Figure 3
From: Rewinding the waves: tracking underwater signals to their source
(a) Distance probability density function for EQ1, EQ2 and the impact event. These are calculated by using multiple pairs of (ω n , t) in order to address noise in the signals. The peaks in the PDF show the highest probability distance from HA01 which closely match the earthquakes location, shown in dashed lines. (b) EQ1 signature from the hydrophone’s channel 1 (above) and its time-frequency spectrogram (below). The spectrogram shows the points in the time-frequency plane where most of the energy is contained. By overlaying the direct problem frequency content for modes 1 to 3, the modes are compatible with a source distance between 1500 km (cyan solid lines) and 2600 km (white dashed lines).
