Targeting Of Potential Geothermal Resources In The Great Basin From Regional To Basin-Scale Relationship Between Geodetic Strain And Geological Structures

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Conference Paper: Targeting Of Potential Geothermal Resources In The Great Basin From Regional To Basin-Scale Relationship Between Geodetic Strain And Geological Structures

Abstract
We apply a new method to target potential geothermal resources on the regional scale in the Great Basin by seeking relationships between geologic structures and GPS-geodetic observations of regional tectonic strain. First, we establish a theoretical basis for underst~dingh ow the rate of fracture opening can be related to the directional trend of faults within the regional-scale strain field. Second, we develop a s ~ ~ n - s ~ c tmuertheod ology that uses a digitized database of Quaternary fault strikes and velocities of GPS stations. Results of our s~ain-s~uctuarnea lysis on the regional scale show a spatial relationship between known= geothermal activity and (1) change in the direction of fault orientations, (2) change in the direction of extensional strain, and (3) the magnitude of extensional strain, especially fault-normal extension associated with shear strain. In contrast, the dilitation component of strain is not a significant indicator of geothermal activity in the Great Basin. Using the observed relationships between strain and structure, the NE-SW trending Humboldt structural zone (HSZ) in north-eastern Nevada is clearly identifiable as a regional geothermal target. Based on our detection of an anomalous high in fault-normal extensional strain, we identify Buffalo Valley toward the NE extent of the HSZ as a potential geothermal target to be further explored using GPS. We therefore recommend investigating Buffalo Valley With fine spatial resolution (-1 0 km rather than the current -100 h) using a dense GPS network to assess its geothermal potential, by comparison of strain-s~ucturere lationships with current Power-producing areas within the HSZ.

Authors 
Geoffrey Blewittl, Mark F. Coolbaugh, Don Sawatzky, William Holt, James Davis and Richard A. Bennett








Published 
GRC, 2003





DOI 
Not Provided
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Citation

Geoffrey Blewittl,Mark F. Coolbaugh,Don Sawatzky,William Holt,James Davis,Richard A. Bennett. 2003. Targeting Of Potential Geothermal Resources In The Great Basin From Regional To Basin-Scale Relationship Between Geodetic Strain And Geological Structures. In: (!) ; (!) ; (!) . (!) : GRC; p. (!)


Related Geothermal Exploration Activities
Activities (9)


Areas (3)
  1. Central Nevada Seismic Zone Geothermal Region

  2. Northern Basin and Range Geothermal Region

  3. Northwest Basin and Range Geothermal Region
Regions (0)