In the evening of 21 July 2014, a large rockslide occurred in Askja, which descended into the caldera lake (Lake Öskjuvatn). It is one of the largest known rockslides since the settlement of Iceland. The slide covered most of the Suðurbotnahraun lava field and it reached the Kvíslahraun lava, but the eruptive fissure of the Suðurbotnahraun lava is beside the rockslide and therefore intact. The slide triggered a tsunami in the lake that washed up on the lakeshores all around the lake, reaching up to 20–30 m elevation above the water level and even higher in places.