Following up this article..M6.0 hit Aomori
Japan Meteorological Agency held a press conference on 5/24/2012.
They announced the M6.0 of earthquake to hit Aomori was not an aftershock of 311.
They warned about aftershocks of scale 4 level for the following one week.
According to Nuclear and Industrial Safety Agency, there was no damage in Rokkasho reprocessing plant.
Iori Mochizuki