Surveying of the subsidence of the Bárðarbunga caldera was done this morning from the civil avaiation aircraft TF-FMS using radar profiling.  The results show that the subsidence, first detected on Friday 5 September, has reached 18,5 m, of which 2,5-3 m occurred over the last three days.  The events in Bárðarbunga can be called a slow caldera collapse.  At this moment the total subsidence is small compared to known caldera collapses elsewhere but it is also impossible to say how long this event will last.