Category: Dyke intrusions

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Random minor eruptions in El Hierro volcano

It seems that the main eruption is over in El Hierro volcano, for now anyway. For the moment there are minor eruptions taking place in El Hierro volcano. This minor eruptions happen at random times and between them nothing is happening. This is clear by the harmonic tremor data from the sensors that are on the El Hierro Island it self.

This type of behavior is not a big surprise. I fully expected this to happen when this eruption started. The main risk now is that new vents might open up in new places without any warning at all. This seems to have already have happened to some extend. As I have been getting unconfirmed reports that new vents have opened up in this new eruption episodes that have only lasted for few hours. So far this new vents have not opened up on land. But this pattern of eruption increases the risk of that significantly. As magma appears to looking for a way out. But does not find the way out that last, or does not have the pressure to maintain an new vent open for long period of time. The vent that erupted the longest is estimated to be around 125 meter below the surface. So it has been guessed that its above 750 meters high (this is unconfirmed).


Harmonic tremor and lows in El Hierro volcano today. Copyright of this picture belongs to IGN (Instituto Geográfico Nacional).


The harmonic tremor activity yesterday (23.01.2012). As can be seen the activity starts, then stops again. This means that new vents are opening up again. Or that the older vents are opening up and starting to erupt again before stopping. Copyright of this picture belongs to IGN (Instituto Geográfico Nacional).


The activity on 22.01.2012. This as same in the past two days. Activity start before stopping again. Copyright of this picture belongs to IGN (Instituto Geográfico Nacional).

As for what happens in El Hierro volcano in the next weeks to months. It is close to impossible to know for sure what happens. As what happens next depends on the magma flowing into El Hierro volcano. It seems that this eruption is not over. Even if it continues with short breaks between eruption events.


Picture of the activity today (24.01.2012). I got this picture by email. Click on the picture for full size. Copyright holder of this picture wish to remain anonymous. Used with permission.

This picture clearly shows the active area today. There is also an highly active hydro-thermal area where the eruption took place, or have been taking place. There is also some chance of dike intrusions in this area creating new hydro-thermal areas. But dike intrusions can take place without any earthquake activity. If there is an earthquake activity, it does not need to have high amount of earthquake activity. Harmonic tremor can and often increases if an dike intrusion is taking place.

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El Hierro volcano eruptions ends (again)

Based on the harmonic tremor data in the past few hours it seems that the eruption in El Hierro volcano has ended again. How long or if the eruption has really ended now is impossible to know at the moment. However it is clear based on the tremor activity that all eruption activity has ended and it did so suddenly and after sharp increase in activity several hours before that.


The activity in El Hierro volcano today. Notice the spikes when the eruption suddenly gains energy and how fast it dies out based on the tremor data. Copyright of this image belongs to IGN (Instituto Geográfico Nacional).

Even if the eruption has ended. For the moment anyway. The area where the eruption took place is going to have hydro thermal activity for several months to comes, and up to many years if there are any shallow dike intrusions in the base of El Hierro volcano (and Island). I do not yet know if the eruption has ended, or if this is just an brake in the current eruption cycle. But next few hours to days are going to make it clear if this is an break or not. But I would not be surprised if the eruption started again at the same location, or an new one. As this is shield volcano and there eruption pattern often have breaks in them for shorter and longer periods of time.

Update 1: It has been sad that the graph has once again been re-scaled. To what size I do not know for sure. But in an comment on Facebook it was sad to be around -36dB. If that is the case. I am wrongly interpreting the data. Because of that. I have no idea what is going on in El Hierro volcano at the moment.

Update 2: It seems that activity has renewed again in El Hierro volcano. It started around 04:06 UTC and lasted until around 10:00 UTC. Then it started again at 16:00 UTC and is currently ongoing. This is now an eruption that happens in episodes. That means there are going to be longer and shorter breaks between eruptions in El Hierro volcano.


Activity in El Hierro volcano today. The increase in harmonic tremor marks the start of new eruption in El Hierro volcano. Copyright of this image belongs to IGN (Instituto Geográfico Nacional).

Blog post updated at 00:50 UTC on 20.01.2012.
Blog post updated at 19:31 UTC on 20.01.2012.

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Minor magma dike intrusion into Upptyppingar tuff mountain

Yesterday (12.01.2012) there was an minor earthquake swarm in Upptyppingar tuff mountain. But they are inside Kverkfjöll volcano fissure swarm that extends several km away from the main volcano. The largest earthquake in this earthquake swarm was around ML2.0 in size, with the depth of 14.4 km. But this was also the deepest earthquake in this earthquake swarm. But most of the earthquakes had the depth of 14.4 km and up to 7.8 km. So I am sure that this was magma, rather then tectonic movements that did create this small earthquake swarm.


The earthquake activity in Upptyppingar tuff mountains. Copyright of this picture belongs to Icelandic Meteorological Office.

This might mean that there is more activity on the way in Upptyppingar tuff mountain. As this suggests that new magma has started to flow into the magma sill that has formed under the Upptyppingar tuff mountains. It is hard to know or if there is going to be an eruption there. But I find it most likely going to be the case. But it might well be good 10 to 20 years into the future until an eruption happens in that spot. But activity started in this area in the year 2007, so there already have been good 5 years since activity started in Upptyppingar tuff mountain. For the moment however, it is all wait and see and earthquakes.

Special donation help wanted!

I want to do something for my mom and dad. How are not the most technical people in the world. The fact is that where they live there is no mobile signal inside the house, but it is good out side the house. This can be fixed with an GSM repeater. But that costs money. Around 47.000 ISK, 2.189 DKK, 244 GBP, 294€, $372. I am going to get permission from the mobile companies and the authorities in Iceland to setup this minor repeater in the licensed spectrum (900Mhz). I want to do this. But I currently do not have the money to do this at present time. That is why I am asking for donation so I can do this. But I want to buy them the smallest GSM repeater that is possible to buy in Iceland, just so that they can get GSM signal inside the house.

Thanks for the support. 🙂

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New magma injection into El Hierro volcano

Based on the earthquake activity in El Hierro volcano it seems that new magma injection has taken place, or is taking place at current time in El Hierro volcano.

This new magma injection into El Hierro volcano has already been followed by stronger harmonic tremors and more activity on the surface. As should have been expected when this happens. It is impossible to know at the moment how large and how long this new magma injection is going to last. But while it is ongoing, more eruption activity should be expected from El Hierro volcano. So far nothing suggests that new vents are about to open up in El Hierro volcano at the moment.

Other then this renewed activity. Nothing else has been happening in El Hierro volcano. There have been some news reports (in Spanish, use Google Translate to read) about new thermal anomalies in El Hierro volcano. This might just be hydro-thermal activity following dike intrusions at shallow depth.

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New earthquake activity in Upptyppingar tuff mountains

During last week and on 5. January 2012 there where few earthquakes in the Upptyppingar tuff mountains. This mountains are not volcano by definition (yet anyway). But since the year 2007 there has been magma intrusion into that area. This magma intrusion however stopped and has been stopped for several years now. But that might be about to change. As on 5 January 2012 there where few small earthquakes with the depth of 12 km. Last eruption that took place in the Upptyppingar tuff mountain area where about 12.000 years ago, around the end of the last ice age. Considerable deformation has taken place in the crust in Upptyppingar tuff mountain since magma started to build up there. Current earthquake activity in Upptyppingar tuff mountain is not high at the moment however. But it has remained rather constant for the past 7 to 10 weeks at least. But due to lack of SIL stations in the area, it is hard to know how many earthquakes have exactly been taking place there at the moment.

Upptyppingar tuff mountains are part of Kverkfjöll volcano system. This new magma into Upptyppingar tuff mountains suggests that Kverkfjöll volcano might be about to enter an new time of activity. But they have been dormant since the year 1968 at least. But Kverkfjöll volcano have also been seeing some earthquake activity on its own.

It is most likely is the case that we are going to see eruption taking place in Upptyppingar tuff mountain one day. But the wait for it might be long however.

A research papers into the activity in Upptyppingar tuff mountain.

Resarch #1 (pdf file)
Research #2 (pdf file)

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Renewed eruption activity in El Hierro volcano

Since yesterday there has been an renewed eruption activity in El Hierro volcano. Harmonic tremor has not seen big increase however. This suggest that this new eruption so far is small and mot procuring a lot of lava to the surface. Some floating pyroclastic has been spotted on web cameras and by local people when they come up to the surface. This eruption activity appears be intermittent at the moment. Going on and off every few hours to days.


The harmonic tremor from the eruption in El Hierro volcano. Harmonic tremor remains low however, so there is not a lot of energy in this eruption at the moment. Spikes in the tremor chart are most likely explosions taking place in the eruption area. Copyright of this picture belongs to IGN (Instituto Geográfico Nacional).

The eruption appears to have started again following an new dike intrusion from great depth into El Hierro volcano. This was followed by few earthquakes. All of them where small. If more new magma flows into El Hierro volcano this new eruption episode is going to increase in strength and in power. But it is hard to be sure if that is going to happen or not.


Eruption area in El Hierro volcano. This new eruption seems to be closer to the coast line then before. Copyright of this picture belongs to INVOLCAN. Picture is via Eruption blog (Erik Klemetti)

It is impossible to know what happens next in El Hierro volcano. So watching is important thing to do.

Other blogs about this new eruption.

Renewed Activity at El Hierro in the Canary Islands (Wired Science)

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Eruption starts again then stops again in El Hierro volcano

Few weeks ago the eruption in El Hierro volcano stopped for few hours. Before it did restart at lower levels for few days. Then it stopped again. This type of behavior is not so unexpected as it seems that El Hierro volcano did get some minor magma injection in past few days and around the time the eruption did restart. But this injection of new magma was followed by minor earthquake swarm in El Hierro volcano, with one of the earthquake having the depth of 34 km (automatic depth estimate I think). But this new injections of magma seems to be small compared to the amount of magma that has already been injected into and erupted already in El Hierro volcano.


Harmonic tremor yesterday (03-01-2012) in El Hierro volcano. Copyright of this picture belongs to IGN (Instituto Geográfico Nacional).


Harmonic tremor today (04-01-2012) in El Hierro volcano. Copyright of this picture belongs to IGN (Instituto Geográfico Nacional).

Current level of harmonic tremor in El Hierro volcano suggests an small eruption in the area. But there is now an highly active hydro-thermal area where the eruption started and has been taking place for the past three months. But it is going to take several weeks and up to years for this area to cool down. Then there is also the chance of hydro-thermal activity in the area if there is an dike intrusion into the rock of the El Hierro volcano that has not erupted. If that is the case as might well be. It is going to decades and up to hundreds of years to cool down.

For the moment however the main eruption event in El Hierro volcano is over and it is going to remain like that until new magma is injected into volcano. But that might not happen for hundreds to thousands of years if the current sequence of events that led to current eruption is over. But only time is going to tell us what happens next is El Hierro volcano. As volcanoes are unpredictable in there nature.

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Hydrothermal activity in El Hierro volcano

For the moment the eruption in El Hierro volcano has ended. The current harmonic tremor that is being detected might well be from hydrothermal activity that is currently in the area that erupted. But even if the eruption has ended, the area that erupted is going to be warm for many weeks to come. This is going to create hot springs below the sea level, among other ocean phenomena connected to this type of hydrothermal activity.


Harmonic tremor levels remain close to background levels at El Hierro volcano. Taken today at 16:05 UTC. Copyright of this picture belongs to IGN (Instituto Geográfico Nacional).

As for future activity in El Hierro volcano. It is important to remember that eruption activity might start again on a new fissure. But that would be pre-seeded by earthquake activity. After the eruption activity stopped there has been some earthquake activity. But it is not at that level I would expect before a new eruption where about to start in El Hierro volcano. For the moment however things remain quiet in El Hierro volcano. A relieve to the local people in the area I would think.

Other

I want to remind people of the volcano and earthquake forum. It allows for more discussions on volcanoes, earthquakes and other stuff that might not belong to this blog.

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Overview of activity in Iceland, Spain and Canary Islands

This is a overview of activity in Iceland, Spain and Canary Islands. This is just an short overview. So not all events are included. But it has been quiet during the Christmas holidays.

Iceland

During the 24 to 26 of December there was not a lot of earthquake activity in Iceland. Three small earthquake swarm took place in Katla volcano. In Hengill volcano there was one small earthquake swarm in a location where earthquakes swarms have been taking place for past few weeks. In Katla volcano there was a earthquake swarms inside the caldera. This earthquake swarm are an reminding sign of the activity that is currently taking place in Katla volcano. But this activity took place in north-west part of the caldera. Since Sunday the activity in Katla volcano has again dropped for the time being. But that might change at any time. The largest earthquake that happened was an ML2.3 earthquake. It appeared clearly on my geophone at Heklubyggð.

Stormy weather in Iceland has made it difficult to monitor earthquakes during the past days. This is unlikely to change in next few days. As the path of the winter storms appears to be directly over Iceland at the moment.

Other then this. There was general quiet scene in Iceland during this weekend in Iceland.

Spain

During the weekend Spain had many minor earthquakes. With the largest one going up to ML3.5 in size, based on automatic size estimate. I do not know if anyone of this earthquakes where felt by humans. This earthquake activity is normal for Spain.

Canary Islands

The eruption in El Hierro volcano continued as it has been doing for the past three months. No earthquake appeared on the IGN automatic earthquake list. Harmonic tremor remained the same during the weekend. But yesterday and today there have been reports of new fissures opening. But this does not appears to have changed the harmonic tremor levels on the seismographs on El Hierro Island. This suggests that the currently the eruption remains the same. But I do not know what main eruption vents are open at the moment. They might be at great ocean depth and there eruption signs might not appear on the surface of the ocean.

Other then this it has been quiet in Canary Islands.

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Ongoing earthquake activity in Katla volcano (Week 50)

Yesterday and today there has been some earthquake activity in Katla volcano. While this earthquake activity is less then what have been taking place during the past few months this activity is bit higher then it used to be during the winter times. The largest earthquakes so far have had the magnitude around ML2.0 (from what I can tell). Currently this earthquake activity is limited to three areas inside Katla volcano caldera according to report from Iceland Meteorological Office.


Earthquakes in Katla volcano during the past 48 hours. The ares with most earthquake activity can clearly be seen inside Katla volcano caldera. Copyright of this picture belongs to Iceland Meteorological Office.

This earthquake activity is more then compared to the winters few years back. Here is an comparison from the years 2009 and 2010 in Week 50 (current Week).


Earthquake activity in Katla volcano during Week 50 in the year 2009. Copyright of this picture belongs to Iceland Meteorological Office.


Earthquake activity in Katla volcano during Week 50 in the year 2010. Copyright of this picture belongs to Iceland Meteorological Office.

As can be seen with this comparison, the earthquake activity now in Katla volcano is considerable higher then in what is called an normal year in terms of activity in Katla volcano. What this means is unclear. But this suggests an eruption is not far away in Katla volcano. But when and how big is impossible to know at current time. Many of the earthquake swarms in Katla volcano are due to dike intrusions taking place in the Katla volcano caldera. But not all of them get to the surface to start an eruption. However such activity can and has increased hydro-thermal activity inside Katla volcano caldera. As has been evident during the past few months in Katla volcano caldera.