NU Online News Service, Feb. 17, 9:20 a.m. EST

The 30-year rupture probability of magnitude 6.7 earthquakes in the Kanto Plain in Japan—which includes Tokyo—may have increased from 72 percent, to between 81 percent and 93 percent since the massive Tohoku earthquake and tsunami, which killed 20,000 people, according to a study by AIR Worldwide.

AIR says its scientists have conducted a detailed analysis of whether and where the stresses relieved by the Tohoku earthquake have been transferred to neighboring faults. The information is released a new report titled, "Understanding Earthquake Risk in Japan Following the Tohoku-Oki Earthquake of March 11, 2011."

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