Askja volcano: The dyke from Bárðarbunga volcano continues its journey into Askja. It has not yet reached Askja magma chamber. When that is going to happen is unclear at the moment. Activity has been picking up in Askja due to stress changed from the dyke. Bárðarbunga volcano: Dyke activity continues at similar rate as before. It is now moving about 1 – 2 km a day according to latest news. The dyke has reached Askja volcano main system, it has not reached Askja main magma chamber. Once that is breached earthquake activity along with harmonic tremor in Askja is going to trough the roof. Eruption on 23-August-2014 has been confirmed. It only lasted for 1 – 2 hours before it died down. I think current ideas why it happened are wrong. From my perspective it happened due to magma pressure inside Bárðarbunga magma chamber reaching a high point (highest so far). This did mean that the dyke was not able to tap off the magma chamber at fast enough rate for a short while. Allowing magma to breach the crust at other locations. While this was a short event, this suggests that magma is coming into Bárðarbunga magma chamber at depth. So far the volume that is flowing in is low for the moment. I suspect that might change at any time and without any warning. The reason why the ice cauldron did not appear sooner is that it took the water some time to dig its own path trough the glacier. Why it did go to Grímsvötn lake (Grímsfjall volcano) I do not knwo. Earthquake activity remains high in the north end of the dyke. Earthquake activity is present in Bárðarbunga volcano (main volcano), but it is not constant at the moment. That might change without warning. No dyke activity so far going south of Bárðarbunga volcano. Cracks appearing in the crust suggest that the dyke depth is only about 2 km at most. This has also allowed for groundwater warning up in areas. This has been seen under areas were the glacier is thin. This is creating hot springs and hydrothermal areas along the dyke path. Inflation so far is around 40 cm to the east and west. There is nothing to suggest it is going to slow down at the moment. This might be a long eruption. How long I do not know. At most some years, as has happened in Bárðarbunga volcano in the past. Today there has been minor “quiet” time in Bárðrabunga. Harmonic tremor has been stable and no cycle of up and down has taken place. In my view that might change in next hours. I am already seeing changes in the tremor plot that suggest this. jonfr/volcano/?p=4849 Iceland geology blog baering.github.io/ en.vedur.is/
Posted on: Thu, 28 Aug 2014 23:20:36 +0000
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