The earthquake happened off the north eastern coast of Taiwan and was originally reported as a shallow, 6.8M earthquake. This prompted a tsunami warning for a wave of up to 1m to be issued for some parts of southern Japan, but the warnings were lifted after no significant wave activity was registered. The risk was mainly for those islands in most southern parts of the Okinawa chain of islands.
The epicenter was between Okinawa and Taiwan, about 75 kilometers from Taiwan and at a depth of 17 kilometers. No damage was recorded in Taipei, though minor shaking was felt in many office buildings.
Thankfully, it seems that this earthquake (the biggest one to threaten Japan so far this month) will have no high wave activity to follow it! Let's hope that remains the case.