Seismic activity continued in the area around Bárðarbunga volcano in Vatnajökull glacier yesterday evening and through the night. The largest earthquakes were of magnitude 3.2, occurring at 10:28 pm, 4.1 at 10:52 pm, 3.5 at 11:35 pm, 4.5 at 03:17 am and 3.4 at 06:05 am.
From midnight 13 earthquakes were detected in the Bárðarbunga caldera, about 27 in the northern part of the intrusive dike and around 20 by Herðubreið and Herðubreiðartögl, all below magnitude 2.0, as stated in the Icelandic Met Office’s update this morning.
Geophysicist Magnús Tumi Guðmundsson told ruv.is that according to measurements carried out during yesterday’s surveillance flight, the subsidence in the Bárðarbunga caldera is now 25 meters (82 feet) and is slowing down. “That must be considered to be good news.”
Yesterday, ruv.is reported that the subsidence had been 50 cm (19 inches) per 24 hours on average.
The subsidence is an indication of a possible sub-glacial eruption, which might lead to explosive activity, ash production and flooding in glacial rivers. Magnús stresses that even though a slower subsidence is a good sign, the future scenario remains uncertain.
Magnús added that there are no indications of decreasing volcanic activity in the Holuhraun eruption. However, it appears that the intrusive dike is no longer expanding.