7.3 magnitude earthquake off Japan prompts Fukushima plant evacuation

An earthquake of 7.3 magnitude has hit 231 miles (371 kilometers) east of Japan’s Honshu Island with tremors felt in Tokyo. The quake prompted an evacuation at the devastated Fukushima Daiichi plant and sent tsunami fears across 5 prefectures.

The quake struck at a depth of 10 kilometers at 17:10 GMT, 320 kilometers southeast of Ishinomaki in Miyagi Prefecture, according to the US Geological Survey. Strong tremors could be felt on Japan’s main Honshu Island, as well as on the northern island of Hokkaido. 

A tsunami advisory was issued following the quake. The wave was due to hit at 17:42 GMT in the Fukushima region, the Japanese Weather Agency predicted. The agency issued a "yellow" warning meaning the tsunami was not expected to exceed a height of 1 meter. 

Local media reports, that some 6,000 households were urged to evacuate in Kamaishi, Iwate Pref. amid tsunami fears.

So far, a small tsunami of about 1 ft. (30 cm) was observed in Ishinomaki City, Miyagi Prefecture, meteorologists said. However, local NHK warns that tsunami could become stronger and higher.

Breaking: 30 cm (1-foot) tsunami detected at Ayukawa, Miyagi at 3:07 a.m. local time - NHK.

— Hiroko Tabuchi (@HirokoTabuchi) October 25, 2013

According to NHK news, a Tsunami measuring 1.8ft (55cm) has been also detected at Onagawa Nuclear Power Plant in Miyagi. The plant management said the facility is able to withstand a 17m (55ft) tsunami.

Besides Fukushima, the tsunami might affect four more prefectures: Iwate, Miyagi, Ibaraki and Chiba.

Japan's Met Agency has revised up its magnitude reading to 7.1 for quake off Fukushima coast. Shaking intensity map: pic.twitter.com/B1rXp3u1Ca

— Hiroko Tabuchi (@HirokoTabuchi) October 25, 2013

Tokyo Electric Power Company (TEPCO) has ordered the evacuation of workers from near the sea wall at Fukushima Daiichi nuclear power plant following the earthquake, local NHK reports. 

Ships have been seen leaving a port south of the Fukushima Daiichi nuclear power station, Reuters reports.

People in coastal regions around the Fukushima Prefecture coastline have been advised to move to higher ground. 

"Marine threat is in place," the Japan Meteorological Agency said. "Get out of the water and leave the coast immediately." 

There were no immediate reports of damage on land from the quake. No abnormalities were reported at the Fukushima Daiichi plant as well. 

A spokesman at TEPCO, operator of Fukushima, said that there was no damage or change in readings at radiation monitoring posts around the plant.

The Pacific Tsunami Warning Center also said that "based on all available data a destructive pacific-wide tsunami is not expected and there is no tsunami threat to Hawaii.”