A screenshot from the seismograph showing the hours before the eruption. A very low tremor is current to the right of the image and only on those monitors next to the eruption site, (bottom lines). The eruption starts at ca 20:45, time stamp is at the bottom. #Reykjanes #Eruption pic.twitter.com/OKMNBlthxX

— Icelandic Meteorological Office - IMO (@Vedurstofan) March 20, 2021