Þeistareykir

Photo of this volcano
  • Country
  • Volcanic Region
  • Primary Volcano Type
  • Last Known Eruption
  • 65.833°N
  • 17.166°W

  • 540 m
    1771 ft

  • 373090
  • Latitude
  • Longitude

  • Summit
    Elevation

  • Volcano
    Number

The Global Volcanism Program has no activity reports for Þeistareykir.

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

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

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.

Eruptive History


There is data available for 3 Holocene eruptive periods.


Start Date Stop Date Eruption Certainty VEI Evidence Activity Area or Unit
0900 BCE ± 100 years Unknown Confirmed 0 Tephrochronology Storihver (Theistareykjahraun)
6800 BCE (?) Unknown Confirmed 0 Tephrochronology Borgarhraun and other flows
9500 BCE (?) Unknown Confirmed 0 Tephrochronology Theistareykjabunga shield volcano

Deformation History


There is data available for 1 deformation periods. Expand each entry for additional details.


Deformation during 2005 - 2009 [Uplift; Observed by GPS, InSAR]

Start Date: 2005 Stop Date: 2009 Direction: Uplift Method: GPS, InSAR
Magnitude: 3.000 cm Spatial Extent: Unknown Latitude: Unknown Longitude: Unknown

Remarks: InSAR analysis from 2005-2009 shows inflation at Theistareykir central volcano with a maximum deformation rate between 2007 and 2008.

Unwrapped ENVISAT interferograms spanning 2007?2008, with the deformation normalized to 1 yr (A/D), Mogi model prediction with the Mogi source M indicated (B/E), and residuals between the data and the model predictions (C/F) for ascending (A?C) and descending track (D?F). The dashed lines mark the model segments of the plate-boundary and the arrows indicate the line-of-sight (LOS) from the ground towards the satellite.

From: Metzger et al. 2011.


Reference List: Metzger et al. 2011.

Full References:

Metzger, S., Jónsson, S. and Geirsson, H., 2011. Locking depth and slip-rate of the Húsavík Flatey fault, North Iceland, derived from continuous GPS data 2006-2010. Geophysical Journal International, 187: 564-576. doi: 10.1111/j.1365-246X.2011.05176.x.

Emission History


There is no Emissions History data available for Þeistareykir.

Photo Gallery


Stora-Viti crater, seen here from the SE, caps the low, 564-m-high Theistareykjarbunga shield volcano, the northernmost subaerial volcanic system along the eastern volcanic zone of Iceland. The Holocene Theistareykjarbunga shield volcano and its associated N-S fissure system extend from north of Myvatn lake to the northern coast of Iceland. The youngest dated eruption produced the Theistareykjahraun lava flow about 2700 years ago.

Photo by Michael Ryan, 1984 (U.S. Geological Survey).
See title for photo information.
The small Litla-Viti pit crater (left) lies immediately SSW of Stora-Viti crater (right) at the summit of the very low-angle Theistareykjarbunga shield volcano. The low, 564-m-high shield volcano is part of the northernmost subaerial volcanic system of Iceland's eastern volcanic zone.

Photo by Michael Ryan, 1984 (U.S. Geological Survey).
See title for photo information.
An aerial view from the north shows features of the Theistareykjabunga and Krafla volcanic systems. The very-low-relief Theistareykjabunga volcano, capped by the summit craters of Stora-Viti and Litla-Viti, appears at the lower left. The topographically indistinct Krafla caldera (center) is cut by prominent fissure swarms. The flat, mesa-like areas at the right and other topographically prominent features throughout the photo are table mountains and ridges formed during Pleistocene subglacial eruptions.

Photo by Oddur Sigurdsson, 1977 (Icelandic National Energy Authority).
See title for photo information.
An aerial view from the north shows features of the Theistareykjabunga and Krafla volcanic systems. The very-low-relief Theistareykjabunga volcano, capped by the summit craters of Stora-Viti and Litla-Viti, appears at the lower left. The topographically indistinct Krafla caldera (center) is cut by prominent fissure swarms. The flat, mesa-like areas at the right and other topographically prominent features throughout the photo are table mountains and ridges formed during Pleistocene subglacial eruptions.

Photo by Oddur Sigurdsson, 1977 (Icelandic National Energy Authority).
See title for photo information.

Smithsonian Sample Collections Database


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

Affiliated Sites