic 3 месяца назад

Fascinating video Rob. Thanks. Enquiry: Is the hypothesised 'DNA bottleneck' around the time of the Toba eruption apparent in the DNA record of species other than us uppity modified chimps?

@robbutler2095 3 месяца назад

Good question - especially for the primate populations (inc in SE Asia). Don't know...

@bigantplowright5711 3 месяца назад

They are nothing really compared to the Deccan and Siberian Traps, are they Rob

@robbutler2095 3 месяца назад

Not in terms of volume for sure... though the duration of eruption for the flood basalt systems were significantly more protracted. Interesting to be able to get climate impacts - but hard to calculate for the much much older eruptions...