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The eruption in Mt. Fagradalsfjall started on March 19th, 2021 at 8:45 PM after an increased seismic activity on the Reykjanes peninsula for over a year, dating back to January 2020. These events were unusual, compared to the background activity in the area over the last decades.

Periods of rifting and volcanism occur at intervals of 800-1000 years on the Reykjanes Peninsula, alternating with periods of earthquake episodes occurring at intervals of a few tens of years. The latest eruption was the Reykjanes Fires in 1210-1240 AD, where eruptive fissures within both the Reykjanes and the Eldvörp-Svartsengi volcanic systems were active, producing extensive lava flows.

Read more about the eruption: The Icelandic Met Office