Grimsnes

Photo of this volcano
  • Country
  • Volcanic Region
  • Primary Volcano Type
  • Last Known Eruption
  • 64.03°N
  • 20.87°W

  • 214 m
    702 ft

  • 371060
  • Latitude
  • Longitude

  • Summit
    Elevation

  • Volcano
    Number

The Global Volcanism Program has no activity reports for Grimsnes.

The Global Volcanism Program has no Weekly Reports available for Grimsnes.

The Global Volcanism Program has no Bulletin Reports available for Grimsnes.

Eruptive History


Summary of Holocene 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

This compilation of synonyms and subsidiary features may not be comprehensive. Features are organized into four major categories: Cones, Craters, Domes, and Thermal Features. Synonyms of features appear indented below the primary name. In some cases additional feature type, elevation, or location details are provided.

Photo Gallery


Grímsnes is a relatively small volcanic system located SE of Thingvallavatn lake east of an en echelon group of volcanic fields extending across the Reykjanes Peninsula. The Grímsnes volcanic field is seen here in an aerial view from the SW. 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, such as seen at the lower right. The eruptions of the Grímsnes lavas were restricted to a relatively short interval between about 6500 and 5500 years ago.

Photo by Oddur Sigurdsson, 1991 (Icelandic National Energy Authority).
See title for photo information.
A small pond fills the bottom of the Kerid crater at the northern end of the Tjarnarholar crater row in the Grímsnes volcanic system. The crater is elliptic in shape, 270 m long, 170 m wide, and 55 m deep. Other cinder cones of the Holocene Grímsnes volcanic field are visible in the background to the north. 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.

Photo by Lee Siebert, 2008 (Smithsonian Institution).
See title for photo information.

Smithsonian Sample Collections Database


There are no samples for Grimsnes in the Smithsonian's NMNH Department of Mineral Sciences Rock and Ore collection.

Affiliated Sites