General Volcanic Activity Thread!

[The PIT]

Darn missed it Etna was busy yesterday with a nice pyroclastic flows as well. This serves as a reminder that even quiet volcanos can produce the most deadly item in the volcanic armery.  Luckily small and no one was affected doe smake one wonder what would happen if the NSE slid into Valle de Bove.

 

[The PIT]

Interesting watching the lava break through the sides of the volcano in La Palma.

[The PIT]

The right flank of the cone maybe about to go as more fissures and vents open up,

 

 

[matty40s]

 

Some stunning footage by the Geological Institute drones, they are getting quite good at this now!

[The PIT]

It's repairing itself faster than it can collapse. Destruction v construction.

[SnowBear]

59 minutes ago, The PIT said:

It's repairing itself faster than it can collapse. Destruction v construction.

I think there is more material there than appears, the camera angle I think makes it look thin. 

As the cinder builds up the top layer sheds when it gets too steep to hold that top layer exposing still red hot rocks underneath, and then rebuilds, over and over, slip, build, slip, build. 

I did wonder if we would see a spillway appear earlier when the little lava vent on the left closed up and the old lava flow reappear with its tube roof collapsing in the lower middle of the view on TV Canaria but watching since I am fairly certain we will just keep seeing what we have so far this evening now. 

What will happen when the active pulsing vent begins to get choked up due to internal collapses is another matter, we may then see new lava vents appear through the cinder on that face. 

Earthquakes have increased today, fountain height a bit higher I estimate somewhere around 3-400m. 

2,146 buildings destroyed, 66km of roads destroyed. 203 million cubic metres of lava estimated so far. 

It doesn't look line stopping any time soon. 

[SteveB]

The side split open early this morning,  around 2-3am I think.  As Pit alluded to, it repaired it's self pretty quickly. 

[SteveB]

More cracks appearing in the side now, 3 at the last count!

[SnowBear]

Beginning to create a spillway by the looks of it, internal lava level has increased as the vent has clogged up and also the lower vent slowed somewhat from yesterday putting pressure on the cone higher up. 

Amazing to watch. 

[SteveB]

Looks like it could split the side!

[SnowBear]

5 minutes ago, SteveB said:

Looks like it could split the side!

Fortunately this is happening on a side where the outflows should be across the lava fields created in previous weeks and not towards more buildings and villages to the north. A fairly direct route to the sea too. 

Question is can it erode the side wall back and will we see the rim bridge collapse. 

[SteveB]

Good viewing over the next few hours!

[SnowBear]

The camera on Afar TV which is fed from Canaria TV hasn't moved since this started, and trying to remember the shape from a coupe of weeks ago isn't that easy as the cone has changed shape many times now but I think that "new" vent there is a reactivation of what was the front vent which became choked and the one behind took over. 

It's now cut quite gorge back. 

Work calls lol, back later

[SnowBear]

Last look before heading out, now daylight has arrived there... Might not get to a spillway. 

That new/old vent will start a cone building process of its own now and will start filling the gorge cut earlier. We shall see. 

[Gray-Wolf]

The number of EQ's yesterday was the real story IMHO?

Today looks to have set off with similar vigour!

I have to link the uptick with the arrival, 2 weeks back, of larger quakes in the lower chamber (Crust/Mantle boundary 30 to 40km?)

Cones in Iceland took 3 weeks for such quakes to show impact at surface so this is in the right time frame & EQ's are now firmly centred in the mid chamber (10 to 15km)

[SnowBear]

1 hour ago, Gray-Wolf said:

The number of EQ's yesterday was the real story IMHO?

Today looks to have set off with similar vigour!

I have to link the uptick with the arrival, 2 weeks back, of larger quakes in the lower chamber (Crust/Mantle boundary 30 to 40km?)

Cones in Iceland took 3 weeks for such quakes to show impact at surface so this is in the right time frame & EQ's are now firmly centred in the mid chamber (10 to 15km)

Eq activity is worrying, 144 in 12 hours now. 

During the past 24 hours, La Palma volcano was shaken by 1 quake of magnitude 4.0, 111 quakes between 3.0 and 4.0, and 151 quakes between 2.0 and 3.0.

Biggest quake today: 4.0 quake La Palma Island, 14 km southeast of Los Llanos de Aridane, Spain, Oct 24, 2021 6:15 pm (GMT +1) 17 hours ago

Most recent quake: 3.6 quake La Palma Island, 14 km southeast of Los Llanos de Aridane, Spain, Oct 25, 2021 10:22 am (GMT +1) 25 minutes ago

 

La Palma, Canary Islands: eruption and seismic crisis Sep 2021 - news and activity updates

WWW.VOLCANODISCOVERY.COM

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La Palma, Canary Islands: eruption and seismic crisis Sep 2021 - news and activity updates

 

[Gray-Wolf]

Hi SnowBear! plenty of what looks like 'harmonics' in among all the more defined quakes to so I wouldn't be expecting the output of lava to drop off any time soon either?

Luckily most of the output is flowing over older flows so it's not causing more damage to the infrastructure there?

Certainly worth keeping an eye on over the coming days I reckon?

[SnowBear]

1 hour ago, Gray-Wolf said:

Hi SnowBear! plenty of what looks like 'harmonics' in among all the more defined quakes to so I wouldn't be expecting the output of lava to drop off any time soon either?

Luckily most of the output is flowing over older flows so it's not causing more damage to the infrastructure there?

Certainly worth keeping an eye on over the coming days I reckon?

Hey GW, hope alls well with you?

I am hoping the switch to the older flows does indeed lessen the likelyhood of more villages and farms etc damaged, and that more direct route to the sea, problem is when the hardened flows build up higher than the surrounding land and its spills outwards, which is what was happening in La Laguna, its kept getting further and further north. 

It's really been captivating watching these past couple of weeks, mostly because its a relatively small volcano the cameras have been able to be fairly close. 

It's going to take a good few years for it all to cool down though once it's done, I saw someone say the lava from the 1970s eruption further south was still hot in 1982 when they visited, could mean that area of the island now will be uninhabitable for at least a couple of generations. 

[SnowBear]

Unfortunately looks like the lava vent to the left (North) is opening again, which will reliven the northern flows, did hope this mornings activity might stop that increase in the North. 

[SnowBear]

Little lava vent (named Baby vent in Afar chat) reopened, forced open some old lava ways and caused a huge slump, amazing footage at the moment on Afar TV feed 1.

[SnowBear]

The action is from about 18.50 onwards

 

[The PIT]

Needs a new cone looks pretty mangled after today's slow motion collasp

[SnowBear]

Back to cone building stage with large lava fountains now set in a deep ravine with large lava outflow, will be a couple of collapses no doubt of the ravine sides as we go along. 

Only one vent visible on the feeds but the vents behind are still active, just the view blocked by volcanic ash and gas clouds. 

Again a big number of eqs today, mainly around the 15 to 10km level in depth. 

This isn't giving up any time soon. 

 

 

[matty40s]

 

Edited October 26, 2021 by matty40s

[SnowBear]

Huge changes to the landscape now on the video feeds on La Palma. 

A more stable morning this morning I think, appears to be one vent now with near constant blowtorch like gas venting, and a large outflow of lava down the spillway created last night.

Lava towards LaLaguna has stopped it seems. 

AfarTV feed 1 shows how much of the cone slumped. Very much now back into cone building phase if the magma supply continues. 

Havent checked eq data this morning though did see one reported in the chat at 48km depth at 3.9mw.