Quakes with magnitudes 6.1 and 5.8 hit at a relatively shallow depth of 15 kms, about 272 kms from the town of Abepura, says US Geological Survey.
Eruption following intense seismic activity is believed to be five to 10 times bigger than last year's eruption, with about 20-50 cubic metres of magma spewing out per second.
It was one of the strongest temblors to rock Tokyo since the massive 9.0 earthquake and tsunami disaster in 2011 that killed thousands.
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