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Summary of eruption dates and Volcanic Explosivity Indices (VEI).
|Start Date||Stop Date||Eruption Certainty||VEI||Evidence||Activity Area or Unit|
|3500 BCE (?)||Unknown||Confirmed||2||Tephrochronology||Kalfsholar|
|3650 BCE (?)||Unknown||Confirmed||0||Tephrochronology||Borgarholar|
|3750 BCE (?)||Unknown||Confirmed||0||Tephrochronology||Raudholar|
|3900 BCE (?)||Unknown||Confirmed||0||Tephrochronology||Kolgrafarholl|
|4000 BCE (?)||Unknown||Confirmed||2||Tephrochronology||Alftarholl|
|4050 BCE (?)||Unknown||Confirmed||0||Tephrochronology||Borgaholl|
|4270 BCE ± 150 years||Unknown||Confirmed||3||Radiocarbon (uncorrected)||Kerholar|
|4450 BCE (?)||Unknown||Confirmed||2||Tephrochronology||Selholl North|
|4500 BCE (?)||Unknown||Confirmed||0||Tephrochronology||Selholl South|
|6250 BCE (?)||Unknown||Confirmed||Radiocarbon (corrected)|
|7750 BCE (?)||Unknown||Confirmed||3||Radiocarbon (corrected)||Seydisholar|
The following references are the sources used for data regarding this volcano. References are linked directly to our volcano data file. Discussion of another volcano or eruption (sometimes far from the one that is the subject of the manuscript) may produce a citation that is not at all apparent from the title. Additional discussion of data sources can be found under Volcano Data Criteria.
Gudmundsson A T, 1986b. Iceland-Fires. Reykjavik: Vaka-Helgafell, 168 p.
Jakobsson S P, 1966. The Grimsnes lavas SW-Iceland. Acta Nat Islandica, 2: 6-30.
Jakobsson S P, 1976. The age of the Grimsnes lavas. Natturufraedingurinn, 46: 153-162 (in Icelandic).
Sinton J, Gronvold K, Saemundsson K, 2005. Postglacial eruptive history of the Western Volcanic Zone, Iceland. Geochem Geophys Geosyst, 6(12): 10.1029/2005CG001021.
Steinthorsson S, et al., 2002. Catalog of Active Volcanoes of the World - Iceland. Unpublished manuscript.
Grímsnes is a relatively small volcanic system located SE of Thingvallavatn lake. The Grímsnes volcanic system is displaced about 15-20 km to the east of the other en echelon group of volcanic fields of the Western Volcanic Zone extending across the Reykjanes Peninsula. Grímsnes lava flows cover 54 sq km and were erupted from a group of 11 fissures that produced a series of NE-SW-trending crater rows. The eruptions of the basaltic Grímsnes lavas were considered to have been restricted to a relatively short interval between about 6500 and 5500 years ago, but later work showed that some of the lava flows were radiocarbon dated at between about 7400 and 8900 years ago.