Several earthquakes hit northwestern Japan

OJIYA, Japan -- A series of powerful earthquakes and aftershocks rattled northern Japan on Saturday, killing at least 15 people and injuring more than 700 as buildings crumbled, a bullet train derailed and roadways were torn apart.

At least 10 people were missing Saturday night. Throughout the region, electric, gas and telephone services were knocked out and water and sewage mains burst.

The quakes -- the most powerful recorded as magnitude 6.8 -- were spread over several hours and centered on Ojiya, about 160 miles northwest of Tokyo. Still, buildings swayed in the Japanese capital.

The first quake hit at 5:56 p.m. and was centered about 12 miles beneath the surface, the Meteorological Agency said. At least six more tremors hit over the following hours, including quakes of magnitude 6.2 and 5.9, the agency said.

The second floor of a Jusco nationwide supermarket chain store was smashed.

"There were 300 customers inside when the earthquake hit, and everyone tried to grab something nearby to keep from being knocked off their feet," said Reiko Takahashi, the store's manager as she stood guard to prevent looting or possible injuries. "Several people were hurt by glass shards and falling debris."

Teams were dispatched to assess damage and aid residents but darkness and buckled roads hampered their efforts, officials said. Eleven military helicopters fanned out to check the damage and help with rescue operations, the agency said.

The quakes were centered in relatively rural areas. The government has estimated that some 7,000 people would die if such a powerful quake hit the Tokyo area.

Nearly 50 people were injured by flying glass or items that fell from shelves in Tokamachi and Ojiya cities, according to media reports.

Kyodo News put the death toll at 15 and the injury toll at over 700, based on surveys of local hospitals. Doctors were treating the wounded in hallways and reception areas.

Elsewhere, sewage and water mains burst, gas and telephone services were down, and about 280,000 homes lost power, officials told Japanese media.

A major nuclear power plant operated by Tokyo Electric in Kashiwazaki was operating normally.

In the Niigata region, 42,000 people evacuated to emergency shelters, Kyodo reported.

Television footage from Ojiya showed overturned cars scattered about a 33-foot crater carved out of an uprooted highway.

The jolt triggered an automatic safety device that temporarily halted train services, according to media reports. Railway officials said at least two trains, including a bullet train, derailed and some cars tipped over in Niigata prefecture, but nobody appeared to be hurt.

The temblors came just days after Japan's deadliest typhoon in more than a decade, which left 79 dead and a dozen others missing.

Typhoon Tokage ripped through the country with high waves and rapid mudslides, demolishing homes and flooding dozens of communities in western Japan before losing power and disappearing over the Pacific Ocean.

Japan, which rests atop several tectonic plates, is among the world's most earthquake-prone countries. A magnitude 6 quake can cause widespread damage to homes and other buildings if centered on a heavily populated area.