Summary
Three-dimensional electrical conductivity model for the eastern US Midcontinent. Inverse solution was found using ModEM. Inversion methodology described in Murphy et al. (2023). The original model was rotated 40 degrees east of north; this version has been re-gridded to geographic lat/lon.
Quicklinks
Description
| Name | EGR-MT |
| Title | Eastern Midcontinent USA 3D Lithospheric Electrical Conductivity Model |
| Type | 3-D Electrical Conductivity Earth Model |
| Units | log10 electrical conductivity, in Seimens/meter |
| Year | 2023 |
| Data Revision | r0.0 (revision history) |
| Short Description | Three-dimensional electrical conductivity model for the eastern US Midcontinent. Inverse solution was found using ModEM. Inversion methodology described in Murphy et al. (2023). The original model was rotated 40 degrees east of north; this version has been re-gridded to geographic lat/lon. No data values are -99999. |
| Authors: | Benjamin S. Murphy, Geological Hazards Science Center, Geomagnetism Program, U.S. Geological Survey, Golden, CO, 80401, USA [now at Murphy Geo Consulting, LLC] Michael S. DeLucia, Department of Geology and Environmental Geoscience, College of Charleston, Charleston, South Carolina 29424, USA Stephen Marshak, Department of Geology, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, USA Dhananjay Ravat, Department of Earth and Environmental Sciences, University of Kentucky, Lexington, Kentucky 40506, USA Paul A. Bedrosian, Geology, Geophysics, and Geochemistry Science Center, U.S. Geological Survey, Denver, Colorado 80225, USA |
| Reference Model | N/A |
| Prior Model | None |
| Inversion Software | Modular System for Electromagnetic Inversion, Egbert and Kelbert (2012) |
| Model Download | EGR.MT.Murphyetal2023.conductivity.r0.0.nc (see metadata) is the model in netCDF 3 Classic format. EGR-MT.ModelBundle.zip is the model in its original format |
| Model Home Page | None |
| Depth Coverage | 0 to 400 km depth |
| Area | Eastern US Midcontinent (33.5° to 46.0° latitude, -95.4° to -78.7° longitude) |
| Data Set Description | Model created by inverting full impedance tensors and vertical magnetic field transfer functions (period range ~ 10 – 10000 s) from 215 long-period MT stations across the eastern US Midcontinent. |
Citations and DOIs
To cite the original work behind this Earth model:
- Murphy, B.S., DeLucia, M.S., Marshak, S., Ravat, D., and Bedrosian, P.A., (2023). Magnetotelluric insights into the formation and reactivation of trans-crustal shear zones in Precambrian basement of the eastern U.S. Midcontinent. GSA Bulletin 136(7-8): 2661-2675. https://doi.org/10.1130/B37099.1
To cite IRIS DMC Data Products effort:
- Trabant, C., A. R. Hutko, M. Bahavar, R. Karstens, T. Ahern, and R. Aster (2012), Data Products at the IRIS DMC: Stepping Stones for Research and Other Applications, Seismological Research Letters, 83(5), 846–854, https://doi.org/10.1785/0220120032.
DOI for this EMC webpage: https://doi.org/10.17611/dp/emc.2024.egrmtmurphy.1
References
- Gary D. Egbert, Anna Kelbert, Computational recipes for electromagnetic inverse problems, Geophysical Journal International, Volume 189, Issue 1, April 2012, Pages 251–267, https://doi.org/10.1111/j.1365-246X.2011.05347.x
Credits
- r0.0 model provided by Benjamin S. Murphy.
Revision History
revision r0.0: uploaded October 1, 2024.
Timeline
- 2024-10-02
- r0.0 online
