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Magnetotellurics

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GEOTHERMAL ENERGYGeothermal Home

Exploration Technique: Magnetotellurics

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Exploration Technique Information
Exploration Group: Geophysical Techniques
Exploration Sub Group: Electrical Techniques
Parent Exploration Technique: Magnetotelluric Techniques
Information Provided by Technique
Lithology: Rock composition, mineral and clay content
Stratigraphic/Structural: Detection of permeable pathways, fracture zones, faults
Hydrological: Resistivity influenced by porosity, grain size distribution, permeability, fluid saturation, fluid type and phase state of the pore water
Thermal: Resistivity influenced by temperature
Cost Information
Low-End Estimate (USD): 522.22522.22 TUSD
522.22 MUSD
522.22 kUSD
52,222 centUSD / station
Median Estimate (USD): 1,738.831,738.83 TUSD
1,738.83 MUSD
1,738.83 kUSD
173,883 centUSD / station
High-End Estimate (USD): 2,297.622,297.62 TUSD
2,297.62 MUSD
2,297.62 kUSD
229,762 centUSD / station
Time Required
Low-End Estimate: 1.67 days0.00457 years
40.08 hours
0.239 weeks
0.0549 months / 10 stn
Median Estimate: 3.77 days0.0103 years
90.48 hours
0.539 weeks
0.124 months / 10 stn
High-End Estimate: 7.50 days0.0205 years
180 hours
1.071 weeks
0.246 months / 10 stn
Additional Info
Cost/Time Dependency: Location, Size, Resolution, Terrain, Weather
Dictionary.png
Magnetotellurics:
Magnetotellurics (MT) is a natural-source (i.e., passive), electromagnetic method that measures the ratio of earth’s naturally varying electric and magnetic fields over a wide range of frequencies to determine the resistivity structure of the subsurface (Reynolds, 1997).
Other definitions:Wikipedia Reegle


 
Introduction
 
See Magnetotelluric Techniques

MT is currently the resistivity method of choice for many geothermal exploration companies due in large part to its superior range of depth of penetration (several tens of meters to several tens of kilometers) over other resistivity methods.
 
Use in Geothermal Exploration
 
See Electrical Techniques: Use in Geothermal Exploration

In geothermal applications MT can be used to delineate the resource by indirectly mapping the smectite clay ring (where low temperature clay alteration transits to more resistive higher temperature alteration) that typically exists around a geothermal resource. MT is commonly used in the volcanic settings (such as the Cascades Region), because most projects are relatively deep, and most successful conventional resources will have a thick clay cap. 



 
Field Procedures
 
 A magnetotelluric survey consists of electric and magentic measurements at teh earth's surface. 



  
Typical layout for a standard MT recording station, indicating relative electrode line and induction magnetometer positions.[1]
 




 
Physical Properties
 
 See Magnetotelluric Techniques; Electrical Techniques 




 
Data Access and Acquisition
 
 
  
Metronix ADU07 data logger.[2]




  
Magnetotelluric time series with each recorded channel indicated. Ex and Ey are the electrical measurements while Hx, Hy and Hz are the three components of the magnetic field measurements.[2]
 




 
Potential Pitfalls
 
 See Magnetotelluric Techniques 








 
Additional References
 
 http://178.63.62.205/mtxgeo/images/brochures/FlyerMFS-06e_en_v33.pdf


http://178.63.62.205/mtxgeo/images/brochures/FlyerADU07e_en_v33.pdf

 




 
References
 
 
    

  1. ↑ (Moombariga Geoscience, 2009) "Magnetotelluric Methods "

    2. 

  2. ↑ 2.0 2.1 (Metronix, n.d.) "ADU-07e Product Memo "

    3. 

 











 Page
 Area 
 Activity Start Date 
 Activity End Date 
 Reference Material




 Magnetotellurics (Laney, 2005)

 Unspecified
















 Magnetotellurics (Muse, 1973)

 Unspecified
















 Magnetotellurics At Akutan Fumaroles Area (Kolker, Et Al., 2010)

 Akutan Fumaroles Geothermal Area
















 Magnetotellurics At Alum Area (DOE GTP)

 Alum Geothermal Area
















 Magnetotellurics At Beowawe Hot Springs Area (Garg, Et Al., 2007)

 Beowawe Hot Springs Geothermal Area
















 Magnetotellurics At Brady Hot Springs Area (Combs 2006)

 Brady Hot Springs Geothermal Area
















 Magnetotellurics At Central Nevada Seismic Zone Region (Pritchett, 2004)

 Central Nevada Seismic Zone Geothermal Region
















 Magnetotellurics At Coso Geothermal Area (2004)

 Coso Geothermal Area

 2004

 2004












 Magnetotellurics At Coso Geothermal Area (2006)

 Coso Geothermal Area

 2006

 2006












 Magnetotellurics At Cove Fort Area (Toksoz, Et Al, 2010)

 Cove Fort Geothermal Area
















 Magnetotellurics At Dixie Hot Springs Area (Combs 2006)

 Dixie Hot Springs Geothermal Area
















 Magnetotellurics At Dixie Valley Geothermal Field Area (Laney, 2005)

 Dixie Valley Geothermal Area
















 Magnetotellurics At Grass Valley Area (Morrison, Et Al., 1979)

 Grass Valley Geothermal Area
















 Magnetotellurics At International Geothermal Area, Indonesia (Laney, 2005)

 International Geothermal Area Indonesia
















 Magnetotellurics At Jemez Pueblo Area (DOE GTP)

 Jemez Pueblo Geothermal Area
















 Magnetotellurics At Kilauea East Rift Area (Laney, 2005)

 Kilauea East Rift Geothermal Area
















 Magnetotellurics At Kilauea Southwest Rift And South Flank Area (Laney, 2005)

 Kilauea Southwest Rift And South Flank Geothermal Area
















 Magnetotellurics At Long Valley Caldera Area (Sorey, Et Al., 1991)

 Long Valley Caldera Geothermal Area
















 Magnetotellurics At Mccoy Geothermal Area (DOE GTP)

 McCoy Geothermal Area
















 Magnetotellurics At Mcgee Mountain Area (DOE GTP)

 Mcgee Mountain Geothermal Area
















 Magnetotellurics At Medicine Lake Area (Cumming And Mackie, 2007)

 Medicine Lake Geothermal Area
















 Magnetotellurics At New River Area (DOE GTP)

 New River Geothermal Area
















 Magnetotellurics At Newberry Caldera Area (DOE GTP)

 Newberry Caldera Geothermal Area
















 Magnetotellurics At Northern Basin & Range Region (Pritchett, 2004)

 Northern Basin and Range Geothermal Region
















 Magnetotellurics At Nw Basin & Range Region (Pritchett, 2004)

 Northwest Basin and Range Geothermal Region
















 Magnetotellurics At Raft River Geothermal Area (1977)

 Raft River Geothermal Area

 1977

 1977












 Magnetotellurics At Rio Grande Rift Region (Aiken & Ander, 1981)

 Rio Grande Rift Geothermal Region
















 Magnetotellurics At Roosevelt Hot Springs Area (Combs 2006)

 Roosevelt Hot Springs Geothermal Area
















 Magnetotellurics At Silver Peak Area (DOE GTP)

 Silver Peak Geothermal Area
















 Magnetotellurics At Socorro Mountain Area (Owens, Et Al., 2005)

 Socorro Mountain Geothermal Area
















 Magnetotellurics At Soda Lake Area (Combs 2006)

 Soda Lake Geothermal Area
















 Magnetotellurics At Stillwater Area (Laney, 2005)

 Stillwater Geothermal Area
















 Magnetotellurics At Truckhaven Area (Layman Energy Associates, 2010)

 Truckhaven Geothermal Area
















 Magnetotellurics At Truckhaven Area (Warpinski, Et Al., 2004)

 Truckhaven Geothermal Area
















 Magnetotellurics At U.S. West Region (Aiken & Ander, 1981)

 U.S. West Region
















 Magnetotellurics At Valles Caldera - Redondo Area (Wilt & Haar, 1986)

 Valles Caldera - Redondo Geothermal Area
















 Magnetotellurics At Valles Caldera - Sulphur Springs Area (Wilt & Haar, 1986)

 Valles Caldera - Sulphur Springs Geothermal Area
















 Magnetotellurics At Walker-Lane Transitional Zone Region (Pritchett, 2004)

 Walker-Lane Transition Zone Geothermal Region














  1. Unspecified
  2. Akutan Fumaroles Geothermal Area
  3. Alum Geothermal Area
  4. Beowawe Hot Springs Geothermal Area
  5. Brady Hot Springs Geothermal Area
  6. Central Nevada Seismic Zone Geothermal Region
  7. Coso Geothermal Area
  8. Cove Fort Geothermal Area
  9. Dixie Hot Springs Geothermal Area
  10. Dixie Valley Geothermal Area
  11. Grass Valley Geothermal Area
  12. International Geothermal Area Indonesia
  13. Jemez Pueblo Geothermal Area
  14. Kilauea East Rift Geothermal Area
  15. Kilauea Southwest Rift And South Flank Geothermal Area
  16. Long Valley Caldera Geothermal Area
  17. McCoy Geothermal Area
  18. Mcgee Mountain Geothermal Area
  19. Medicine Lake Geothermal Area
  20. New River Geothermal Area
  21. Newberry Caldera Geothermal Area
  22. Northern Basin and Range Geothermal Region
  23. Northwest Basin and Range Geothermal Region
  24. Raft River Geothermal Area
  25. Rio Grande Rift Geothermal Region
  26. Roosevelt Hot Springs Geothermal Area
  27. Silver Peak Geothermal Area
  28. Socorro Mountain Geothermal Area
  29. Soda Lake Geothermal Area
  30. Stillwater Geothermal Area
  31. Truckhaven Geothermal Area
  32. U.S. West Region
  33. Valles Caldera - Redondo Geothermal Area
  34. Valles Caldera - Sulphur Springs Geothermal Area
  35. Walker-Lane Transition Zone Geothermal Region









  1. Central Nevada Seismic Zone Geothermal Region
  2. Northern Basin and Range Geothermal Region
  3. Northwest Basin and Range Geothermal Region
  4. Rio Grande Rift Geothermal Region
  5. Walker-Lane Transition Zone Geothermal Region





















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