North Korean quake ‘suspected explosion’

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PV International desk : China’s earthquake administration said on Saturday it had detected a magnitude 3.4 earthquake in North Korea that was a “suspected explosion”, raising fears the isolated state had conducted another nuclear bomb test weeks after its last one.
An official at South Korea’s meteorological agency said they were analysing the tremor, which they put at magnitude 3.0, but the initial view was that it was a natural quake.
“We use several methods to tell whether earthquakes are natural or manmade,” said the official, who asked for anonymity. “A key method is to look at the seismic waves or seismic acoustic waves and the latter can be detected in the case of a manmade earthquake. In this case we saw none. So as of now we are categorising this as a natural earthquake.”
The earthquake was detected in Kilju county in North Hamgyong Province, where North Korea’s known Punggyeri nuclear site is located, the official said.
The Chinese administration said in a statement on its website that the quake, which occurred around 0830 GMT, was recorded a depth of zero kilometres.