2011 Tōhoku earthquake and tsunami additional power, because TEP's power plants were also damaged in the earthquake. Kansai Electric Power Company (Kepco) cannot share electricity, because its system operates at 60 hertz, whereas TEPCO and TEP operate their systems at 50 hertz; this is due to early industrial and infrastructure development in the 1880s that left Japan without a unified national power grid. Two substations, one in Shizuoka Prefecture and one in Nagano Prefecture, were able to convert between frequencies and transfer electricity from Kansai to Kanto and Tōhoku, but their capacity to do so is limited to 1 GW. With the damage to so
2011 Tōhoku earthquake and tsunami it is also assessed that a tsunami-earthquake with a tsunami magnitude scales (Mt) between 8.6 and 9.0 (Similar to 1896 Sanriku earthquake, the Mt for the 2011 Tōhoku earthquake is 9.1–9.4) will have a 30% chance to occur within 30 years. The quake gave scientists the opportunity to collect a large amount of data so as to model in great detail the seismic events that took place. This data is expected to be used in a variety of ways, providing as it does unprecedented information about how buildings respond to shaking, and other effects. Gravimetric data from the quake has