The breakup of this ice dam would send a violent wall of water, ice and debris down the river valley causing massive flooding and sometimes devastation to local settlers' properties. The jökulhlaup occurred annually until it ceased in 1967 due to glacial recession, thought to be associated with the massive Good Friday earthquake of 1964.
The disintegration of this ice dam would trigger a powerful flood and damage to local settlers' property. The jökulhlaup was an annual occurrence until it stopped in 1967 due to glacial shrinkage, thought to be connected to the massive Good Friday earthquake of 1964.