Volcano eruptions

[Baron Greenback]

Thought I would make a more general volcano thread, found this great footage of Hunga Tonga volcano eruption in the pacific ocean on December 31st.


Do love the power of volcano among other natural phenomena, also follow the volcano in Fagradalsfjall Iceland that the during the past 14 days the area was shaken by 14 quakes of magnitude 4.0 or above, 94 quakes between 3.0 and 4.0.

[jdw100]

I have a live(ish) one about 70km away.

https://www.bbc.com/news/world-asia-42133502

Could see the smoke plume on a good day.

I still find it amazing to walk ten minutes from my house to a higher point and see mountains and volcanos in the distance.

[Baron Greenback]

Wow you have an exciting mountain to be close to, stay safe and away from the lahars.

[Baron Greenback]

Tsunami hits Tonga after giant volcano eruption amazing what power just a 30cm wave has.
https://www.bbc.co.uk/news/world-asia-60007119

[Baron Greenback]

Further reading there was a 2nd landslide and eruption on the 15th where estimated 0.5 cubic kilometer of rock caused a 2.5m larger wave and looks like 95perce of island has not gone. The the sound of eruption was heard in Alaska 9,300km away.

[Beati Dogu]

There's some impressive views of it from a couple of weather satellites. As shown in this video:

https://youtu.be/zoMRwyNhqJ4

[Baron Greenback]

Update info on the Tonga eruption, that a lot of lighting strikes, 55 per second for an hour

[Beati Dogu]

These guys on Tonga just happened to be filming at the coast:



They seemed more interested in saving the camera than each other.

[Hill92]

Beati Dogu said:

These guys on Tonga just happened to be filming at the coast:



They seemed more interested in saving the camera than each other.

Not Tonga. A different tsunami elsewhere.

[Baron Greenback]

Hill92 said:

Not Tonga. A different tsunami elsewhere.

Amazing what local geography can effect the wave height, 1958 Lituya Bay earthquake landslide and megatsunami washed out trees to a maximum elevation of 1,720 feet (524 meters) at the entrance of Gilbert Inlet. As a geologist I love the shear scale of historical eruptions and chaos as the results earthquakes and landslides.

[Baron Greenback]

Hunga Tonga Island has had 40 shallow eartquakes between 4 and 5 occurred in 24 hrs which could be from fresh influx of magma or rebound from the last eruption or another possibilities is collapse of the caldara. From what few peopleare saying could be all 3 options.

[Baron Greenback]

Hate to be a local with Taal volcano in Philippines, lake with pH of 1.9 and 70c.

[Russ35]

Not quite on the scale as the other volcanos on this thread, but the one in Iceland that became a tourist attraction for a few months in March '21 started up again yesterday afternoon.

https://www.youtube.com/watch?v=ihTaTv-24aU

There were some stunning pictures and drone footage recorded from last year. Have a look back on the The Reykjavík Grapevine YT channel.

https://www.youtube.com/channel/UCXDn1ItTmeGarenRL...

Edited by Russ35 on Thursday 4th August 12:49

[Baron Greenback]

Aye been watching it live, at night was great to see the lava pool it is generating. There is good possibility that the fuller the pool gets it may overflow towards the capital Reykjavik. On the 2nd August 10,000 earthquakes monitored over 48hrs indicated a magma intrusion.
Edit

Edited by Baron Greenback on Thursday 4th August 17:03

[Baron Greenback]

Looks like the main vent is shortening to about 20m in length but increasing output erupting to 60m height and forming a shield volcano. The other vents have subsided.

[Scrump]

Posting to say that I do read the updates to the thread even though I have nothing to add.
Keep ‘em coming

[Beati Dogu]

It’s also impressive how big some of these volcanoes can be. When I was a kid we lived in Tehran, Iran for a couple of years. From the roof you could see the year round white snow cap of Mt Damavand, about 50 miles away. The summit is just over 18,000 feet above sea level and it’s the largest volcano in Asia. It hasn’t erupted for about 7,000 years, but it’s potentially still active.

[Baron Greenback]

Nice volcano Mount Damavand is a very high volcano, highest in Asia. Love the shear scale of geology. Similar type of volcano to the Iceland but on a truly enormous scale was the deccan flats in India the fissure erupted for estimated 30,000 years covering India with 500,000 km2 known area but estimate to have been as large as million square km, thas about 1/2 of India covered with upto 2km thick magma. This made global drop in temperature of 2 degree C.

Iceland footage been slim as the sulfur dioxide (very light blue clouds) has been cloud been flowing wrong direction and access to the mountain been limited. The fissure has created a 15 foot spatter cone and magma output has deceased to estimated to 15 cubic m3 but still a lot higher than last year. The numbers of tremors are still increasing daily.


In Japan the Stratovolcano Sakurajima alert has been raised to the highest level.

[dukeboy749r]

Other than this thread, I've seen or heard nothing about this.

Yet 'this' appears just as newsworthy - given the global impact a big volcano can have (not to mention the local impact, of course)!

[Baron Greenback]

The Icelandic Fagradalsfall volcano has impact to locals as sulphur dioxide affects air pollution but as the magma doesn't have much water content and only flows land. 2010 the Eyjafjallajökull volcano under a glacier in Iceland which created more explosive reaction due to high water content creates more news worthy story due to the fine dust it thrown up into flight path and disrupted travel down to UK and eastward towards Sweden.

It looks like the Japan Sakurajima Stratovolcano has quietened downed after 1 impressive outburst.