Figure 3
Tsunami wave fronts associated with the 2010 Chilean earthquake inferred from arrival times at the seafloor electromagnetometer array network.
(a) Arrival times of the tsunami (earthquake origin time: 0634 on 27 February) at the nine-station array in our seafloor network in the French Polynesia region17. White lines and white arrows show the estimated positions of the tsunami wave front at 10-min intervals and the tsunami propagation vectors, respectively, based on the arrival time at all sites. Red arrows show the propagation vectors inferred from the electromagnetic data shown in (b), which were towards N43°W at an average phase speed of 239 m/s. (b) Two-pair waveforms of the two horizontal magnetic components and the one horizontal electric component and the vertical magnetic component for all stations. These data were used to estimate the propagation vector of the tsunami, based on the theoretical relationship given by Equation (4) of the Methods.
