An eruption started between Sýlingarfell and Hagafell at 10pm. An earthquake swarm started in the magma intrusion north of Grindavík around one hour earlier.Ármann Höskuldsson, a volcanologist, says that the eruption is in the best place in a tricky sequence of fissures. He believes that the fissure might stop extending.Björn Oddson, a geologist, says that the lava isn’t flowing towards Grindavík. He says the eruption is relatively well-positioned.Wind directions have been favourable, says meteorologist Einar Sveinbjörnsson.There's an expectation that volcanic gas might drift eastward, potentially shifting southeastward, over uninhabited areas and out to sea.An Level of Emergency state has been declared by Civil Defence.The fissure of the eruption is about four kilometers long.The lava flow in this eruption is significantly larger compared to recent volcanic eruptions in the Reykjanes Peninsula.The police commissioner in Suðurnes says that no one should be in any physical danger. The most significant risk from the eruption, as it stands, is if changes occur in the fissure.