The Hunga Tonga-Hunga Ha’apai explosion on 15-January-2022

This is a special article about the eruption and the explosion in Hunga Tonga-Hunga Ha’apai volcano, close to Tonga in the Pacific Ocean. I don’t know a lot about this volcano so I might get details wrong. This is also not a long article, because of lack of my knowledge. Because of copyright, I can’t use any images in this article.

At 04:00 UTC on 15-January-2022 an eruption started in >Hunga Tonga-Hunga Ha’apai volcano, that is 65 distance from Tonga islands (population around 100.000). In what seems to be a process that only took about 1 to 3 hours, the eruption exploded with largest eruption force in modern history. This is possibly largest eruption since 1912 (Alaska) in the world or even largest eruption since Krakatoa in 1883. According to articles, research into this volcano suggest that it has an explosive period eruption phase every 1000 years, the last one being around the year 1100. The length of this eruption seems to have been 3 to 5 hours in total and in last 24 hours there have been reports of a lot smaller eruptions happening. Each of them only lasting few hours at most.

When the explosion happened it created a tsunami that hit Tonga few moments later with waves up to 1,13 meters high and Fiji islands where it with waves that where around 80 cm high (reports). Around 13 hours later, the tsunami hit the west coast of the United States and Canada, Los Angeles area and other coastal areas. The sound wave that followed was heard clearly 2300 km away in New Zealand and in Alaska at distance of 9373 km, the explosion was also heard clearly in Fiji islands that are in 700 to 1000 km distance. The air pressure wave that happened during the explosion did go over the Earth two times, it was detected in Iceland at around 17:00 to 18:00 on 15-January-2022 and the second wave was detected on 16-January-2022 at around 05:00 to 06:00 in Iceland.

It is going to take years to understand the size and effects of this volcano explosion because how remote it is, since it is out in the ocean and next populated area is 65 km away and that’s the only monitoring of this volcano, since other options are not possible for monitoring of Hunga Tonga-Hunga Ha’apai volcano.

The effects of the explosion was largest in Tonga that is now cut off from the internet because of damage to undersea fibre cable that connects them to the internet. How long that repair work is going to take depends on a lot of things, but it can take weeks or months until fibre connection is restored. There was also a lot of tsunami damage in Tonga, how extensive it is I don’t know because of lack of reports.

This is all I have for now on this eruption. I don’t know if I’ll write another article about this event, since I only cover world events that are major events and this volcano explosion has been classified in my system as a major volcano event.

More detailed article with images of the volcano

Why the volcanic eruption in Tonga was so violent, and what to expect next (The Conversation)

Magma on its way up the crust in Fagradalsfjall mountain, last measurements shows 1600 meters left (1,6km)

According to a news on Ví (linked below) the magma has started to rise in Fagradalsfjall mountain. At the time of the measurement from a satellite the magma had around 1600 meters (1,6km) left until it reached the surface. At the speed the magma was travelling, around 130 meters a day an eruption was expected to happen around 11-January-2022. This is the current estimate, but that might change of the magma increases or slows down the speed it is going up in the crust.

It is unclear what area is going to erupt since the new dyke is more alongside the older eruption dyke. There is more chance than less that new craters are going to open up and start erupting, some of the area is under fresh lava from earlier eruption. Making the area look interesting when this eruption starts.

Icelandic News

Kvikan á uppleið en á enn 1.600 metra eftir (Ví

Earthquake swarm in Bárðarbunga volcano

Today (29-December-2021) at 14:46 UTC an earthquake with magnitude of Mw3,6 (Icelandic Met Office) or magnitude of mb4,5 (EMSC website information here).

Green star in Vatnajökull galacier in Bárðarbunga volcano. Few red dots show smaller earthquakes that also happened in Bárðarbunga volcano
Earthquake activity in Bárðarbunga volcano. Copyright of this image belongs to Icelandic Met Office.

This earthquake activity is normal and is because of inflation that is now happening in Bárðarbunga volcano. Eruption is not going to happen now. It might be few more years or few more decades until that happens.

Strong earthquake activity in Fagradalsfjall mountain, Krýsuvík-Trölladyngja volcano

This information is going to get outdated quickly.

There is now a constant earthquake swarm activity in Fagradalsfjall mountain, part of the Krýsuvík-Trölladyngja volcano system. More than a dozen of earthquakes have been larger than magnitude 4,0 and it doesn’t look like this earthquake activity is doing to stop soon. Largest earthquakes in last few hours had a magnitude of Mw4,8 and Mw4,5. The earthquake north of Grindavík town appears to be a tension breaking earthquakes because of magma inflation in Fagradalsfjall mountain.

A lot of earthquakes on Reykjanes peninsula, more than a dozen green stars, hundres of red dots showing smaller earthquakes
The earthquake activity on Reykjanes peninsula. Copyright of this image belongs to Icelandic Met Office.
Heavy earthquake activity shown on Icelandic Met Office earthquake tracker. The density of earthquake activity has the image swamped with activity
Earthquake activity on Reykjanes peninsula in Fagradalsfjall mountain for the last 48 hours. Copyright of this image belongs to Icelandic Met Office.

This earthquake swarm is close to Grindavík town, this is a similar situation that happened earlier in the year 2021. Just before the eruption in Fagradalsfjall mountain. This earthquake activity is going to continue to grow until an eruption starts. This earthquake activity also happens in a wave, resulting in it lower earthquake activity between powerful earthquake activity. I am expecting more strong earthquakes in next few days, unless an eruption starts in Fagradalsfjall mountain or nearby area.

Update on activity in Krýsuvík-Trölladyngja volcano in Fagradalsfjall mountain, eruption is going to happen soon

Information here are going to get outdated quickly.

The earthquake activity in Fagradalsfjall mountain continued on 22-December and on 23-December-2021. Largest earthquake in last few hours had a magnitude of Mw4,9 and was felt over a wide area. No property damage has yet happened because of this earthquake activity so far.
There are now three centres where the earthquake activity is happening. The first one is north of the large crater, the second one is under the main crater and the third one is in Nátthagakrika (about south-west of the large crater). This is the area where people used to walk up the eruption on walking paths A and B.

Dense earthquake activity on Reykjanes pensiula with lot of earthquakes and green stars and red dots
The heavy earthquake activity on Reykjanes peninsula. Copyright of this image belongs to Icelandic Met Office.
Plot showing the magnitudes of the earthquake and density. A lot of earthquake that go above 3 line and dense dots with smaller magnitudes
The density of the earthquake activity in the current earthquake swarm. Copyright of this image belongs to Icelandic Met Office.

This earthquake activity is not going to stop until an eruption starts. When that happens is not possible to know. If a new crater opens up that is going to result in ever growing and stronger earthquakes. If the crater that is already in place starts erupting again, that is going to result in some earthquake activity. What is known is that the magma is going to go the path of least resistance, whatever that path might be. At the writing of this article, over 6000 earthquakes have been recorded and around 50 to 100 of them have been larger than magnitude 3,0.

Earthquake swarm in Krýsuvík-Trölladyngja volcano, close to Fagradalsfjall mountain, eruption possible soon

This information is going to get outdated soon. Since the situation is changing quickly.

It is possible that a new eruption is about to start in Fagradalsfjall mountain in Krýsuvík-Trölladyngja volcano. This earthquake activity started around 17:00 UTC on 21-December-2021 and has been growing since then. At the writing of this article the largest earthquake had a magnitude of Mw3,3. Over 150 earthquakes have been recorded at the writing of this article. This earthquake activity doesn’t seems to be slowing down.

Earthquake activity in Fagradalsfjall, a lot of red dots, green star shows the largest earthquake
Earthquake activity in Fagradalsfjall mountain. Copyright of this image belongs to Icelandic Met Office.

The situation is changing quickly. As of writing this article a new eruption has not yet started but that might only be question of hours until an eruption starts. This might happen during the night or sometimes tomorrow during the day. There is not any way to know that for sure at the writing of this article.

I’ll post update late tomorrow if this changes and a eruption starts. Since I’ll be busy during the day the late article can’t be helped.

Earthquake swarm north of Grindavík town

Today (8-December-2021) an earthquake swarm started north of Grindavík town. Largest earthquake in this swarm so far had a magnitude of Mw3,1 at 10:44. The news doesn’t say if this earthquake was felt in Grindavík. Earthquake activity has been going up recent weeks since the eruption in Fagradalsfjall ended on 18th September 2021. A swarm of smaller earthquake activity is currently ongoing in this same area at the writing of this article.
Continue reading “Earthquake swarm north of Grindavík town”

Earthquake with magnitude Mw3,6 in Grímsfjall volcano, no eruption yet

I’ve been trying to wait for information about the activity in Grímsfjall volcano. A new cauldron was discovered yesterday (05-December-2021). It is possible that an small eruption took place in the side of Grímsfjall volcano and didn’t break the glacier. It might have been a short eruption if that is what happened. Harmonic tremor data is unclear on this so I can’t give any good answer. At 06:16 UTC an earthquake with magnitude of Mw3,6 took place. I poorly recorded it my seismometer and it seems to have been a low period earthquake. Suggesting that a magma pushing up was the reason this earthquake happened.
Continue reading “Earthquake with magnitude Mw3,6 in Grímsfjall volcano, no eruption yet”

Sharp change in harmonic tremor in Grímsfjall volcano

This situation is unclear and nothing has been confirmed as of writing of this article. This seems to have started about 1 hour ago and there has been a change in the harmonic tremor levels at Grímsfjall volcano. This is not yet the super sharp change I did see in May-2011 when that eruption happened. This is however is possibly a change in harmonic tremor that is consistent with magma moving inside the volcano system. Earthquake activity has been minimal in the last 24 hours.

Harmonic tremor on blue, green and purple harmoniuc tremor bands going up sharply in the last one hour.
Harmonic tremor changes in Grímsfjall volcano in the last one hour (article written at 17:34 UTC on 04-December-2021). Copyright of this image belongs to Icelandic Met Office.

This is a monitoring situation currently. Sometimes an eruption happens after a glacier flood or doing a glacier flood in Grímsfjall volcano. At other times however nothing happens and it is not possible to know what happens now.


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