Tilkynning um breytingu á litakóða eldfjalls


Tími: 07. feb. 2020, 11:08

Litakóði:  Gulur 

Númer eldfjalls: 371020

On the 6th 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 data collected over the past week (including those measured by the recently installed stations) were reviewed. The new results suggest that the magma body is located at a depth of 3-5km, whereas it was previously estimated to be at 3-9km. There are indications of changing patterns in the crustal movements. The earthquake activity has decreased over the past two days, but there are still signs of a continuing inflation. Until now, the maximum deformation observed from the GPS stations is about 5 centimeters. Similar volcanic crises in the country suggest that this might be a long-term event, for which changes can occur week after week without the possibility to anticipate with certainty if the activity is resolved. During the meeting, possible scenarios that could be triggered in the event of an eruption have been also considered. In the coming days, it will be assessed whether it is necessary to increase the number of monitoring stations in order to improve the capability to follow the evolution of the events. 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, the Environment Agency, ISAVIA and the Police of the Suðurnes.

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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