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Connection between Tungnafellsjökull and Bárðarbunga volcanic sites

It has been noticed that rifts have opened up in the area of Tungnafellsjökull. At the same time, Bárðarbunga has been quite active. According to the layout of the grid of Munroe lines feeding the volcanoes, it looks likely that magma actually flows from the line through Tungnafellsjökull into the magma chamber under the caldera of Bárðarbunga. The flow would follow this arrow:

Tungnafellsjökull - Bárðarbunga

The magma did flow a long way until the eruption of 2014 in Holuhraun started. As shown in former blog post:

Bárðarbunga magma trail

 

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The Caribbean twins

Of course no one can answer this properly. The similarities are countless and both areas are formed due to the formation of the Atlantic Ocean. The island arches forming at the eastern margin are arranged similarly. The area marked on the map below is very well known as the Caribbean Sea.S-Ameríka - Skil norðan við

But south of S-America is a less known ocean:

S-Ameríka - Skil sunnan við

These two areas, somehow inserted into the Atlantic Ocean, are strikingly similar. The settings are comparable, at the outreaching ends of N-America, S-America and Antarctica, so we can have some kind of feeling for why the similarity occurs. One of many magic wonders!

So what does this tell us? The fact that this degree of similarity can occur, aligned exactly the same way compared to NS and EW axis, the interplay of tectonic drift and rotation of the Earth has to be very similar. Those traveling through S-America might also be interested in this. At least, if this kind of similarity would be found north and south of Iceland people would mention it. S-America is big enough to somehow keep this out of sight.

 

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Hidden eruptions under the glaciers

During this decade, a few volcanic eruptions have been recorded under a glacier without breaking through the ice. It has occurred twice under Mýrdalsjökull in South Iceland, both in the year 2000 and 2011. These eruptions are comparatively small and last for a short time. The effect is usually limited to a flood, and in 2000 the bridge over Jökulsá River withstood the extra flow. On the contrary, the flood of 2011 took the bridge over Múlakvísl River.

The floods find their way under a glacier tongue, and this is a picture taken on the middle of Sólheimajökull where the flood of 2000 took place.

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On the top, black basaltic sand and volcanic ash covers parts of the ice. The river Jökulsá flows peacefully down below.

Sólheimajökull og Kötlujökull - flóð

The location of those two floods / eruptions are roughly pointed out on this map from Náttúrfræðistofnun of Iceland, with the convection cell grid added.

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Where is the central point of Iceland?

Knowing the position of convection rolls under Iceland, geological analysis becomes much easier. For our curiosity, we can examine the central points and find out which one is most central.

Centers of Iceland

A few candidates appear. The Reykjanes Ridge has a central role for the Atlantic Ocean, but when it comes to Iceland the activity is transferred to the east. The large lower mantle convection rolls form a line from SW to NE under Hveragerði, and the relevant continuation of the circular path does also pass under Hveragerði, making it looking very centrally located. Still, the central role of the minipolygon near Hveravellir is exactly equadistance between Snæfell and Snæfellsjökull on the same latitude, and on the same longitude as Hekla and Eyjafjallajökull, giving it a special central role. The north part of the larger polygon is found to be the center of the Icelandic shelf, forming a surprisingly correct ellipse around the country.  Katla is a candidate for being most central compared to the tectonic drift vectors as measured with GPS technology.

Although the idea about hot spot is somehow challenged here, it can be mentioned that usually the hot spot of Iceland is thought to be underneath the western part of Vatnajökull Glacier. It really is a special area, where for instance Bárðarbunga has obviously a special role regarding forming dikes within the rift zone, along with Grímsvötn. The main volcanic zones connect there, so it plays a very central role.

For further reference:

Drangey 01Katla 01Landgrunnid - sporaskja

Lines of convection system - Iceland

A few different versions of central points 🙂

 

 

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Hawaii and Iceland – mathematics show how they are connected

The two obvious volcanic spots of the globe, Hawaii and Iceland, are located on two of the main upwelling lines between convection rolls of the lower mantle.

Hawaii - Iceland

On these small drawings it is pointed out how polygons along the main division lines are regarded as the center of the hot spots. Actually, the hot spots have to be understood by referring to the relevant division line between convection rolls.

Here it is shown that the lines of Hawaii and Iceland are exactly 120° apart.

The reason for the arch-like shape of the convection rolls is that moving objects can not flow directly on the rotating Earth. A moving particle travels along a circular path, as can be seen on weather maps. Now, when the mathematics of the relevant path of mantle currents are known, geology will never be the same again.

Actually, it has been noticed that compared with Earth’s center, Hawaii and Iceland form 90° angle.

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The bread baked on the upwelling line at Laugarvatn

On the division line between the N-American plate and the Eurasian plate lies the lake Laugarvatn in Southern Iceland. Baking bread in the sand at the side of the lake is an old tradition.

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The bread has been in the boiling hot sand for 24 hours and is now fully baked.

The geothermal area is quite powerful. Look at the “border line” between the plates:

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Clearly, this natural bakery is no usual place.

Íslandskort - grind

The “border line” with Laugarvatn.