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Table 2 qEM at different altitudes

From: Possible correlation between the vertical component of lithospheric magnetic field and continental seismicity

Altitudes (km) 0 50 100 200 400
Bz range for most earthquakes (nT) 5 to 15 − 10 to 0 − 5 to 5 − 5 to − 3 − 1.5 to − 0.5
qEM for Bz 3.6 2.7 2.1 4.7 3.3
Bz horizontal gradient range for most earthquakes (nT/km) 0.55–0.65 0.225–0.275 0.09–0.11 0.015–0.025 0.007–0.009
qEM for Bz horizontal gradient 4.1 3.8 4.2 2.7 3.2