Month: December 2011

Posted on

Harmonic tremor in El Hierro volcano drops

There was a change in the eruption in El Hierro volcano last night. The harmonic tremor started to drop of slowly. This drop in harmonic tremor comes several days after a drop in earthquake activity happened. But it might be possible that this drop in earthquake activity in north El Hierro volcano might be because a erupting vent did open up in north El Hierro volcano. But at such depth that the eruption was not noticed on the surface on the ocean. At least that might be the reason. But without any data, this is just a speculation. But at any rate, the earthquake activity in north part of El Hierro volcano has dropped down to almost zero in few days time.


The harmonic tremor yesterday (5 December, 2011). The drop in harmonic tremor can clearly be seen here. Copyright of this picture belongs to IGN (Instituto Geográfico Nacional).


The harmonic tremor today at 08:15 UTC. The harmonic tremor continues to drop during the past few hours. Copyright of this picture belongs to IGN (Instituto Geográfico Nacional).

The harmonic tremor drop is something that has happened before in El Hierro volcano. Just before a new fissure did open up in El Hierro volcano eruption. I am unsure if that is the case now. But it should become clear in about two to three days. But it is also a possibility that this eruption is coming to a end. But it has been erupting now for close to three months now. So this eruption might just ending. But we might have to wait a bit until that is confirmed. But at the moment the harmonic tremor is dropping and that means the eruption is smaller for the moment.

Posted on

Harmonic tremor pulse in Grímsfjall volcano

There have only been seven months since (May 2011) the last eruption in Grímsfjall volcano. But it seems that Grímsfjall volcano is getting ready for its next eruption. Even if the last eruption was the largest one for at least 140 years in Grímsfjall volcano. So far earthquake activity remains low in Grímfjall volcano. But I am not sure if that means anything for the moment. But there has been in earlier lead up to a eruption a build up of earthquake activity in Grímsfjall volcano.

Today at least two harmonic tremors spikes have been detected by IMO. But this type of harmonic tremor pulse have been detected before in Grímsfjall volcano. Older blog posts on that subject can be found here and here. But this time around it seems that the harmonic tremor is stronger then before. Currently it remains uncertain of there is a glacier flood starting from Grímsvötn lake, as was the case last time this type of harmonic tremor pulse was detected in Grímsfjall volcano.


Harmonic tremor in Grímsfjall volcano at 00:21 UTC on 5 December, 2011. Copyright to this picture belongs to Iceland Met Office.


The harmonic tremor in Grímsfjall volcano at 01:39 UTC on 5 December, 2011. Copyright to this picture belongs to Iceland Met Office.

There is a clear change in the harmonic tremor, as can be seen here. But why and what this actually means for Grímsfjall volcano I am not sure. But I am rather sure that this means a new eruption might only be several months away. But it is hard to know that for sure. But I am just base my estimate on earlier experience with Grímsfjall volcano. But it might not mean anything after last eruption.


The GPS data from top of Grímsfjall volcano. The data is missing for the last few days. Must be because of snow and ice. But given the last data set, the change so far it not that great since the eruption last spring. Copyright to this picture belongs to Iceland Met Office.

What happens next in Grímsfjall volcano is a big question. But it seems that Grímsfjall volcano is going to go for a new eruption. When that might happen I have no idea.

Posted on

New media hype over Katla volcano

There apparently is a new media hype over Katla volcano in the British press. This time around it is from BBC News. The news in question claims that a eruption in Katla volcano is going to have a global impact. This is nothing but a exaggeration in my view. While a eruption in Katla volcano might be big, there effects are mostly localized to Iceland. This was clear during the Grímsfjall volcano eruption in May of 2011. Where the global effect was close to zero, there where some flight disruptions. But they where not something major like did happen during Eyjafjalljökull volcano eruption. So the media is overestimating the effects of eruption in Katla volcano. To what end I do not know. But it sure annoyed me, and the scientists that monitor volcanoes in Iceland.

It is also important fact that Katla volcano did have an eruption this year. It took place on 8 and 9th July, 2011. With a smaller eruption on the 10th of July, 2011. This eruption was however a small one and did only melt the glacier, as it was not strong enough to break trough the ice. My coverage of those events can be found here (the whole timeline of events can be viewed here).

In terms of effects of a large eruption in Katla volcano. One thing is clear. It is mostly going to local to Iceland, it might disrupt flights in Europe of the wind systems are unfavorable. Both over mainland Europe or for transatlantic flights. But transatlantic flight can in most case route around the ash clod if it they need to. But the claim for global effects are just exaggeration and nothing else.

The BBC News hype.

New Icelandic volcano eruption could have global impact

Posted on

Growing earthquake swarm in Krísuvík volcano

There seems to be a growing earthquake swarm in Krísuvík volcano on the Reykjanes peninsula. The strongest earthquake so far is a ML2.2 according to the automatic size estimate. Some ghost earthquakes appear to be outside a town called Akranes and Reykjavík to the north. But that are earthquakes that are in fact nothing but errors. This earthquake swarm is tectonic in nature, not volcanic. So there is not going to be a eruption in Krísuvík volcano from what I can tell at current moment.


The earthquake swarm in Krísuvík volcano. Copyright of this picture belongs to Iceland Met Office.

It is hard to know how this earthquake swarm is going to develop. But this earthquake swarm looks growing. For that it is going to peak in activity sometimes in the next few hours. But when exactly is hard to know for sure. I am going to update this blog post if something major happens. The strongest earthquakes appears on my geophone and can be viewed here.

Posted on

Earthquake swarm 14 km to the east of Akureyri town

At 19:22 UTC a small earthquake swarm started 14 km east of Akureyri town. The earthquake swarm started with a earthquake with the size of ML3.11 at the depth of 9 km. The area of activity is unusual, but there are none known fault lines in this area that I am aware of. This area is also a bit off TFZ fault zone. This area normally does not have any earthquakes. I am not sure yet if this are intra-plate earthquakes or not, as this area is close to the NVZ (North Volcanic Zone).

This earthquake was felt in Akureyri town by the local people. How well I do not know.


The area where the earthquake swarm is taking place. Copyright of this picture belongs to Iceland Met Office.

I did record the strongest earthquake on enough geophone to be able to make a plot map from my own software from software called WinQuake that I use to plot earthquakes time, location and depth information with data from Iceland Meteorological Office.


Here is the earthquake location according to my geophones with location data from IMO. This picture is released under Creative Commons licence. See top bar for more information.

Here are the wave form data that where recorded on my geophones (they can be viewed online here). The Sauðárkrókur geophone is a testing geophone that I am currently running. But it is going to be turned off now in December.


The earthquake as it was recorded on the Heklubyggð geophone. This picture is released under Creative Commons licence. See top bar for more information.


The earthquake on Hvammstangi geophone. This picture is released under Creative Commons licence. See top bar for more information.


The test geophone at Sauðárkrókur village. This geophone is noisy. This picture is released under Creative Commons licence. See top bar for more information.


The strongest aftershock that I did record on my Hvammstangi geophone. The wave form data on Sauðárkrókur geophone where not good for some reason. So I do not display them here. This picture is released under Creative Commons licence. See top bar for more information.

The wave form outside the earthquake are ocean waves. They are strong now and show clearly on my geophone. So they appear even more clearly on the SIL network as higher tremor levels. But that is nothing that looks like a volcanic harmonic tremor.

As for the earthquake swarm. It is hard to know what it means. But more aftershocks in this area for the next few days are not impossible. As has been seen before in areas that suddenly start to make earthquakes after a long break.

Icelandic News reports of this event. Please use Google Translate with care. It does not yet understand.

Jarðskjálfti við Akureyri (mbl.is)
Jarðskjálftar við Akureyri (Rúv.is)
Þrír jarðskjálftar nærri Akureyri (Vísir.is)

Blog post updated at 06:02 UTC on 3 December, 2011. Fixing errors in the text.

Posted on

Website news for December 2011

Here are the website news for December 2011.

Name change for the blog in the beginning of January 2012

Since I now cover Spain and Canary Islands. A name change is needed for this blog. That name change is going to take place in the beginning of January 2012. The new name is going to reflect the area that I cover daily in this blog. This change is because I plan to move to Canary Islands (hopefully) in about 10 years time or so.

Changes in advertisement setup

I am going to change the display of the Amazon ads that I have here. Since I try to have ads from most of the language areas in Europe (that Amazon supports) there are many ads and they take a lot of space following it. So instead of using large banners. I am going to replace them with smaller banners or just ads boxes. Google Adsense are going to remain in the same size however as they have been on this blog.

Donations

This blog is free, so are all the information that I put forward here (all that is from me is under CC Licence). For that reason I depend on donations to do my work properly. There is also cost of hosting, living, computer hardware that I have to pay. I am not only living on this blog. But I do have social benefits as I am born with Asperger’s syndrome. Before people start to make a stereotype out of me, I must say that this is really mild version of Asperger’s syndrome that I have. But it has its challenges on times in the people department. But as social welfare goes, it is small amount and when I start to rent apartment again and all that. It is not going to last that long over the month.

My plan also to move back to Denmark have created the situation that I am now saving as much money that I can in order to pay for the moving cost to Denmark (more details later on in this blog post). For that reason I am broke so to speak. Thanks to some great donations last month have eased that pressure somewhat. But I am also trying to save the donations up for the move to Denmark. However, it has proven to be difficult trying to save up money with all the hardware failures that I have been having during the past two months. But that should be more or less over now. I at least hope so. I have only delayed one hardware upgrade until I move to Denmark. That is on my server computer. It needs a hard drive replacement. The hard drive is dying in that computer. But because it is going to be turned off after two weeks and is going to remain offline for the next few months until I move back to Denmark. I figured that it should be in good order (at least I hope so).

During the past two months I have had to replace old hardware that was on its last hours. This has both cut into my savings and told the sad story on how I have been avoiding proper hardware maintenance due to lack of money. To this day I have already lost data (nothing that was not able to get again, for most part) due to lack of replacing old hardware. This all comes down to the reason that I have been really broke for a long time, due to lack of proper income for what I want to do. This blog and my other writer work is a way for me to get out of that cycle of problems. But I am going to work hard on that goal to get off social welfare forever. Since I have grown tired of being poor and not to live my life as I want.

I also want to let people know that with growing geophone network the cost of running such network is going to increase. For the long time now I have been able to have that cost close to zero. But I am not sure for how long I can run it close to cost free. For at least one new geophone station that I am planning and hoping to get up and running in the new year I am going to have to buy a mobile modem (GSM/3G) and subscription (around €10 an month) so I can get data from it. As there is no good other connections in the area. There are going to be at least two geohone network stations like that I plan in coming months.

Geophone network

In December I plan to setup and start two new geophone stations. This geophone stations are going to be located in Eyrarbakki (a small village close to SISZ). The second one is going to be located on a farm named Skeiðflöt, it is located south of Mýrdasljökull but is inside the Katla volcano system that extends a little bit to the south in that area. I am not sure when the geophone stations go up. But it is going to be sometimes after 13 December, 2011. At least I hope so. But this is the plan now and I hope that it holds.

The new geophone stations are going to increase the sensitivity from ML1.9 at Hengill volcano (from Hekla volcano geophone) down to ML0.0 (or about that). For Katla volcano. I am going to be able to record earthquakes down to ML0.0, along with tremor spikes and other stuff like that. For the moment I can barely see earthquakes down to ML1.8 in Katla volcano. Overall, this is going to give me a lot better picture on what is going on in Katla volcano, in real time also.

For the year 2012 I am planning a geophone station at my mom and dad farm. Since now there is a mobile signal that I can use. The cost layout of that would be geophone + computer (I have already bought the computer) + GSM/3G modem and the subscription with that. I am going to post more details on that when the time comes.

Volcanoforum.eu is up and running

The volcanoforum.eu is now up and running. I am still setting up and looking for bugs. But it is ready for people to start registering on it and take part in the discussions. A volcano and earthquake related sections on the forum are going to appear soon. I am not yet done fine tuning the forum. So be patient on that front. But for the most part, it should be working now without any issue at all. At least I hope so.

Moving back to Denmark

In the year 2012 I am going to move back to Denmark. For the moment I am collecting all my money (that I can spare) for the apartment costs, moving cost and all that needs to be paid when I move between countries. I also plan to buy me a new television when I move to Denmark. So I am also collecting for that. For this reason, I am a bit depended on donations for the moment. I not sure yet when I move back to Denmark. But the search for the apartment starts in the early months of the new year of 2012.

Because of that. I do not have any apartment in Iceland and after December I am not going to have any good internet connection. For that reason my main computers are going to be turned off until I can move back to Denmark. This is going to limit me a little bit on what I can work on. But I am going the best I can with this. At least I have my laptop to work on (I should not fail, I hope anyway).

School is finished

I am now finished with school. All that is left are two tests. After that I move from the dorm where I have been living for the past few months. When that is over I move back to my mom and dad until I can get a apartment in Denmark. This all takes few months from start to finish. I do not think that there is anything else to say in this monthly web site news about this blog.

If there is something that I forgot. I am just going to add it later in a update to this blog post.