Resistivity Survey of Grímsvötn


 Project ID: 09-01-016
  
 Project Coordination:  ISOR
 Name of Coordinator:  Knútur Árnason
  
 Other Partners: University of Iceland
  The University of Cologne, Germany
  
 Duration: 3 years

 Total Project cost: 
 After redefinishon: 

 64.350.000 ISK
 84.140.331 ISK 

 GEORG Funding: 26.250.000 ISK
    
 Project Website: 
  
 Publications / Reports: 

    Project Plan:

    Project Poster: 

    Final Report 1: 

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Project Abstract  09-01-016-1

The object of the project was to map the resistivity structure of the Grímsvötn geothermal system in detail using (far-) off-central TEM soundings (a variation of the LOTEM method). Locate and estimate the extent of magma bodies in the uppermost 3-5 km of the crust, using the resistivity data along with other existing geophysical data from the area (such as gravity, magnetic and seismic data) and build a conceptual model of the whole geothermal system. The unique situation in Grímsvötn, i.e. a glacier covered geothermal system, means that the natural thermal output of it can be estimated quite accurately. The geo-scientific and geothermal value of the project is to compare the size of the geothermal system and thermal output to estimate the thermal output of other systems, based on their structure and volume. The project has also a technical value as this variation of (LO)TEM measurements have not been used in Iceland before.
Due to volcanic eruption in 2010, projects was redefined.

Project stopped in 2010

 

Project Abstract  09-01-016-2

Continuation of project “Resistivity Survey of Grímsvötn” started in 2012 due to unforeseen incidents caused by volcanic eruption in Eyjafjallajökull in 2010 and in Grímsvötn in 2011. Deep resistivity surveys have greatly improved the understanding of the inner and deep nature of volcanic high-temperature geothermal systems. In this study the Long Offset Transient Electro-Magnetic (LOTEM) method will be used to map the spatial extend and depth span of resistivity anomalies within the Grímsvötn geothermal system, located in the glacier Vatnajökull.  The main objectives of a LOTEM survey of Grímsvötn are mapping the spatial extend and depth span of resistivity anomalies within the Grímsvötn geothermal area, mapping the location and extent of magma bodies in the uppermost 3-5 km of the crust under the volcano and assessing the thermal release from a pristine geothermal system in comparison with other high-temperature geothermal systems.

Project finished 2015