In a bid to avoid the worst of the Japanese capital's blazing summer, fans, athletes and volunteers will have to get going at the crack of dawn.
Japan has developed a swimming robot that began an underwater probe inside one of Fukushima's tsunami-destroyed nuclear reactors to look for traces of melted fuel.
Only a handful of reactors have come back online, due to public opposition, since the Fukushima disaster in 2011. Tuesday's move comes after court clearance.
No injuries or casualties were reported after the 6.9 magnitude quake struck near Fukushima.
Heavy rain drenched the Japanese capital on Monday as Typhoon Mindulle swept in, bringing floods that suspended train services and high winds that forced airlines to cancel hundreds of flights.
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