It won't be a repeat of the Black Tsunami. It might do some damage at marinas if the energy travels that way.

to produce a damaging tsunami, that far off the coast.

Incidentally, the Japanese scientific definition of "tsunami" is just "any seismically-induced sea wave" and is not limited to catastrophic sea waves.

If it produces an underwater landslide, you bet your bippy it can produce a tsunami.

Any sea wave generated by seismic activity is a tsunami. Only a very few tsunamis, however, are catastrophic. The world's worst tsunamis since the 1960 Chilean earthquake have all been caused by quakes of magnitude 7.0 or above, with all but one being at least 7.6 . Granted, the M7.0 quake, which produced a devastating tsunami off the coast of Papua New Guinea in 1998, was accompanied by a landslide.

Magnitude 6.8
Date-Time

16 Feb 2015 23:06:26 UTC
17 Feb 2015 09:06:26 near epicenter
16 Feb 2015 15:06:26 standard time in your timezone

Location 39.848N 142.813E
Depth 10 km
Distances

77 km (48 mi) ENE of Miyako, Japan
85 km (53 mi) ENE of Yamada, Japan
94 km (58 mi) NE of Otsuchi, Japan
102 km (63 mi) NE of Kamaishi, Japan
537 km (333 mi) NNE of Tokyo, Japan

The Pacific Tsunami Warning Center said there was no tsunami threat from the quake. The Japan Meteorological Agency issued a tsunami advisory, warning of strong currents, but said no tsunami damage was expected.

http://www.cnn.com/2015/02/16/asia/japan-earthquake/index.html

I sit right on top of the San Andreas fault.