Posts

Posted on

Earthquake swarm in Hengill volcano

Yesterday (21.04.2012) an earthquake swarm started in Hengill volcano at 18:57 UTC on 21.04.2012. The area in question is well known for having earthquakes swarms during past few months. It seems that this earthquake swarm is not over, and there is also a risk of stronger earthquakes in Hengill volcano than have currently happened. But the largest earthquake so far was event with the magnitude ML2.8.


Earthquake activity in Hengill volcano at 00:50 UTC on 22.04.2012. Copyright of this picture belongs to Iceland Meteorological Office.

Icelandic news about this earthquake swarm.

Jörð skelfur við Hellisheiðarvirkjun (mbl.is, Icelandic)

Posted on

Donations for Skeiðflöt geophone station needed

I have been having issues with Skeiðflöt geophone stations for the past few months. The problems is that I use WLAN (Wireless Network) to get the data from the geophone to the internet, and soon to my main earthquake computer. However, I have been having connection issues. This is because the wireless signal where the computer is located is quite bad. The signal is only 11dB according to the planet wireless hardware that I am using, I think that is quite poor signal. I have already tried to increase the gain by sending and bigger antenna to the people how are hosting the hardware for me. But it did not work as I hoped for.

Two new AP points (one acting as a repeater for the signal) would solve this issue permanently. But they cost 529DKK (current exchange rate), €71, $93, 58GBP (+1 Ethernet cable). Currently I am moving and bit short on cash because of that, at least I want to spend the little money that I have carefully at the moment. I am not sure if I can buy this at the moment my self. I would have to check my bank account first. But any donations to help me solving this issue are welcomed.

Thanks for the help!

Moving

I am currently moving to Denmark in next few days. So updates might bit lacking or late of anything happens in Iceland because of that. I will do my best to keep this blog updated if anything happens. My laptop hard drive is dying due to old age. There nothing I can do to fix it at the moment (it costs money that I do not have).

Posted on

Earthquakes recorded in Snæfellsjökull volcano

Snæfellsjökull volcano is not often in the news in Iceland. But today there was a short news about it due a study that was done last summer on earthquake activity in Snæfellsjökull volcano. The study was to see if there where any earthquake activity in Snæfellsjökull volcano. The results are really interesting, the main result was there is a lot of earthquake activity in Snæfellsjökull volcano. But also that most of the earthquakes take place on the depth from 9 to 13 km depth. This study was done by Matteo Lupi and Florian Fuchs at Bonn University in Iceland.

The reasons for earthquake activity in Snæfellsjökull volcano is magma. There are not a lot of tectonic movement in Snæfellsjökull volcano area. As it is a volcano zone, but not a rift zone as is the case in most areas of Iceland. But so far it seems that there is no risk of volcano eruption for now. At least that is the opinion for the moment.

Image removed at the request of its author.

Currently there is no permanent SIL network (IMO wants to install SIL stations, but they lack funding to do so) or other type of Seismometer network on Snæfellsnes peninsula. This is bad, because this area has three active volcanoes that erupted around 1000 years ago. Along with populated areas close to this volcanoes. I plan on trying to setup few geophones in that area if I can. But currently I do not have any money or way to install and run geophones on Snæfellsnes peninsula. My closest geophone to Snæfellsnes peninsula is at Hvammstangi village. Closest the distance is around 84 km or so to the Ljósufjöll volcano. But that means I can record earthquakes down to ML1.0 in the best weather. But since I just have one geophone in this area at the moment. I cannot locate any earthquakes. I just know that they take place.

This is based on blog post from Haraldur Sigurðsson, geologist.

Blog post and news about this in Icelandic

Jarðskjálftar undir Snæfellsjökli kalla á skjálftamælanet (blog.is, Icleandic)
Þörf á skjálftamælum við Snæfellsjökul (mbl.is, Icelandic)

Blog post updated at 20:10 UTC on 17.04.2012
Blog post updated at 20:13 UTC on 17.04.2012
Blog post updated at 15:23 UTC on 20.04.2012

Posted on

Askja lake ice-free mystery deepens

A short update on Askja volcano ice-free lake.

There have been news about the tour of geologist to Askja lake this week in the news. So far the result are puzzling. It turns out that Askja lake is just 1C, but that is normal for this time of year. So why it is ice-free remains a mystery at current time. Data from GPS and seismometers. Samples of the water has been taken also for a analyze and review of weather condition’s is under way. But so far the Askja lake mystery deepens.

News about Askja volcano and new video of Askja volcano. Use Google translate in the hope to understand what is sad.

Ísleysið á Öskjuvatni er ráðgáta (Rúv.is, Pictures, Icelandic)
Loftmyndir af Öskjuvatni (Video of Askja lake, Icelandic)

Posted on

Ice free Askja lake due to increased hydro-thermal activity

According to news on Rúv scientists are now on there way up to Askja volcano to see what is going on and why Askja volcano has become ice-free. But it now believed that increased hydro-thermal activity in Askja volcano is the reason why Askja lake got ice-free during middle of winter.

The tour is expected to last for around 3 to 4 days if the weather is good. GPS data is also going to be collected in this trip to Askja volcano.

Iceland news about this. Use Google translate in order to try and understand this.

Aukinn jarðhiti bræddi ís á Öskju (Rúv.is, Icelandic)

This blog is shorter then normal because the hard disk in my laptop is giving up. I am going to try and setup linux based USB stick to boot the computer up. That should resolve any major issue that I am currently having like speed, sometimes just opening up a new browser window takes up to two minutes due to how slow the hard drive is now.

Posted on

Harmonic tremor event in Hamarinn volcano

Tonight there was an small harmonic tremor event in Hamarinn volcano (Loki-Fögrufjöll, Bárðarbunga). This event was not big. But did appear on the Skrokkalda SIL station and on Grímsfjall SIL station. The pattern that is now appearing is the same one that did appear in July 2011 in the minor eruption in Hamarinn volcano. But that event took place week after Katla volcano minor eruption.


The harmonic tremor pulse on Skrokkalda SIL station. This is most likey from Hamarinn volcano. Copyright of this picture belongs to Iceland Meteorological Office.


The harmonic tremor pulse on Grímsfjall SIL station. This is most likey from Hamarinn volcano. Copyright of this picture belongs to Iceland Meteorological Office.

What gives clues that this Hamarinn volcano is that few days ago it had minor earthquake activity. But this area does not seem to need a lot of earthquake activity before a minor eruption takes place. Why that is I have no idea at present time.

I am going to update this blog post as event progress.

Posted on

Scary news about eruptions in Iceland in The Telegraph

The newspaper The Telegraph has scary news about volcanism in Iceland. They have scary claims like this one here.

[…]

Katla’s eruption in 1918 produced five times as much ash as the 2010 Eyjafjallajökull one. A major eruption could result in large parts of Iceland being flooded as snow and ice melted; significant poisoning of Icelandic agriculture; destruction of property; and, of course, the grounding of aircraft across Europe.

[…]

Well, the Katla volcano has many different types of eruption. For instance, the July 2011 eruption in Katla volcano was small. There is no way to know what happens until a eruption starts in Katla volcano. When ever that might. As for “large part of Iceland being flooded”, this is just rubbish and bad reporting. Less then 1% of Iceland would get flooded in the case of eruption in Katla volcano. What area exactly depends on where the eruption takes place under the glacier. The largest area that can get flooded if the glacier if the flood goes down Þórsmörk and close to the area east of the village of Hvolsvöllur. Eruption in Katla volcano is going to destroy roads, bridges and other things in its path. But that is to be expected. In fact, Icelanders living in the area well aware of what a eruption in Katla volcano means to them.

[…]

If enough material is ejected it could even have a cooling effect on the global climate for a few years. A precedent for that would be the 1783-84 eruption from the fissure of Laki, which is part of the same volcanic system, Grímsvötn, that erupted last year. This was a very large eruption of 15 cubic kilometres (3.6 cubic miles), compared to the fraction of a cubic kilometre ejected in 2010, and had a huge impact on the northern hemisphere, reducing temperatures by up to 3 C.

[…]

Well, no. The reason is that Katla volcano is unable to make that large eruptions most of the time. The largest eruption that is known is the Eldgjá fissure eruption in Katla volcano that took place sometimes around the year 934. As for cooling it is worth noticing that Mount Tambora eruption that was VEI=7 in the year 1815. But it only did drop the temperature around 0.4 to 0.7C (called Year Without Summer). A temperature drop of 3C would create glaciers in Europe all year round. Even Laki eruption in the year in 1783 did not cool the northern hemisphere down to 3C. That amount of drop in temperature would equal a new ice-age in Iceland, Europe and North-America.

The last eruption in Grímsfjall volcano (May, year 2011) did not have this effects. But was at least VEI=4 in size. But that eruption was many times larger then the eruption in Eyjafjallajökull volcano in the year 2010. So facts do not support the claim this news from The Telegraph is making.

This claims, among others in this types of news is nothing but fear mongering news. It is meant to scare people. Why, it is my guess that it about news paper sales.

Scary News from The Telegraph

Iceland volcano: and you thought the last eruption was bad…

Posted on

Great earthquakes off Sumatra

This morning a earthquake swarm started off coast of Sumatra. This earthquake swarm has had two great earthquakes. But that is earthquakes that are larger then Mw8.0 in magnitude. The first earthquake had the magnitude Mw8.6 at least and took place at 08:36 UTC. At 10:43 UTC there was an earthquake the magnitude of Mw8.1 at least. There have been many other smaller earthquakes taking place currently. Tsunami warning has been issued for the whole area due to this earthquakes.

Information can get found at EMSC or USGS.

Posted on

Few earthquakes in Hamarinn volcano and Kverkfjöll volcano

After several weeks of quiet period, activity in the volcanoes that are close to or in Vatnajökull glacier. During the past few days there have been earthquakes in several volcanoes in Vatnajökull volcano. Today it is the Hamarinn volcano and Kverkfjöll volcano.

Hamarinn volcano (Loki-Fögrufjöll)

Hamarinn volcano had its first eruption in July 2011. This eruption was small and started without even a hit of earthquake activity. It created a glacier flood that topped at 2100 M3. It did not create any damge. But it filled a human made lake that is used for power production in this area. That eruption was short, it only lasted for about 24 hours, maybe even less. Today this area of Hamarinn volcano has been having minor earthquake swarm. But this does not mean it is going to erupt again. But it also shows that current activity in Hamarinn volcano is not over.


Earthquake activity in Hamarinn volcano today (08.04.2012). Copyright of this picture belongs to Iceland Meteorological Office.


The earthquakes seen on Skrokkalda SIL station. The earthquakes from Tungnafellsjökull volcano are also clear on this tremor plot from Iceland Meteorological Office. Copyright of this picture belongs to Iceland Meteorological Office.

Kverkfjöll volcano

Kverkfjöll volcano have been warning up to a eruption for some time now. When they might erupt is impossible to know at current time. But it is save to say that at present time, no eruption is going to take place any time soon. This however means that earthquakes are increasing in Kverkfjöll volcano. Most of the time there are just small earthquake swarms in Kverkfjöll volcano. No other changes have so far been noticed in Kverkfjöll volcano. But that is unlike what has been taking place in Askja volcano in the past few weeks.


Earthquake activity in Kverkfjöll volcano. This are just small earthquakes so far. Copyright of this picture belongs to Iceland Meteorological Office.


The tremor plot from the SIL station that is closest to Kverkfjöll volcano. It just barely shows the earthquakes that have been taking place in Kverkfjöll volcano. Copyright of this picture belongs to Iceland Meteorological Office.

After several weeks of quiet in Iceland it seems to be that the quiet period is over. But if it is going to going to result in any major activity is impossible to know at this point.


Volcanoes of Iceland. Copyright unknown, Google Inc. But the picture is from here (warning! Conspiracy web site.)

Posted on

Look at Tungnafellsjökull volcano earthquake swarm

Here is a quick look at the earthquake swarm in Tungnafellsjökull volcano this morning. This earthquake swarm is interesting, as it started with few earthquakes at the depth of around 10 km. This suggests that magma might be pushing up to the volcano at depth now. So far this is not any high volume in my option, at least not enough to start an eruption now. But if this progress continues, it is going to end with an eruption one day. But when and how big is impossible to know at current time. for the moment the earthquakes have stopped. But it is my opinion that this a dike intrusion, not tectonic earthquakes. This can be seen how the earthquakes line them self up from 12.6 km depth and up to 3.6 km depth in almost straight line based on there location.


The earthquake swarm in Tungnafellsjökull volcano. Copyright of this picture belongs to Iceland Meteorological Office.

The earthquake swarm is dense, but that suggests an magma dike intrusion from deep within the volcano. Similar earthquakes have been seen in other volcanoes, like Esjufjöll, Askja, Katla so few are mentioned. So I know this pattern when I see it.


The earthquake pattern as it did appear on Skrokkalda SIL station. The tremor chart shows that the earthquakes where high-frequency earthquakes for most part. Something like that was seen in Eyjafjallajökull volcano before it erupted (it had earthquakes like that many years before it erupted, not just few weeks before). Copyright of this picture belongs to Iceland Meteorological Office.

I did record the largest earthquake on my geophone at Hvammstangi and at Heklubyggð. Based on that trace, the earthquake was noisy. Given me even more clues that support my suggestion that the earthquake swarm was due to dike intrusion.

Similar dike intrusion events are now taking place in Kverkfjöll volcano. But I am going to write about that tomorrow. But earthquakes in Kverkfjöll volcano have been taking place for several years now, with short and long breaks between earthquake swarms.