The eruption at Fimmvörðurháls began at night of March 20, 2010 and stood for three weeks til April 13. This was what Icelanders call a tourist eruption, as everyone turned in a tourist and wanted to see this spectacular show from a short distance, hiking, driving an off-road car, riding a snowmobile or taking a helicopter flight.
Two fissueres opened in a narrow mountain pass in between two glaciers, Eyjafjallajökull and Mýrdalsjökull. The two craters - new mountains were given names Magni ("Strong") and Móði ("Angri") and the lava flowing from them Goðahraun ("The lava of old Norse Gods"), following the tradition of using names from old Norse mythology in this area (e.g. Þórsmörk, Goðaland).
"Magni and Móði, the sons of Thor, did not have many worshippers, as was common for sons and daughters of the major gods and goddesses. They did have a few, though, for the following reasons: Magni was considered the god of might, or strength, and was believed to be the only being in the Norse universe stronger than his father. His worshippers praised great strength and feats thereof. Magni was supposedly the only one besides Thor able to lift Mjölnir, Thor's hammer. Modi was the god of battle wrath. His worshippers were the archetypal berseks, some relying on drugs of various kinds to enhance their wrath and stifle fear. It is believed that some of his followers also worshipped Sif for her skill in battle."
(ref. http://www.pantheon.org/articles/m/magni_and_modi.html)
As in summer 2014, you can still find warm lava in this area. Here you have a unique chance to walk on very new piece of land, where only few people have been before you.
The Goðahraun lava could be accessed on food either from south - Skógafoss waterfall or from north - Básar in Goðaland. The Fimmvörðurháls trail is a famous and very popular hike, however it can be very challenging with almost 1.000 m (over 3,000ft) elevation gained and extending 20 km (12 miles). The weather conditions can change very quickly and snow storms occur even in high summer there. For that reasons, please, study the weather forecast well before heading on the trail and always carry enough supplies and warm, water- and windproof clothes.