Eruption on Fimmvörðuháls
An eruption began in Eyjafjallajökull between 22:30 and 23:30 GMT on Saturday evening, March 20th. The eruption fissure is about 0.5 km long and is located on the norhern side of Fimmvörðuháls, east of the Eyjafjallajökull ice cap.
Seismic activity in Eyjafjallajökull has been intensive for the past three weeks and most of the earthquakes have been located between 7 and 10 km depth.
On March 19th a seismic swarm began east of the top crater, originating between 4 and 7 km depth. The activity migrated eastwards and towards the surface on Saturday, March 20th.
At 22:30 GMT a slightly increased tremor was detected on three seismic stations, located within 20 km from the volano's top crater, and within the next two hours reports on an volcanic eruption were received.
The seismic tremor increased steadily until 07:00-08:00 this morning, March 21st, when it reached its first peak but decreased again around 10:00 GMT. A new tremor pulse was seen again an hour later and since then the volcanic tremor has alternately been increasing or decreasing.
No major ashfall has been detected, the ash plume is considered small and has not been detected on IMO's weather radar so far.