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Earth, Planets and Space
Fig. 2 | Earth, Planets and Space

Fig. 2

From: Two independent signals detected by ocean bottom electromagnetometers during a non-eruptive volcanic event: Ogasawara Island arc volcano, Nishinoshima

Fig. 2

Time series of Ap index (top) and the data observed by the OBEM deployed at NS04. For the magnetic field data in the second to fifth rows, the black and red lines are the data before and after tilt correction, respectively. These magnetic field data and two components of the tilt data in the sixth row were shifted by a reference value indicated in each panel. The reference values are those at 00:00:00 on October 20th, 2016 (UTC). The bottom row shows the temperature measured near the fluxgate sensor. Yellow shades indicate Period A (November 13–19th, 2016). See also Additional file 1: Figs. S1–S4 for details on the other sites

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