Fig. 2

Traveltime delay and initial phase reversal of the tsunami generated by the 2011 Tohoku-Oki earthquake, denoted by the yellow star. Red triangles indicate the location of DART stations. Observed and conventional synthetic tsunami waveforms are compared at near field (1 h traveltime) and far field (17 h traveltime). Contour lines of the traveltime are drawn at every 1 h. At the near field, the waveforms match well. At the far field, the observed waveform shows a reversed initial phase and traveltime delay relative to the conventional long-wave tsunami simulation