Tilkynning um breytingu á litakóða eldfjalls

Reykjanes

Tími: 15. feb. 2020, 16:05

Litakóði:  Gulur 

Númer eldfjalls: 371020

Virkniyfirlit:
On the 13th of February geoscientists joined a Scientific Advisory Board meeting and reviewed the current status of the unrest at Mt. Thorbjörn in the Reykjanes peninsula. The seismic activity is still present in the area north of the town of Grindavík. Even though the seismicity has been decreasing since the end of January, it is still above the known background level. Two earthquakes larger than M3 have been detected in the area in the past week. The last one, with magnitude M3.1, occurred on Friday morning (14th of February) at 08:26 on the western side of Mt. Thorbjörn. The deformation rate is slightly decreased, but GPS stations still measure on-going crustal movements. In the past week, two more seismometers have been added to the current monitoring network. Gas measurements will be improved in the area and will be done regularly, as there is a general consensus that the area still needs a high level of monitoring. The next meeting of the Scientific Advisory Board will be held after a week, if no changes occur. The meeting was attended by scientists from the Icelandic Meteorological Office, the Institute of Earth Sciences at the University and ÍSOR, together with representatives from the Civil Protection Department of the National Commissioner of Police, HS-Orka, and the Environment Agency.

Hæð gosmökkvar:
No eruption ongoing

Aðrar upplýsingar um gosmökk:
No eruption ongoing

Nánar um vá:
The inflation is occurring 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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