Day four, mission two. Krafla volcano is not really a volcano at all, although there is a hill with that name in the area. What in fact happens at Krafla is that the ground is pulled from both sides by continental drift. Every 200 years or so, it suddenly gives way about 10 times over a decade or two. Each time it does, vast fissures open up, sometimes over 20 miles long, and lava spurts out along the entire length of them. The last lot of eruptions at Krafla occurred between 1975 and 1984, but geologists believe that the eruptive series is not over. The ground has swollen upwards by about half a metre since the last eruption, indicating a very full magma chamber, two miles beneath the surface. Fearlessly, we set off into the heart of it all.
We first walked around the 320m wide explosion crater known as ‘Viti’, meaning Hell. A lake of very blue water fills the bottom, and it would be very tempting to go swimming, if the sides of the crater weren’t so steep and loose. We had fun starting several mini-landslides by kicking a small stone over the edge.
By the side of Viti are several mud pots. Throughout most of Iceland there is seldom a sign or a barrier to warn visitors about any danger, but here there were warning signs to say that getting too close to the mud pots would be a very bad idea because the crumbling ground might give way. We stood close enough to watch them bubbling and glooping. During the eruptions of 1724-8 in the area, they used to spurt up to 10m high, but now 10cm is about the best they do. They still look nice.
From Viti and the mudpots, we walked through the lava flows from 1984. The centrepiece here is the crater Leirhnjúkur, which is full of startlingly blue, awful-smelling water, which bubbles continuously. Brilliantly coloured mineral deposits fringe the pool, and steam rises from various hot points. The smell was unbearable, and sadly it didn’t deter the midges, so Leirhnjúkur was best appreciated in small doses.
From Leirhnjúkur, we walked through the still-hot lava from 1984. Steam was pouring from cracks in the surface, and occasionally the rocks were warm enough to heat the air into disconcerting patches of sweltering heat. From there, it was a short walk back over some cracked earth back to the car park, from where we could have got a bus back to Mývatn. We, however, fancied a walk back in the sunshine.
It was a good three-hour walk back to the campsite, but the weather and scenery were good. The only other people we saw on the way were two German cyclists. It's a strange thing that almost every German you meet in Iceland is cycling across it, and almost every cyclist you meet is German. As they struggled up a large hill, we detoured via some hot springs at Námafjall. It was warm enough not to need hats and gloves on. Somewhere along the way my hat fell out of my pocket. I hoped that the weather would stay fine for the next three weeks...