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Earth, Planets and Space
Fig. 3 | Earth, Planets and Space

Fig. 3

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

Fig. 3

Tilt variation for each site in the observation period. z′ axis is projected in the horizontal plane and plotted by stars colored with the days from October 20th, 2016. Days shaded in the color scale correspond to Period A (November 13–19th, 2016). Insets are magnifications of z′. The horizontal axes x″ and y″ after the tilt correction are plotted by arrows. The angle between x″ and x is θazimuth as shown by a blue arc with an arrow. For NS06, x″, y″, and z′ are obtained for before and after Period A (denoted with subscripts “bA” and “aA”, respectively). In the top right panel, the tilt variation between November 13th and 19th for each site (except for NS06) is plotted as a red vector on the bathymetry map (Black line indicates the island coast.). Yellow vectors are the tilt variations predicted by a spherical pressure source model and the yellow circle indicates the horizontal location of the pressure (deflation) source with the radius of 1.2 km

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