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Between October 9 and 11, the Phillippines islands experienced nearly 10 quakes with magnitudes varying from 4.2 to 6.3 on the Richter scale.
Taiwan recorded a 5.6-magnitude quake, while Japan recorded a 5.8-magnitude temblor on October 10. Similarly, Kuril islands experienced a 6-magnitude quake yesterday, they said.
A plot of the epicentres on the tectonic map of East Asia clearly demonstrates the nuclear test released stress along the subduction zone, the geologists pointed out.
A 5.8-magnitude quake shook northern Japan on Tuesday evening, sparking fears that it was a second nuclear test by North Korea but this was proved wrong later.
Instead, seismologists detected a series of earthquakes near Japan.
Pyongyong`s first nuclear test created an artificial earthquake measuring 4.2 on the Richter scale, according to United States Geological Survey (USGS).