Sub-glacial volcanic eruption under Dyngjujökull glacier 23. ágúst 2014 18:25 The Icelandic Met Office believes that a small sub-glacial volcanic eruption has started under the icecap of Dyngjujökull glacier in the Northern part of Vatnajökull glacier. There is no visible eruption cloud and the eruption could remain sub-glacial. MeltwaterHydrological measurements at Jökulsá Á Fjöllum, Upptypingar do not indicate a contribution ofgeothermal/volcanic gases to the hydrological system that is outside of the typical range observed in the last decade until now. Water melting from the glacier/lava interactions could reach this station after 0-20 hours.Seismic tremorStarting at 11:18, seismic tremor was observed at 1 and 1.5 Hz. This is consistent with lava/ice interaction. and is similar to the tremor observed during the Fimmvörðuháls eruption and the lava flowing phase of the Eyjafjallajökull eruption. We are not observing explosions in the tremor data, which suggests it is a relatively small volume of lava in contact with the ice.EarthquakesThe frequency of earthquakes is so high, that the events are overlapping in time, and it is difficult to discern individual events. We are currently interpreting the depth of the majority of earthquakes(5-10 km) as the depth of the base of the dyke. The dyke has propagated about 5 km to the north since yesterday.GPS deformationMost recent GPS data shows that magma flow is continuing. Since the start of unrest on August 16th, the total displacement across the dyke intrusion has been over 20 cm. A model to fit the GPS data suggests that the volume of magma contained within the dyke is approximately 250 million cubic meters. The Dyngjuháls and Kverkfjöll GPS stations show continuing deformation.Overall assessmentThe aviation color code has been raised to "red" as the data is currently interpreted as a subglacial eruption. Both the thickness of the ice at the possible contact point (100-400 m) and the volume of lava in possible contact with the ice are highly uncertain. It could be 0-20 hours before lava reaches the surface of the ice. It is also possible that the lava will not break through the ice, and the eruption could remain subglacial. News in English Mest lesið Vegaframkvæmdir við Höfðabakka valdi bæði umferðaröngþveiti og töfum Innlent Keyrðu hratt á hjólreiðastíg og tóku fram úr reiðhjólamönnum á háannatíma Innlent Vonast til að uppsagnir leiði ekki til flutnings fólks af svæðinu Innlent Þriggja mánaða bið eftir greftrun: „Þetta var óbærilegur yfirgangur“ Innlent Biskup lætur Rúv heyra það vegna umræðunnar í gær Innlent Enn eigi margir eftir að gera upp hug sinn um aðildarviðræður Innlent Laugarnestangi skrefi nær friðlýsingu Innlent „Borgarstjórn stendur með trans fólki og hinsegin samfélaginu öllu“ Innlent Bjarnhólastígur gata ársins í Kópavogi Innlent Vonbrigði að tillögu um símabann og samræmd próf hafi verið vísað frá Innlent
The Icelandic Met Office believes that a small sub-glacial volcanic eruption has started under the icecap of Dyngjujökull glacier in the Northern part of Vatnajökull glacier. There is no visible eruption cloud and the eruption could remain sub-glacial. MeltwaterHydrological measurements at Jökulsá Á Fjöllum, Upptypingar do not indicate a contribution ofgeothermal/volcanic gases to the hydrological system that is outside of the typical range observed in the last decade until now. Water melting from the glacier/lava interactions could reach this station after 0-20 hours.Seismic tremorStarting at 11:18, seismic tremor was observed at 1 and 1.5 Hz. This is consistent with lava/ice interaction. and is similar to the tremor observed during the Fimmvörðuháls eruption and the lava flowing phase of the Eyjafjallajökull eruption. We are not observing explosions in the tremor data, which suggests it is a relatively small volume of lava in contact with the ice.EarthquakesThe frequency of earthquakes is so high, that the events are overlapping in time, and it is difficult to discern individual events. We are currently interpreting the depth of the majority of earthquakes(5-10 km) as the depth of the base of the dyke. The dyke has propagated about 5 km to the north since yesterday.GPS deformationMost recent GPS data shows that magma flow is continuing. Since the start of unrest on August 16th, the total displacement across the dyke intrusion has been over 20 cm. A model to fit the GPS data suggests that the volume of magma contained within the dyke is approximately 250 million cubic meters. The Dyngjuháls and Kverkfjöll GPS stations show continuing deformation.Overall assessmentThe aviation color code has been raised to "red" as the data is currently interpreted as a subglacial eruption. Both the thickness of the ice at the possible contact point (100-400 m) and the volume of lava in possible contact with the ice are highly uncertain. It could be 0-20 hours before lava reaches the surface of the ice. It is also possible that the lava will not break through the ice, and the eruption could remain subglacial.
News in English Mest lesið Vegaframkvæmdir við Höfðabakka valdi bæði umferðaröngþveiti og töfum Innlent Keyrðu hratt á hjólreiðastíg og tóku fram úr reiðhjólamönnum á háannatíma Innlent Vonast til að uppsagnir leiði ekki til flutnings fólks af svæðinu Innlent Þriggja mánaða bið eftir greftrun: „Þetta var óbærilegur yfirgangur“ Innlent Biskup lætur Rúv heyra það vegna umræðunnar í gær Innlent Enn eigi margir eftir að gera upp hug sinn um aðildarviðræður Innlent Laugarnestangi skrefi nær friðlýsingu Innlent „Borgarstjórn stendur með trans fólki og hinsegin samfélaginu öllu“ Innlent Bjarnhólastígur gata ársins í Kópavogi Innlent Vonbrigði að tillögu um símabann og samræmd próf hafi verið vísað frá Innlent