Geoelectric hazard maps for the continental United States
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Abstract
In support of a multiagency project for assessing induction hazards, we present maps of extreme-value geoelectric amplitudes over about half of the continental United States. These maps are constructed using a parameterization of induction: estimates of Earth surface impedance, obtained at discrete geographic sites from magnetotelluric survey data, are convolved with latitude-dependent statistical maps of extreme-value geomagnetic activity, obtained from decades of magnetic observatory data. Geoelectric amplitudes are estimated for geomagnetic waveforms having 240 s sinusoidal period and amplitudes over 10 min that exceed a once-per-century threshold. As a result of the combination of geographic differences in geomagnetic activity and Earth surface impedance, once-per-century geoelectric amplitudes span more than 2 orders of magnitude and are an intricate function of location. For north-south induction, once-per-century geoelectric amplitudes across large parts of the United States have a median value of 0.26 V/km; for east-west geomagnetic variation the median value is 0.23 V/km. At some locations, once-per-century geoelectric amplitudes exceed 3 V/km.
Suggested Citation
Love, J.J., Pulkkinen, A., Bedrosian, P.A., Jonas, S., Kelbert, A., Rigler, E., Finn, C., Balch, C., Rutledge, R., Waggel, R., Sabata, A., Kozyra, J., Black, C., 2016, Geoelectric hazard maps for the continental United States: Geophysical Research Letters, v. 43, no. 18, p. 9415-9424, https://doi.org/10.1002/2016GL070469.
Study Area
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Geoelectric hazard maps for the continental United States |
| Series title | Geophysical Research Letters |
| DOI | 10.1002/2016GL070469 |
| Volume | 43 |
| Issue | 18 |
| Publication Date | September 19, 2016 |
| Year Published | 2016 |
| Language | English |
| Publisher | Wiley |
| Contributing office(s) | Geologic Hazards Science Center |
| Description | 10 p. |
| First page | 9415 |
| Last page | 9424 |
| Country | United States |