Vertical displacement in the Bárðarbunga caldera
Seismic events 2014 - 2015
The subsidence of the glacier surface above the Bárðarbunga caldera was displayed on an interactive graph (now inactive). These measurements were a cooperation of the University of Iceland, the Icelandic Met Office, the Civil Protection department of the NCIP and the Icelandic Coast Guard, see disclaimer.
The vertical displacement (m) was monitored by near real time presentation of data from a GPS station, mounted in the middle of the caldera. The elevation above sea level, top left, refers to the zero value on the y-axis, while such value top right shows the current position of the station (m a.s.l.).
The upper graph shows the first two weeks, 12 - 25 September 2014. The gray line represents relative displacement and the blue line the median value for 180 minutes. Earthquakes in the area are shown separately below (same x-axis, same timing). Enlarge.
The first two weeks as an example
Total subsidence from 12 Sept 2014 until 1 March 2015
The total subsidence of the glacier surface above the Bárðarbunga caldera since the equipment was mounted on 12 September can be seen below on another graph (enlarge):
Mechanic failure 12-14 October. A short break 8 Nov., processing failure due to connection problems. The apparent rise 11 November, when the station had to be lifted out of snow, has been corrected for. From 23 Nov. to 30 Dec no signal received (the station was out of sight of the relay station in Kverkfjöll). After trial transferral to Vaðalda and then back to Kverkfjöll, a signal was received again but only until 11 Jan 2015. After yet another field trip, signal was received again 6 February. Short discontinuities in February: Repeater at Kverkfjöll causing temporary communication failure.