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Earth, Planets and Space
Fig. 1 | Earth, Planets and Space

Fig. 1

From: Geoelectric hazard assessment: the differences of geoelectric responses during magnetic storms within common physiographic zones

Fig. 1

Maps showing the locations of the magnetic observatories (available through the INTERMAGNET program) and the EarthScope USArray survey sites referenced to physiographic zones in red [derived from Fernberg (2012)]. a The NRC Brandon (BRD) magnetic observatory in Manitoba and the EarthScope sites MNB36 and RED36 in northern Minnesota. Both sites fall within the SU-1 physiographic zone. b The USGS Fredericksburg (FRD) magnetic observatory in Virginia and the EarthScope sites VAR57 and VAQ58 in southern and eastern Virginia, which fall within the PT-1 zone

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