A major earthquake hit the eastern part of Hokkaido at 3:42 of 1/9/2015 (JST) according to Japan Meteorological Agency.
The magnitude was 5.4. The depth of epicenter was 120km.
The maximum seismic intensity was 4.
In 2014, perceptible earthquakes occurred for 2,045 times. (cf, Perceptible earthquake hit Japan for 2,045 times in 2014 [URL])
From the report of Japan Meteorological Agency, the distribution of seismic intensity stopped exactly at the northern border of Fukushima prefecture for some reason.Iori Mochizuki