According to NOAA: The Honshu tsunami was generated by a Mw 8.9 earthquake (38.322*N, 142.369*E ), at 05:46 UTC, 130 km (80 miles) E of Sendai, Honshu, Japan (according to the USGS). In approximately 25 minutes, the tsunami was first recorded at DART(R) buoy 21418. Forecast results shown below were created with the NOAA forecast method using MOST model with the tsunami source inferred from DART(R) data.
A whirlpool caused by currents from a tsunami near the port of Oarai after Japan was struck by a strong earthquake off its north-eastern coast today. The disaster comes two days after online warnings that the movement of the moon will trigger tidal waves, volcanic eruptions and earthquakes. the Telegraph