this post was submitted on 19 Dec 2023
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[–] A_A@lemmy.world 22 points 11 months ago* (last edited 11 months ago) (2 children)

You have either ~~plutonic~~ or ~~basaltic~~ volcanoes. This is a quiet ~~plutonic~~ one : it's lava flows without explosions, so, there could be much worse scenarios. But still, it is a big one.
Edit : My use of "plutonic" might be outdated or wrong : I think this is the old way it was described, but today, I cannot find a reference to support it.

[–] Guessologist@lemmy.world 15 points 11 months ago (1 children)

It's all about how much silica is in the lava - not much and you have basalt, fairly runny so the gas escapes and you get fire fountaining and lava flows. More silica gives you very viscous lava like rhyolite or andesite - traps the gases, far more explosive and dangerous eruption styles.

[–] A_A@lemmy.world 2 points 11 months ago

You are right
...and my use of "plutonic" is either outdated or plainly wrong.
I found this for anyone who wants to read more :
https://en.m.wikipedia.org/wiki/Lava
"Properties of lava"

Because of the role of silica in determining viscosity and because many other properties of a lava (such as its temperature) are observed to correlate with silica content, silicate lavas are divided into four chemical types based on silica content:
felsic,
intermediate,
mafic, and
ultramafic.

[–] Neato@kbin.social 7 points 11 months ago (2 children)

The one a few years ago that stopped flights in Europe was a basaltic one?

[–] logi@lemmy.world 15 points 11 months ago

The difference there was that it came up under the glacier Eyjafjallajökull and the magma meeting ice caused steam explosions throwing ash and other material high in the air.

[–] A_A@lemmy.world 1 points 11 months ago

Oups, maybe this is an outdated terminology : I couldn't find any references to support it. Please read my other comments and "edit" around here.