- Info & Contacts
The Global Volcanism Program has no activity reports for Grímsnes.
The Global Volcanism Program has no Weekly Reports available for Grímsnes.
The Global Volcanism Program has no Bulletin Reports available for Grímsnes.
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.
|Feature Name||Feature Type||Elevation||Latitude||Longitude|
|Feature Name||Feature Type||Elevation||Latitude||Longitude|
|Alftarholl||Crater||64° 1' 0" N||20° 58' 0" W|
|Kalfsholar||Crater Row||64° 3' 0" N||20° 55' 0" W|
|Kerholl||Crater||64° 3' 0" N||20° 50' 0" W|
|Kerlingarholl||Crater Row||64° 5' 0" N||20° 50' 0" W|
|Raudholar||Crater||64° 2' 0" N||20° 56' 0" W|
|Selholl North||Crater Row||64° 5' 0" N||20° 54' 0" W|
|Selholl South||Crater||64° 5' 0" N||20° 54' 0" W|
|Seydisholar||Crater Row||64° 4' 0" N||20° 50' 0" W|
|Tjarnarholar||Crater Row||64° 2' 0" N||20° 54' 0" W|
There is data available for 11 Holocene eruptive periods.
|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|
There is no Deformation History data available for Grímsnes.
There is no Emissions History data available for Grímsnes.
|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).
|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).
There are no samples for Grímsnes in the Smithsonian's NMNH Department of Mineral Sciences Rock and Ore collection.
|DECADE Data||The DECADE portal, still in the developmental stage, serves as an example of the proposed interoperability between The Smithsonian Institution's Global Volcanism Program, the MAGA Database, and the EarthChem Geochemical Portal. The Deep Earth Carbon Degassing (DECADE) initiative seeks to use new and established technologies to determine accurate global fluxes of volcanic CO2 to the atmosphere, but installing CO2 monitoring networks on 20 of the world's 150 most actively degassing volcanoes. The group uses related laboratory-based studies (direct gas sampling and analysis, melt inclusions) to provide new data for direct degassing of deep earth carbon to the atmosphere.|
Single Volcano View
Temporal Evolution of Unrest
Side by Side Volcanoes
|WOVOdat is a database of volcanic unrest; instrumentally and visually recorded changes in seismicity, ground deformation, gas emission, and other parameters from their normal baselines. It is sponsored by the World Organization of Volcano Observatories (WOVO) and presently hosted at the Earth Observatory of Singapore.|
|Large Eruptions of Grímsnes||Information about large Quaternary eruptions (VEI >= 4) is cataloged in the Large Magnitude Explosive Volcanic Eruptions (LaMEVE) database of the Volcano Global Risk Identification and Analysis Project (VOGRIPA).|
|MIROVA||Middle InfraRed Observation of Volcanic Activity (MIROVA) is a near real time volcanic hot-spot detection system based on the analysis of MODIS (Moderate Resolution Imaging Spectroradiometer) data. In particular, MIROVA uses the Middle InfraRed Radiation (MIR), measured over target volcanoes, in order to detect, locate and measure the heat radiation sourced from volcanic activity.|
|MODVOLC Thermal Alerts||Using infrared satellite Moderate Resolution Imaging Spectroradiometer (MODIS) data, scientists at the Hawai'i Institute of Geophysics and Planetology, University of Hawai'i, developed an automated system called MODVOLC to map thermal hot-spots in near real time. For each MODIS image, the algorithm automatically scans each 1 km pixel within it to check for high-temperature hot-spots. When one is found the date, time, location, and intensity are recorded. MODIS looks at every square km of the Earth every 48 hours, once during the day and once during the night, and the presence of two MODIS sensors in space allows at least four hot-spot observations every two days. Each day updated global maps are compiled to display the locations of all hot spots detected in the previous 24 hours. There is a drop-down list with volcano names which allow users to 'zoom-in' and examine the distribution of hot-spots at a variety of spatial scales.|
|EarthChem||EarthChem develops and maintains databases, software, and services that support the preservation, discovery, access and analysis of geochemical data, and facilitate their integration with the broad array of other available earth science parameters. EarthChem is operated by a joint team of disciplinary scientists, data scientists, data managers and information technology developers who are part of the NSF-funded data facility Integrated Earth Data Applications (IEDA). IEDA is a collaborative effort of EarthChem and the Marine Geoscience Data System (MGDS).|