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The other main law describing aftershocks is known as Båth's Law and this states that the difference in magnitude between a main shock and its largest aftershock is approximately constant, independent of the main shock magnitude, typically 1.1–1.2 on the Moment magnitude scale.
"This quake is an aftershock of the 2011 quake that hit the Tohoku region," Japan Meteorological Agency (JMA) seismologist Yasuhiro Yoshida told reporters.