Electrical Conductance Maps of the Great Basin, USA

Dates

Publication Date: 2022-06-23
Start Date: 1980

Citation

Peacock, J.R. and Bedrosian, P., 2022, Electrical Conductance Maps of the Great Basin, USA: U.S. Geological Survey data release, https://doi.org/10.5066/P9TWT2LU.

Summary

Images of subsurface electrical conductivity are useful for locating fluids and other electrically conductive phases at depth in the Earth. This data release presents electrical conductance maps estimated from a 3D model of the Great Basin, USA, at five different depth ranges, spanning 2 to 200 km depth. Electrical conductance is the integration of electrical conductivity in a depth range. Great Basin electrical conductivity is estimated through 3D inverse modeling of over 800 publicly available magnetotelluric (MT) transfer functions. The transfer functions can be found on the electromagnetic transfer function repository hosted by the Incorporated Research Institutions of Seismology (IRIS) data management center (https://ds.iris.edu/spud/emtf, [...]

Summary

Images of subsurface electrical conductivity are useful for locating fluids and other electrically conductive phases at depth in the Earth. This data release presents electrical conductance maps estimated from a 3D model of the Great Basin, USA, at five different depth ranges, spanning 2 to 200 km depth. Electrical conductance is the integration of electrical conductivity in a depth range. Great Basin electrical conductivity is estimated through 3D inverse modeling of over 800 publicly available magnetotelluric (MT) transfer functions. The transfer functions can be found on the electromagnetic transfer function repository hosted by the Incorporated Research Institutions of Seismology (IRIS) data management center (https://ds.iris.edu/spud/emtf, Kelbert et al. (2011) and Kelbert et al. (2018)), the geothermal data repository (https://gdr.openei.org/home), and Science Base. The inversion code ModEM (Egbert et al., 2012; Kelbert et al., 2014), run on the U.S. Geological Survey's high-performance computer Yeti, provides estimates of subsurface 3D electrical conductivity.

The following conductance layers are estimated:

gb_conductance_surface_tp.tif [2 - 12 km depth]
gb_conductance_middle_crust_tp.tif [12 - 20 km depth]
gb_conductance_lower_crust_tp.tif [20 - 50 km depth]
gb_conductance_upper_mantle_tp.tif [50 - 90 km depth]
gb_conductance_mantle_tp.tif [90 - 200 km depth]

This work was undertaken as part of the INGENIOUS (Innovative Geothermal Exploration through Novel Investigations of Undiscovered Systems) project funded by the U.S. Department of Energy Geothermal Technologies Office awarded to the University of Nevada, Reno. INGENIOUS is a multi-disciplinary, multi-institution effort to develop new methodologies and best practices to accelerate the discovery of new, commercially viable geothermal resources. This work was also supported by the U.S. Geological Survey Geothermal Resources Investigations Project (GRIP).

Kelbert, A., Egbert, G. D. and Schultz, A. (2011), IRIS DMC Data Services Products: EMTF, The Magnetotelluric Transfer Functions. doi: https://doi.org/10.17611/DP/EMTF.1.
Kelbert, A., Erofeeva, S., Trabant, C., Karstens, R., and Van Fossen, M. (2018), Taking magnetotelluric data out of the drawer. Eos, 99, doi:https://doi.org/10.1029/2018EO112859.
Egbert, G. D., and Kelbert, A. (2012). Computational recipes for electromagnetic inverse problems. Geophysical Journal International, 189(1), 251-267, doi:https://doi.org/10.1111/j.1365-246X.2011.05347.x.
Kelbert, A., Meqbel, N., Egbert, G. D., and Tandon, K. (2014). ModEM: A modular system for inversion of electromagnetic geophysical data. Computers and Geosciences, 66, 40-53, doi:https://doi.org/10.1016/j.cageo.2014.01.010.

Contacts

Point of Contact :: Jared R Peacock
Originator :: Jared R Peacock, Paul A Bedrosian
Metadata Contact :: Jared R Peacock
Publisher :: U.S. Geological Survey
Data Owner :: Geology, Minerals, Energy, and Geophysics Science Center
Funder :: Energy Resources Program, Mineral Resources Program
Distributor :: U.S. Geological Survey - ScienceBase
SDC Data Owner :: Geology, Minerals, Energy, and Geophysics Science Center
USGS Mission Area :: Energy and Minerals

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Electrical_Conductance_Maps_of_the_Great_Basin_USA_02.xml Original FGDC Metadata	View	18.43 KB	application/fgdc+xml

Extension: gb_conductance_surface_tp.zip
gb_conductance_surface_tp.tfw		97 Bytes
gb_conductance_surface_tp.tif		3.94 MB
gb_conductance_surface_tp.tif.aux.xml		1.89 KB
gb_conductance_surface_tp.tif-ColorRamp.SLD		2.07 KB

Extension: gb_conductance_middle_crust_tp.zip
gb_conductance_middle_crust_tp.tfw		97 Bytes
gb_conductance_middle_crust_tp.tif		3.94 MB
gb_conductance_middle_crust_tp.tif.aux.xml		1.99 KB
gb_conductance_middle_crust_tp.tif-ColorRamp.SLD		2.01 KB

Extension: gb_conductance_lower_crust_tp.zip
gb_conductance_lower_crust_tp.tfw		97 Bytes
gb_conductance_lower_crust_tp.tif		3.94 MB
gb_conductance_lower_crust_tp.tif.aux.xml		1.82 KB
gb_conductance_lower_crust_tp.tif-ColorRamp.SLD		2.01 KB

Extension: gb_conductance_upper_mantle_tp.zip
gb_conductance_upper_mantle_tp.tfw		97 Bytes
gb_conductance_upper_mantle_tp.tif		3.94 MB
gb_conductance_upper_mantle_tp.tif.aux.xml		1.71 KB
gb_conductance_upper_mantle_tp.tif-ColorRamp.SLD		2.01 KB

Extension: gb_conductance_mantle_tp.zip
gb_conductance_mantle_tp.tfw		97 Bytes
gb_conductance_mantle_tp.tif		3.94 MB
gb_conductance_mantle_tp.tif.aux.xml		1.6 KB
gb_conductance_mantle_tp.tif-ColorRamp.SLD		2.01 KB

Purpose

The purpose of these electrical conductance raster images are to provide information about subsurface fluids and fluid pathways. This information can help inform characterization of existing and fossil geothermal systems.

Electrical Conductance Maps of the Great Basin, USA

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