A strong earthquake rattled Japan’s northern island of Hokkaido early on Monday, US and Japanese meteorological agencies reported, the latest in a series of powerful tremors to hit the island nation.The 6.2-magnitude quake struck at 5.23am in Hokkaido’s southern region, at a depth of 83km (52 miles), the Japan Meteorological Agency (JMA) reported, revising its preliminary estimate of magnitude 6.1.No tsunami alert was issued, JMA said, and the US Geological Survey predicted that damage to...