Fig. 11From: Cross-validation of independent ultra-low-frequency magnetic recording systems for active fault studiesTime series recorded in voltage at nine nearby QuakeFinder stations. The pulse shown in Fig. 10a was detected at all nine QuakeFinder stations at 09:28:30 UTC, April 25, 2014. a–i Each station is labeled by station ID 802, 803, 813, 825, 855, 908, 915, 916, and 941, respectivelyBack to article page