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Fig. 4 | Earth, Planets and Space

Fig. 4

From: Triggered tremors beneath the seismogenic zone of an active fault zone, Kyushu, Japan

Fig. 4

An example of our polarization analysis. a Three-component seismograms observed at station “YAKQ", bandpass-filtered at 2–8 Hz. b Directions of particle velocity motion (open circles). Blue circles represent extracted data with high rectilinearity and S/N ratios. c Rectilinearity (black line) and signal-to-noise ratio (red line). d Azimuthal projection of cumulative numbers of the determined polarization directions. Blue and gray segments indicate extracted data and other data, respectively. Red and orange bars denote the azimuth toward the epicenter and the estimated polarized direction, respectively. e Same as d, except for plotting the azimuth parallel to b. Orange line in Fig. 4e indicates the cumulative number of the polarization directions for azimuthal fractions at a 2° interval

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