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Table 1 Estimation of the horizontal rotation angle, θazimuth, to convert the coordinate system into a geographical one

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

Site

Rotation angle (arc-degrees)

Before Period A

After Period A

Entire observation period

NS02

− 105.85

− 105.76

− 105.79

NS03

137.18

137.39

137.21

NS04

111.33

111.27

111.31

NS05

175.59

175.71

175.70

NS06

64.40

58.81

64.36