Earthquakes are very common in Japan. One thing to bear in mind, a lot of the earthquakes in Japan actually occur offshore in the ocean, so a big concern is tsunami.
Here are details from the BBC website, according to the report 1 fatality and 150 injured. Hmm, the
USGS website does not list it as a 7.2 but rather a 6.7 but it does list a 7.2 occuring off in the south pacific near Vanuatu.