An effusive fissure eruption began around 1315 on 3 August near the border of the previous lava flow field N of Fagradalsfjall in Meradalir. Deformation models indicated magma was around 1 km below the surface at 1749 on 2 August, according to IMO.Īctivity during 3-21 August 2022. Almost 3,000 earthquakes had been detected by 1527 on 31 July, according to the Norwegian Meteorological Agency’s automatic location system an Mw 5.4 event was detected at 1748. Several of these earthquakes were above an Mw 3, with the largest event of an Mw 4 occurring at 1403. Earthquakes were reportedly felt in SW Iceland, in Reykjanesbær, Grindavík, the Capital region, and as far as Borgarnes. IMO reported an intense earthquake swarm that began around noon on 30 July in an area just NE of the lava field in Geldingadalur, along the dike intrusion that preceded the March-September 2021 eruption. By 7 January, the seismic events had stopped.Īctivity from 30 July 2022-2 August 2022. During 29 December 2021 to 3 January 2022, the number and size of these events had progressively decreased more than 200 events detected during 0000-1535 on 3 January. This seismic swarm continued through 28 December, consisting of more than 19,000 earthquakes about 14 earthquakes were at an Mw 4 or higher. Then, activity markedly intensified at 00300 on 22 December there were 1-10 tremors recorded per minute, totaling to more than 1,400 events by 1047, the largest of which was an Mw 4.9 at 0923. Seismicity increased at 1800 on 21 December 2021 in an area 2-4 km NE of Geldingadalur, which consisted of 18 events. Incandescence from previously emplaced lava flows were occasionally visible at night. IMO also reported that gas emissions were ongoing, though with low concentrations of eruptive gases. The seismic swarm had significantly decreased by mid-October and on 18 October the ACC was lowered to Yellow (the second lowest level on a four-color scale). According to news reports, over 6,000 earthquakes at depths of 5-6 km were recorded by 4 October, the largest event of which was an Mw 3.8. Nighttime incandescence was visible through 4 October, likely from lava flows that continued to advance downslope. The area of the flow field was about 4.85 km 2, and the total volume erupted was 150 million cubic meters, based on 30 September measurements. The Institute of Earth Sciences reported that lava effusion had stopped during the evening of 18 September 2021. This report covers a new eruption period that began on 3 August 2022 using information from the Icelandic Meteorological Office (IMO), the Institute of Earth Sciences, and various satellite data.Īctivity during October 2021-29 July 2022. Several fissure vents opened along a NE-SW trend, accompanied by gas-and-steam emissions, spatter, and lava fountains flows began to fill Geldingadalur and eventually reached the Meradalir valley. The fissure eruption that started in March 2021 in the Geldingadalur (also referred to as Geldingadalir) valley continued until mid-September 2021 (BGVN 46:05 46:10). Although the Fagradalsfjall fissure swarm has previously been considered a split or secondary swarm of the Krýsuvík-Trölladyngja volcanic system, as of September 2022 Icelandic volcanologists managing the Catalogue of Icelandic Volcanoes made the decision to identify Fagradalsfjall as a distinct and separate system. This was the first volcanic activity on the system after about 6,000 years of quiescence. The Fagradalsfjall volcanic system on the Reykjanes Volcanic Zone in Iceland erupted on 19 March 2021, following more than a year of earthquake activity and inflation/deflation periods. New eruption during August 2022 consisted of lava fountains and flows Most Recent Bulletin Report: September 2022 (BGVN 47:09) Cite this Report Sources: Icelandic Meteorological Office (IMO), Icelandic National Broadcasting Service (RUV), Icelandic National Broadcasting Service (RUV) Activity was last seen on 5 August and a thermal anomaly in the crater was last identified in satellite images on 6 August. The crater had become deeper and smaller by 4 August. Gas plumes had typically risen 1-2 km above the vent, though on 1 August plumes rose more than 2.5 km, and according to news articles, a notable amount of fume rose from the vent on 4 August. Tremor had decreased during the previous 36 hours and reached background levels by 1500 on 5 August. Most Recent Weekly Report: 2 August-8 August 2023 Cite this ReportĪt 1706 on 5 August IMO lowered the Aviation Color Code for Fagradalsfjall to Yellow (the second level on a four-color scale), noting that the eruption had declined during the previous few days and very minor activity at the crater was visible in webcam images.
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