Photo of this volcano
Google Earth icon
Google Earth Placemark
  • Country
  • Subregion Name
  • Primary Volcano Type
  • Last Known Eruption
  • 64.03°N
  • 20.87°W

  • 214 m
    702 ft

  • 371060
  • Latitude
  • Longitude

  • Summit

  • Volcano

There are no activity reports for Grímsnes.

 Available Weekly Reports

There are no Weekly Reports available for Grímsnes.

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 Unpublished manuscript.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.