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Earth, Planets and Space
Fig. 10 | Earth, Planets and Space

Fig. 10

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

Fig. 10

Comparison of individual pulses as recorded on different systems, plotted as in Fig. 9b, but for shorter time periods (pulses are 1–10 s in duration). a Single-side pulse recorded on all magnetometers at JRSC (Zonge ANT4, QFido3, EMI BF4) but not in Fresno, ~ 225 km distant. b Two-sided pulse recorded on all QuakeFinder sensors (Zonge ANT4, QFido3) but not on USGS-Stanford coils, ~ 50 m distant. c Pulse recorded only on USGS-Stanford north coil, but not on east coil ~ 5 m distant, nor on QuakeFinder sensors. d Signal seen on QuakeFinder QFido3 sensor, but not on Zonge ANT4 coil ~ 5 m distant, nor on USGS-Stanford EMI magnetometers. Traces from different sensors are all plotted at the same scale, but shown offset vertically for easier comparison. Where two components of the same instrument are shown (Zonge ANT4 N and E in b and d; EMI BF4 N and E in c) they are overlain without offset

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