Tilkynning um breytingu á litakóða eldfjalls

Reykjanes

Tími: 26. feb. 2020, 10:53

Litakóði:  Grænn 

Númer eldfjalls: 371020

Virkniyfirlit:
On the 25th of February geoscientists joined a Scientific Advisory Board meeting and reviewed the current status of the unrest at Mt. Thorbjörn that started in late January this year in the Reykjanes peninsula. Last week, gas measurements were performed in the Eldvörp area and they revealed dangerous depletion of oxygen concentration within a lava cave. In general, it is considered dangerous to enter in lava caves within geothermal areas and people are asked to be very cautious when approaching such places. It is unclear if these unsafe conditions are new or not, since gas measurements prior to the unrest do not exist. In the last days the seismic activity in Þorbjörn has decreased significantly. GPS and InSAR data do not show on-going inflation in the area, suggesting that for now the magma inflow has stopped. There are indications of a small deflation signal from mid-February, but the scientists consider it too early for a proper interpretation. In light of this, it is considered very important to continue to monitor the area closely. The Icelandic Meteorological Office decided to move the Aviation Color Code for Reykjanes back to Green as an eruption, potentially impacting the aviation, is considered less likely. The monitoring network in the area has been improved over the last weeks and this will allow the IMO to quickly detect changes occurring in the volcanic system that might indicate an increase in the activity. The Uncertainty level issued by the Civil Protection on the 26th of January is still in force. The next Scientific Advisory Board meeting will be on the 12th of March. The meeting was attended by scientists from the Icelandic Meteorological Office, the Institute of Earth Sciences at the University, together with representatives from the Civil Protection Department of the National Commissioner of Police, HS-Orka, ISAVIA and the Environment Agency.

Hæð gosmökkvar:
No eruption ongoing

Aðrar upplýsingar um gosmökk:
No eruption ongoing

Nánar um vá:
The inflation occurred on plate boundaries and within the volcanic system of Svartsengi which is either considered a separate system or part of the Reykjanes volcanic system. The last known eruption was during Reykjanes fires, which occurred between 1210-1240 AD. Within that period a several eruptions occurred within that system, thereof there were three eruptions in Svartsengi system. The eruptions were effusive (non-explosive) fissure eruptions erupting on 1-10 km long fissures. No explosive eruptions are known from this system. The largest eruption in the swarm, from 13th century, formed Arnarseturshraun lava (estimated 0,3 km3 and 20 km2). The duration of these eruptions are usually from a few days up to several weeks. Seismic activity is very common in this area and is linked to the plate boundaries, geothermal activity and possible magma intrusions. The largest earthquakes measured in this area are about M5.5. For more information please check the Catalogue of Icelandic volcanoes at http://icelandicvolcanoes.is/?volcano=REY.




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