Bárdarbunga volcano news & activity updates
Bardarbunga volcano update: Eruption just a precursor to a bigger one?
Fri, 29 Aug 2014, 07:1407:14 AM | BY: T
Location of the eruptive fissure this morning (RUV)
An exclusion zone 1.5 km above and 15 km around the eruption site is in place.
View of the eruptive fissure this morning (MILA webcam)
The circumstances around the eruption are somewhat enigmatic. It is interesting to note that the large intrusion, estimated to contain approx. 350 million cu meters of magma on a length of 40 km only produced a tiny fissure eruption (so far, at least).
There are several interesting facts to observe:
- The occurrence of this night's eruption makes it plausible that during the past days there have in facet been one or several similar small eruptions under the ice that went unnoticed except for the observed ice cauldrons.
- It seems that the vertical obstacle between the intrusion and the surface is very strong and that the fissure eruption was only a small "leakage", -otherwise a much stronger eruption would have been expected to occur. In contrast, lateral movement of the magma at depth appears to be relatively easy.
- On the other hand, the propagation of the dyke in the past 48 hours seems to have stopped and has been stagnating under the Holuhraun plain. It was suggested, from earthquake and deformation patterns, that perhaps the magma even started to flow back southwards towards it source.
It is possible to assume that perhaps older dykes from the Askja fissure swarm stopped the northwards movement, caused an accumulation of magma in this area, and a backward flow, along with a small fissure eruption on top.
- It seems fair to assume that this eruption could only the the start of a larger one yet to come, or to a series of similar events, some of which could well occurr under the other sections of the dyke, i.e. under the Vatnajokull ice cap. In that case, the occurrence of jökulhlaups (melt water floods) is a big hazard.
Source: Culture Volcan
Fri, 29 Aug 2014, 05:50
An eruption started in Holuhraun north of Dyngjujökull at around 00:02. Seismic tremor was observed on all seismic stations and the web camera installed in the area by Mila has showed some nice pictures of the eruption. It is a small fissure eruption and at 02:40 AM the activity appears to have decreased. (IMO) read all
Thu, 28 Aug 2014, 13:55
No significant changes have occurred today. ... read all
Thu, 28 Aug 2014, 07:12
Speculations that a small eruption had occurred or still continues at the site of the new ice cauldrons continue. According to an interview with the National Broadcast (RUV), scientists estimate that 30 - 40 million cubic metres of ice have been melted. ... read all
Thu, 28 Aug 2014, 00:44
There are new developments, but uncertain how to interpret the visible signs: ... read all
Wed, 27 Aug 2014, 16:57
Over 800 earthquakes have occurred today so far, mostly now beyond the edge of the Dyngjujökull glacier. The crisis is showing no signs of decreasing. The intrusion itself has migrated about 1 km northwards since yesterday, and approaches the Asjka volcanic complex, which is a worrying development. A magnitude 4 earthquake occurred this morning under the eastern caldera rim of Askja (s. image). ... read all