Tens of thousands of Japanese households remain without power after a powerful earthquake left at least four dead and more than 100 injured
Supply-chain disruptions could put more pressure on already strained global output of smartphones, electronics and cars.
The tremor revived memories of the 11 March 2011 disaster in the same area, and left Shinkansen bullet train service indefinitely suspended, with at least one major highway to the region closed for safety checks.
Parts of building facades tumbled into streets below in some areas, and television footage showed a steep tiled roof crumpled over a parked, crushed car and workers examining cracked highways.
Some 24,270 households serviced by Tohoku Electric Power Co in northeast Japan remained without electricity on Thursday, although the firm said it expected most will have supply restored later in the day.
Prime Minister Fumio Kishida said four people had died and that the government would be on high alert for the possibility of further strong tremors over the next two to three days.
At least 107 people were reported injured, several of them seriously, with 4,300 households still without water by mid-morning.
The quake, initially measured at magnitude 7.3 but later revised up to 7.4 by the Japan Meteorological Agency, hit at 11.36pm on Wednesday just off the coast of Fukushima prefecture at a depth of 60 kilometres.
A tsunami warning was issued but cancelled early on Thursday morning. Some areas reported a rise in the sea level, but no serious damage was immediately reported.
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