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Earth, Planets and Space
Figure 4 | Earth, Planets and Space

Figure 4

From: Imaging the hydrothermal system beneath the Jigokudani valley, Tateyama volcano, Japan: implications for structures controlling repeated phreatic eruptions from an audio-frequency magnetotelluric survey

Figure 4

Polar histograms for phase-tensor ellipse principal axis directions at all sites. Histograms for (a) all frequency bands, (b) lower frequency bands (1 to 100 Hz), and (c) higher frequency bands (100 to 10,000 Hz) are shown. Sector width is 5°, and the radial scale is normalized by the maximum value. Note that the directions have an intrinsic ambiguity of 90° as discussed in the main text.

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