Earthquake news: Series of tremors shake Pacific plate as Ring of Fire activity returns

Alaska was hit by more but weaker tremors, measuring at magnitudes of 4.2, 4.0, 3.9, 3.6, 3.5 and 3.3 while a 4.5 magnitude quake shook Japan. The earthquake activity returns after a magnitude six quakes struck 10km deep off the Northern Mariana Islands.
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