VOLCANO BECOMES UNPREDICTABLE OUTFLOWS DECREASE AND INCREASE

Volcano as seen from the Long Ridge on July 28. Iceland News from Visir: "The eruption is puzzling and leaves scientists wondering". Jakob Bjarnar writes July 29, 2021 3:07 PM: Those who thought that now was the last chance to see the eruption in Reykjanes can still slow it down. OR SO IT SEEMS TO BE AS IT IS NOW, THE ERUPTION IS IN GOOD GEAR. After the eruption in Reykjanes had slowed down considerably and many people had begun to imagine that it was about to burn out, it has taken over significantly in the last 24 hours. There does not seem to be a gap in the eruption in Fagradalsfjall, it is in a state of shock. A number of netizens have posted pictures on social media of a glow caused by the eruption that erupted from the capital area yesterday. And it's clear that it's not going anywhere. An update on an overview of the lava flow on the website of the Institute of Earth Sciences at the University of Iceland reviews the situation as it currently stands. "In a summary on July 22, it was reported that lava flows had decreased before part of July and if this trend continued, the eruption would be eliminated. The latest measurements on July 27 show that this trend has reversed. The lava flow has increased again and is probably as much now or more than it was when it was highest in June. " The eruption clearly gave way but that was then Uncertainty in the assessment of the flow over the last 7-10 days, however, is said to be too great to be able to present a reliable figure. It is stated that the measurements show the volume and changes in it. "The density of lava can vary and it has been pointed out that next to craters there is more cavity than far away." Therefore, researchers at the University have not made an attempt to assess the effect of finding the equivalent volume of dense rock or the mass of the lava. The rule of thumb is that the volume of dense rock is about 80 percent of the total volume. Not long ago it was said that there was probably an eruption on the beach. But the eruption itself is not in those pants and gives those who issued a semi-valid death certificate a long nose. "The volcanic activity changed at the end of June. Then the activity began to fluctuate between periods with a strong lava flow and then quiet periods in between. The current measurements show that lava flow has decreased significantly. The eruption is therefore clearly decreasing, "said in a similar survey sent by the Institute of Earth Sciences at the University of Iceland earlier this month. An eruption unlike the ones we know from recent decades But now the situation has changed, as the eruption in Fagradalsfjall is in many ways different from the eruptions we know from recent decades, which have originated in magma chambers under main volcanoes where the pressure in the chamber and its size seem to largely determine the size and length of the eruption. The scientist Magnús Tumi Guðmundsson is one of the authors of the review. "In Fagradalsfjall, this seems to be protected somewhat differently. It can be seen that the inflow veins and its properties largely determine the magma flow. The channel opened was relatively narrow and lon6g (reaching a depth of ~ 17 km) and the carrying capacity was limited. "An increase in lava flow over time for the first six weeks indicates that the channel has widened somewhat over time, probably due to erosion in its walls," says the summary. It is also pointed out that the behavior of the eruption since the end of June is particularly interesting. "The flow was slightly lower in the first half of the month than it was in June, but it seems to have increased again as the abdominal activity became normal in the middle of the month. Assumptions have therefore changed since the last assessment was made. " The author of the report says, almost mockingly, that it is not possible to say when this eruption will end. "We just have to wait and see. #Iceland2021 #Langihryggur #Fagradalsfjall

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