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Earth, Planets and Space
Fig. 4 | Earth, Planets and Space

Fig. 4

From: Development and examination of new algorithms of traveltime detection in GPS/acoustic geodetic data for precise and automated analysis

Fig. 4

Analysis process of the peak subtraction (PS) method. a Synthetic correlogram made by taking an autocorrelation of the synthetic signal. (b–e, f–j, k–o) Progress of correlograms during PS procedure against shots #405, #486, and #568 at G06-1. Firstly, a local maximum peak over the threshold (in case the C min = 0.15, green broken line) was detected on the observed correlogram (b, f, k), and then, the synthetics was subtracted after being normalized by a maximum peak on the observed correlogram (c, g, l). Subsequently, a similar process was iterated until the local maximum peak over a threshold disappeared (d–f, i–k, n–p)

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