Additional file 26: of Spatio-temporal changes in the seismic velocity induced by the 2011 Tohoku-Oki earthquake and slow slip event revealed from seismic interferometry, using ocean bottom seismometer’s records

Temporal variations in seismic velocity at S22. These figures show the temporal velocity changes calculated from the phase delays at each lapse time: from 10 to 20 s, 20–30 s, 30–40 s, 40–50 s, 50–60 s, and 60–70 s. The four colors of broken lines correspond to the occurrence of each low-frequency tremor and to the main shock. (PDF 59 kb)