Figure 2
From: Can a single coastal tide gauge help predict internal solitary wave activity offshore

Upper panels : Synthetic Aperture Radar (SAR) images from Sentinel-1 depicting R-wave signatures. Green dots show the location of the Tarifa tide gauge Middle panels : hourly (blue curve) and 1 min sea level (SL in the legend) (orange curve) at Tarifa at the dates of the SAR images. R-waves detections are depicted with red dots. Vertical black dotted line shows the time of the SAR image. Blue dot show the low water (LW in the legend). Lower panels : Morlet wavelet decomposition of the 1min sea level signal, using a 40min period. R-waves detections are plotted in purple dots. See text for complementary information about the threshold used for detection.