期刊
GEOPHYSICAL RESEARCH LETTERS
卷 43, 期 18, 页码 9415-9424出版社
AMER GEOPHYSICAL UNION
DOI: 10.1002/2016GL070469
关键词
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资金
- operation of magnetic observatories and INTERMAGNET for promoting high standards of observatory practice
- Directorate For Geosciences
- Div Atmospheric & Geospace Sciences [1414517] Funding Source: National Science Foundation
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.
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