So, it was hours, not days! The eruption started near Fagradalsfjall / Meradalir yesterday at around 13:18 about 1.5 km north of Stóra-Hrut on a north-easterly southwest fissure. The onset was detected by a local webcam and later confirmed by scientists. The alert level is currently orange (Volcanic eruption is underway with no or minor ash emission.)
Like the previous eruption, lava is contained by the local geography so no infrastructure is currently threatened. Gas emissions are, however, a hazard. The lava flow is estimated to be 5 – 10 times that of Geldingadalir at 32 cubic meters per second in the first 24 hours; gas emissions may well be similarly larger.
Visitors are advised not to approach the site at the moment. When the site is open, bear in mind that it is not an easy walk, so for the fit only, and visitors should be properly prepared, including having gas masks and metres.
A video made by Reykjanes Grapevine shows the eruption site yesterday: RVK Newscast #203: New Volcanic Eruption In Iceland – YouTube
Seismic activity has decreased since the onset of the eruption. We have now updated our earthquake plots to 4th August 2022 10:27- see below.
Updated earthquake plots
At the time of updating, we did not have confirmation of the coordinates of the eruption site, so we have guessed based on maps of the fissure. The plots will be updated when more up to date information becomes available.
Happy volcano watching and stay safe.
Armchair Volcanologist
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Sources: within the text
An Armchair Volcanologist 
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