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Iceland │ Hrútagjárdyngja Volcano field │ Reykjanes │ Part 50
2022-03-23
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* * * Hrútagjárdyngja is one of the largest lava shields in Reykjanes. * * *
On the north side of Sveifluháls, about 2 km west of Vatnsskarð, are the sources of a dyngja called Hrútagjárdyngja. It derives its name from a ravine that surrounds the crater area. This is a unique formation that is worth looking at.
Hrútagjárdyngja's crater area is a lava plain with gaping cracks in three ways.
The crater itself is irregular with 10-14 m high, steep crater edges. The crater is open to the south and the lava has mainly flowed in that direction.
A cauldron about 10 m deep is a short distance northwest of the main crater. Towards the end of the eruption, magma has penetrated under the crater area and swelled it up, forming a lava bulge (lava-filled pile). It has been up to 30 m high. It is clear that the surface of the lava has solidified when the magma began to lift it. Later, the magma has expanded through lava channels or sunk into the eruption channel and the surface of the lava bulge then sank.
A fissure has formed around the crater area (on the west side it is called Hrútagjá) and it takes on its current form. A long time later, an eruption fissure has opened up in the crater area of Hrútagjárdyngja, leaving a considerable amount of lava.
Hrútagjárdyngja is one of the largest lava shields in Reykjanes.
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