A powerful 7
powerful 7.1Â-magnitude earthquake struck off Papua New Guinea on Friday and was followed by a 6.7Â-magnitude tremor, US officials said, but no Pacific-Âwide tsunami warning was sounded.
The US Geological Survey (USGS) said the first quake, originally put at 7.3 magnitude but later revised down, struck 57 kilometers (35 miles) off the town of Panguna on the remote and volcanic Bougainville island.
The second hit about an hour later 96 kilometers from Panguna, the USGS said, adding that both quakes had an estimated depth of about 50 kilometers.
Geoscience Australia estimated the first quake at 7.4 magnitude and said the tremor, which hit close to the neighboring Solomon Islands, was believed to be in the 'shallow' range.
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