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Earth, Planets and Space
Fig. 6 | Earth, Planets and Space

Fig. 6

From: Cross-validation of independent ultra-low-frequency magnetic recording systems for active fault studies

Fig. 6

Comparisons of amplitude spectra between different times of day and between different instruments. a Zonge ANT4 north-oriented coil averaged over 1 h at four different times during April 19, 2014. Solid lines show data filtered from 200 s to 10 Hz. Dashed line is the average spectrum over the whole day, without a low-pass filter (but still with 10 Hz anti-alias filter). b Amplitude spectra of Zonge ANT4, QFido3, and EMI BF4 coil magnetometers during the “quiet period” (02:00–03:00 local time) on April 19, 2014, also compared with the fluxgate magnetometer at the Fresno (FRN) observatory

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