Fig. 2

a–c Standard deviation (SD) for September 22–30, 2020, for three components in Miyagi Prefecture. Thin and thick black outlines show the GEONET and SoftBank sites, respectively. a East–west component, b north–south component, and c up–down component. d–i Box-and-whisker plots of daily coordinate time series in Miyagi Prefecture during days 266 to 274 in 2020. The left and right columns show GEONET and SoftBank, respectively. Small circles denote outliers, defined when there was a distance of 1.5 times the interquartile range (IQR) value