* Typhoon Hagibis moves north after hitting Tokyo
* Four dead in worst storm in decades
* 17 missing, hundreds of thousands without power
By Makiko Yamazaki and Kiyoshi Takenaka
TOKYO, Oct 13 (Reuters) - Four people were killed and 17 were missing after the most powerful typhoon to hit Japan in decades paralysed Tokyo, flooding rivers and putting millions under evacuation warning before it plowed up the northeastern coast.
Authorities lifted rain and flood warnings for the Kanto region around a becalmed Tokyo before dawn but imposed them on areas further north after Typhoon Hagibis blasted through the capital.
Attention focused on Fukushima, where Tokyo Electric Power Co overnight reported irregular readings from sensors monitoring water in its Fukushima Daiichi nuclear plant, which was crippled by the 2011 earthquake and tsunami.
Four people died in Chiba, Gunma, Kanagawa and Fukushima prefectures surrounding Tokyo, public broadcaster NHK. Among them was a man in his 60s who was found with no vital signs in a flooded apartment in Kawasaki, NHK said. Seventeen were missing early Sunday, it said.
The heavy rain caused a river in Nagano prefecture, northwest of Tokyo, to flood its banks. Some houses along the Chikuma river were nearly fully submerged in water and at least one person was rescued from the roof of a house by helicopter, NHK said. Part of a road was swept away in flooding.
Authorities issued evacuation advisories and orders for more than 6 million people across Japan as the storm unleashed the heaviest rain and winds in years. Some 80 injuries have been reported so far, while more than 270,000 households lost power, NHK said.
The storm, which the government said could be the strongest to hit Tokyo since 1958, brought record-breaking rainfall in many areas, including the popular resort town of Hakone, which was hit with 939.5 mm (37 inches) of rain over 24 hours.
Hagibis, which means “speed” in the Philippine language Tagalog, made landfall on Japan’s main island of Honshu on Saturday evening. A magnitude 5.7 earthquake shook Tokyo shortly after.
Major shinkansen bullet trains from Tokyo would begin on schedule Sunday, NHK said.
One expert, Nobuyuki Tsuchiya, director of the Japan Riverfront Research Center, told Reuters that further flooding could occur as several surrounding prefectures began releasing water from dams, letting it flow downstream.
About 1.5 million people in Tokyo live below sea level.
The Japan Meteorological Agency issued the highest alert level for 12 prefectures, warning of potential for once in decades rain totals. It lifted the alerts early Sunday.
Just last month, another strong storm, Typhoon Faxai, destroyed or damaged 30,000 houses in Chiba, east of Tokyo, and caused extensive power outages.
The capital’s main airports, Haneda and Narita, stopped flights from landing and connecting trains were suspended, forcing the cancellation of more than a thousand flights.
Many people in and around Tokyo took shelter in temporary evacuation facilities early, before the worst of the storm arrived.
Yuka Ikemura, a 24-year-old nursery school teacher, was in one such facility at a community centre in eastern Tokyo with her 3-year-old son, 8-month-old daughter and their pet rabbit.
She said she decided to move before it was too late.
“I’ve got small children to take care of and we live on the first floor of an old apartment,” Ikemura told Reuters.
“We brought with us the bare necessities. I’m scared to think about when we will have run out diapers and milk.”
The Rugby World Cup match between Namibia and Canada on Sunday in Kamaishi was cancelled. Two matches were cancelled on Saturday.
Formula One Grand Prix organisers had cancelled all practice and qualifying sessions scheduled for Saturday. (Reporting by Makiko Yamazaki, Kiyoshi Takenaka and Chang-Ran Kim; Writing by Makiko Yamazaki, Chang-Ran Kim, Billy Mallard and David Dolan; Editing by Bill Berkrot and Grant McCool)