Figure 4From: Observation of ionospheric disturbances induced by the 2011 Tohoku tsunami using far-field GPS data in HawaiiThe sea-level tsunami series and time-frequency diagrams. Panel (a) is the coastal tide gauge in Nawiliwili, and panel (b) is the DART 51407 buoy. Panels (c) and (d) are corresponding time-frequency diagrams.Back to article page