New measurements from Institute of Earth Sciences
Institute of Earth Sciences regularly publishes new data about the eruption in Fagradalsfjall, the lasp update was on 19th of september 2021
22.09.2021
According to the measurements the lava is now 151 million cubic meters and 4.8 square kilometers. You can find more detailed measurements of the eruption here.
Also The Icelandic Institute of Natural History or Náttúrufræðistofnun íslands, regularly posts 3d models of the eruption area that can be found on the website Sketchfab.