Strong quake hits off east coast of Honshu, Japan

An earthquake measuring 6.1 on the Richter scale jolted off the east coast of Honshu, Japan Thursday at 23:58 local time, the U.S. Geological Survey said.

Workers enter Japan reactor for 1st time since blast

Japanese workers entered the No.1 reactor building at the crippled Fukushima Daiichi nuclear plant for the first time since a hydrogen explosion ripped off.

Casualties

Death Toll:  13,116

Missing:  14,377

Evacuated:  270,000

Nuclear plant situation

Fukushima No. 1 power plant:

No.1 reactor: power source available

No.2 reactor: blackish smoke rose

No.3 reactor: white smoke rose 

No.4 reactor: succeeded in putting water 

Huge Japan quake causes tsunami, fires, landslide

A massive 9.0 magnitude quake hit northeast Japan Friday, causing many injuries, fires and a four-meter (13-ft) tsunami along parts of the country's coastline, NHK television and witnesses reported. More>>

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Scale of nuclear accidents

Level 7 - Major release of radioactive material. Example: Chernobyl, Ukraine, 1986

Level 6 - Significant release of radioactive material. Example: Kyshtym, Russia, 1957

Level 5 - Limited release of radioactive material. Example: Three Mile Island, US, 1979, and Windscale, UK, 1957

Level 4 - Minor release of radioactive material with at least one death from radiation. Example: Tokaimura, Japan, 1999

Level 3 - Exposure in excess of 10 times the statutory annual limit for workers

Level 2 - Exposure of a member of the public in excess of 10mSv (average annual dose is 1mSv)

Level 1 - Exposure of a member of public above statutory annual limit. Minor safety problems