The Krýsuvík-Trölladyngja volcanic system on the Reykjanes Volcanic Zone has been moderately active in the Holocene (last 8000 years). The last eruption started on the 19th of March 2021 after about 870 years of repose. It takes place on a secondary swarm of the Krýsuvík-Trölladyngja system, called Fagradalsfjall that is sometimes considered a separate volcanic system. The last eruptive episode before the 2021 eruption, consisting of two eruptions separated by 37 years, occurred in the 12 century CE, the lava flows reaching to the sea on the north and south coast of the peninsula.
The NE-SW trending volcanic system comprises a 50 km long, composite fissure swarm without a developed central volcano. Maximum elevation is ~400 m a.s.l. The system has no ice cover but a large lake lies within the system.
The characteristic activity is effusive basaltic eruptions producing lava flows covering some tens of km2 and minor tephra deposits. Eruption frequency during the last 3000 years is 1 eruption per 750 years.
https://icelandicvolcanos.is//?volcano=KRY#
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