In total, the volume of lava and tephra emitted during the five-month eruption was estimated to be about 0.25 of a cubic kilometre (0.06 of a cubic mile). About of new land was added to the island, increasing its pre-eruption area by some 20%. In the end, the harbour entrance was narrowed considerably but not closed off, and the new lava flow acted as a breakwater, improving the shelter afforded by the harbour. Flakkarinn rafted several hundred metres towards the harbour along the top of the lava flow, but came to a halt well away from the water's edge.