General Volcanic Activity Thread!

[The PIT]

7 hours ago, jethro said:

Is this likely to be as continuous and devastating as then?

 

Unlikely the volcano hasn't been dormant for centuries and magma has had a fairly easy passage to the surface. The volcano is another cycle of it's eruptive cycle so further Surtseyan eruptions and  possible tsunamis/base surges are possible. Surtseyan eruptions will continue until the vent is sealed from the sea once again.

[The PIT]

 

ALASKA VOLCANO OBSERVATORY DAILY UPDATE
U.S. Geological Survey
Sunday, December 23, 2018, 9:52 AM AKST (Sunday, December 23, 2018, 18:52 UTC)

VENIAMINOF VOLCANO (VNUM #312070)
56°11'52" N 159°23'35" W, Summit Elevation 8225 ft (2507 m)
Current Volcano Alert Level: WATCH
Current Aviation Color Code: ORANGE

Elevated seismicity continues. No acoustic signals have been recorded by regional infrasound sensors. Elevated surface temperatures were observed in several satellite views over the past day. Web camera views showed steam emissions.

Veniaminof volcano is monitored with a local real-time seismic network, which will typically allow AVO to detect changes in unrest that may lead to a more significant explosive eruption. AVO combines seismic, infrasound, lightning, and satellite data for rapid detection of such events.



CLEVELAND VOLCANO (VNUM #311240)
52°49'20" N 169°56'42" W, Summit Elevation 5676 ft (1730 m)
Current Volcano Alert Level: WATCH
Current Aviation Color Code: ORANGE

No unusual activity was observed in satellite views over the past day. No other activity was observed over the past day.

Cleveland volcano is monitored by only one seismic station, which restricts AVO's ability to detect precursory unrest that may lead to an explosive eruption. Rapid detection of an ash-producing eruption may be possible using a combination of seismic, infrasound, lightning, and satellite data. The web camera, one seismic station, and the local infrasound array are offline due to a equipment failure on September 23rd. This hampers efforts to rapidly detect explosive activity; however, Cleveland remains monitored with a single seismic station and regional instruments.

GREAT SITKIN VOLCANO (VNUM #311120)
52°4'35" N 176°6'39" W, Summit Elevation 5709 ft (1740 m)
Current Volcano Alert Level: ADVISORY
Current Aviation Color Code: YELLOW

Low-level unrest continues at Great Sitkin volcano. Numerous small earthquakes associated with the ongoing unrest continue to be recorded on the local seismic network. No eruptive activity was observed in cloudy satellite views of the volcano over the past day. No explosive activity was detected on a regional infrasound array on Adak Island.

Great Sitkin volcano is monitored with a local real-time seismic network, which will typically allow AVO to detect changes in unrest that may lead to an explosive eruption. Rapid detection of an ash-producing eruption would be accomplished using a combination of seismic, infrasound, lightning, and satellite data.

OTHER ALASKA VOLCANOES

Information on all Alaska volcanoes is available at : http://www.avo.alaska.edu.

For definitions of Aviation Color Codes and Volcano Alert Levels, see: http://www.avo.alaska.edu/color_codes.php

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CONTACT INFORMATION:

Michelle Coombs, Scientist-in-Charge, USGS
mcoombs@usgs.gov (907) 786-7497


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dfee1@alaska.edu (907) 322-4085

The Alaska Volcano Observatory is a cooperative program of the U.S. Geological Survey, the University of Alaska Fairbanks Geophysical Institute, and the Alaska Division of Geological and Geophysical Surveys.

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[jethro]

1 hour ago, The PIT said:

Unlikely the volcano hasn't been dormant for centuries and magma has had a fairly easy passage to the surface. The volcano is another cycle of it's eruptive cycle so further Surtseyan eruptions and  possible tsunamis/base surges are possible. Surtseyan eruptions will continue until the vent is sealed from the sea once again.

That's a relief to hear, thanks for that.

[The PIT]

Etna is also busy this Christmas https://www.skylinewebcams.com/en/webcam/italia/sicilia/catania/vulcano-etna-nord.html

[The PIT]

Death Toll rises to 373. Questions being asked about a lack of warning. Well you can't predict when a volcano will collapse and then it's question of how it collapses then will result in a wave or not. Then there's the short time period so a warning system would have been probably useless anyway.

[Mokidugway]

6 minutes ago, The PIT said:

Death Toll rises to 373. Questions being asked about a lack of warning. Well you can't predict when a volcano will collapse and then it's question of how it collapses then will result in a wave or not. Then there's the short time period so a warning system would have been probably useless anyway.

Also landslide tsunami doesn't pull back the sea and the proximity  to it ,no chance,also occurred  on peak spring tide

[The PIT]

Etna is having a flank eruption details a bit sketchy though https://twitter.com/etnaboris?lang=en

[Mokidugway]

Interesting chart of anak showing it's construction on old  crater rim, rapid building of cinder cone in last 8 years may have contributed  to major edifice failure 

Edited December 25, 2018 by Mokidugway

[Mokidugway]

13 hours ago, The PIT said:

Etna is having a flank eruption details a bit sketchy though https://twitter.com/etnaboris?lang=en

Its a beast ,was there 5 years ago ,bloody nothing happened

[Allseasons-Si]

Stromboli fairly active tonight.

https://www.skylinewebcams.com/en/webcam/italia/sicilia/messina/stromboli.html

[The PIT]

The Volcano Etna is still erupting although the flank eurption is waning. Krakatoa still rumbling away still waiting for pictures of the Island so we can gauge how much it has altered.

Some later info https://www.volcanodiscovery.com/krakatoa/2018/dec/eruption-tsunami/updates.html

Edited December 27, 2018 by The PIT

[The PIT]

Quite a big chunk of the island has gone. A ship should be going past today to get some more pics. Looking at the picture though it looks like it could have been much worse.

[The PIT]

Etna flank eruption has continued to wane almost stopping but is it all over for now? https://www.volcanodiscovery.com/etna/current-activity.html

[karyo]

1 hour ago, The PIT said:

Quite a big chunk of the island has gone. A ship should be going past today to get some more pics. Looking at the picture though it looks like it could have been much worse.

It's terrible that there is no monitoring equipment and webcams close to the volcano.

[Midlands Ice Age]

2 hours ago, karyo said:

It's terrible that there is no monitoring equipment and webcams close to the volcano.

Karyo..

The report/article that Pit posted above states that it was put 'offline' early on in the evening of the 22nd.  It is thought that the lava flows overcame the station. From photos it looks as if the whole island became covered in the lava flows, and that the extra weight caused the collapse into the seas around the island. Nothing would be able to withstand that onslaught. Also notice that the island is also quite small in area, so there is virtually nowhere that would have been spared.

I guess the question  now is what happens next?

It has been showing a monthly rhythm over the last year, with increased flows . It looks as if  water is now in the new caldera levels. Let us hope that this one is the 'pinnacle' for now.

????

MIA 

PS I have sailed past the island about 10 years ago and the station was clearly visible at that point.. 

It is in the circle in the straits and the nearest land is about 20 - 40 miles away. I do not seem to remember that there was anything else (another island) above the water level, though that could have been caused by the tides. I did look for the remains of Krakatoa but could not see anything.

Edited December 28, 2018 by Midlands Ice Age

[karyo]

2 hours ago, Midlands Ice Age said:

Karyo..

The report/article that Pit posted above states that it was put 'offline' early on in the evening of the 22nd.  It is thought that the lava flows overcame the station. From photos it looks as if the whole island became covered in the lava flows, and that the extra weight caused the collapse into the seas around the island. Nothing would be able to withstand that onslaught. Also notice that the island is also quite small in area, so there is virtually nowhere that would have been spared.

I guess the question  now is what happens next?

It has been showing a monthly rhythm over the last year, with increased flows . It looks as if  water is now in the new caldera levels. Let us hope that this one is the 'pinnacle' for now.

????

MIA 

PS I have sailed past the island about 10 years ago and the station was clearly visible at that point.. 

It is in the circle in the straits and the nearest land is about 20 - 40 miles away. I do not seem to remember that there was anything else (another island) above the water level, though that could have been caused by the tides. I did look for the remains of Krakatoa but could not see anything.

That's fair enough but they can have monitoring equipment in the nearby islands which can be seen in the image above. A webcam in particular would be showing the plume as it rises from the sea level.

[The PIT]

At the time of the wave witness's said there was nothing visible towards the island which suggests the collapse didn't spark en eruption which is surprising.  Anyway a lot of the island has gone and is no longer visible from land see https://www.volcanodiscovery.com/krakatau/news/72635/Krakatoa-volcano-Sunda-Strait-Indonesia-first-estimates-on-the-effect-of-the-tsunami-triggering-land.html

The volcano has a bit of rebuilding to do and at the moment the eruption has almost ceased. It's going to be interesting how fast it rebuilds and how much money the government is going to spend on a warning system. Considering how much of the Island has gone they were lucky that the wave wasn't larger.

 

[The PIT]

Details of the fissure eurption at Etna http://translate.google.com/translate?hl=en&sl=auto&tl=en&u=https%3A%2F%2Fingvvulcani.wordpress.com%2F2018%2F12%2F29%2Fmappa-preliminare-delleruzione-laterale-delletna-del-24-27-dicembre-2018%2F

[Mokidugway]

16 minutes ago, The PIT said:

At the time of the wave witness's said there was nothing visible towards the island which suggests the collapse didn't spark en eruption which is surprising.  Anyway a lot of the island has gone and is no longer visible from land see https://www.volcanodiscovery.com/krakatau/news/72635/Krakatoa-volcano-Sunda-Strait-Indonesia-first-estimates-on-the-effect-of-the-tsunami-triggering-land.html

The volcano has a bit of rebuilding to do and at the moment the eruption has almost ceased. It's going to be interesting how fast it rebuilds and how much money the government is going to spend on a warning system. Considering how much of the Island has gone they were lucky that the wave wasn't larger.

 

Could be quick Paracutin in Mexico  acheived  a hight  of nearly 500 metres from nothing in 8 years

[The PIT]

Perhaps it will do this https://www.youtube.com/watch?v=ztDLLYg1gS4

[Mokidugway]

3 minutes ago, The PIT said:

Perhaps it will do this https://www.youtube.com/watch?v=ztDLLYg1gS4

Link not working 

[The PIT]

3 hours ago, Mokidugway said:

Link not working 

Worky here

[Mokidugway]

13 minutes ago, The PIT said:

Worky here

Its ok worked on my quote

[Summerstorm]

Apparently death toll is over 400 now with 20+ people missing and 40,000 displaced according to BBC article on Anak Krakatau eruption. Also height of the cone is now only 110m vs 340m before the eruption - https://www.bbc.co.uk/news/science-environment-46707731

I'd be more worried if it was Tambora erupting as it is known for massive eruptions (i.e it's 1815 eruption which was 4x more powerful than the 1883 eruption from Krakatoa and has been dormant for over 50 years. 

Edited December 29, 2018 by Summerstorm

[Snipper]

On 28/12/2018 at 11:34, Midlands Ice Age said:

PS I have sailed past the island about 10 years ago and the station was clearly visible at that point.. 

 It is in the circle in the straits and the nearest land is about 20 - 40 miles away. I do not seem to remember that there was anything else (another island) above the water level, though that could have been caused by the tides. I did look for the remains of Krakatoa but could not see anything.

Must have been a really interesting trip. As most of the original Krakatoa was blasted away there may not have been much to see if conditions were not clear.