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Originally posted by TrueAmerican
That article was up on NHK's site a couple days ago, but don't see it now.
P-waves move faster than S-waves, and so they take advantage of the brief warning time.
The Japanese government's nuclear safety agency has decided to raise the crisis level of the Fukushima Daiichi power plant accident from 5 to 7, the worst on the international scale.
The Nuclear and Industrial Safety Agency made the decision on Monday. It says the damaged facilities have been releasing a massive amount of radioactive substances, which are posing a threat to human health and the environment over a wide area.
The agency used the International Nuclear and Radiological Event Scale, or INES, to gauge the level. The scale was designed by an international group of experts to indicate the significance of nuclear events with ratings of 0 to 7.
On March 18th, one week after the massive quake, the agency declared the Fukushima trouble a level 5 incident, the same as the accident at Three Mile Island in the United States in 1979.
Level 7 has formerly only been applied to the Chernobyl accident in the former Soviet Union in 1986 when hundreds of thousands of terabecquerels of radioactive iodine-131 were released into the air. One terabecquerel is one trillion becquerels.
The agency believes the cumulative amount from the Fukushima plant is less than that from Chernobyl.
Officials from the agency and the Nuclear Safety Commission will hold a news conference on Tuesday morning to explain the change of evaluation.
Tuesday, April 12, 2011 05:47 +0900 (JST)
Originally posted by missvicky
I gotta say this is one of the slowest pins and needles events I've ever experienced!
The March 11 quake was so strong that a Japan Coast Guard monitoring instrument on the floor of the Pacific Ocean near the epicenter moved 24 meters, or about 79 feet, eastward. The city of Sendai, whose airport was inundated by the tsunami, moved about 13 feet, according to Shinji Toda, a professor at Kyoto University.
Such large movements have shifted stresses in the earth, increasing the likelihood of quakes on some fault lines while reducing the likelihood on others, including the one involved in the 1923 Tokyo earthquake.
In the month since the March 11 earthquake, there have been frequent aftershocks at and around the initial quake's focus, including many strong quakes with a magnitude of 5 or higher. Experts say there are more shocks to come, possibly as strong as magnitude 8.
The apparent southern boundary of the aftershock zone from the March 11 earthquake is off the shore of eastern Chiba Prefecture. In that area, the Pacific plate and the Philippine Sea plate slide under the landward plate that includes eastern Japan. Tuesday's earthquake off Chiba occurred because faults in the landward plate became active. Movements of the Philippine Sea plate affect seismic activity in Tokyo Bay. But only a few earthquakes at the magnitude-3 or magnitude-4 levels have been recorded there since March 11, according to the agency. The level of seismic activity has not changed much. However, Prof. Koshun Yamaoka of Nagoya University pointed out that seismic activity in northern Chiba and southern Ibaraki Prefectures, which is also linked to the Philippine Sea plate, has increased. "An earthquake could hit the Tokyo metropolitan area with its focus directly below the city. We'll have to observe the situation carefully," Yamaoka added.