After the devastating earthquake off the coast of Japan a gigantic vent of hundreds of kilometers long was formed on the ocean floor. According to geologists, this phenomenon could lead to powerful tremors in the Tokyo area.
According to the calculations of one of the NASA laboratories, the disaster in the Land of the Rising Sun was accompanied by changes in the structure of tectonic plates. One of them shifted by about nine meters, giving rise to a huge collapse in the Japanese coast. American scientists have found that it reaches a length of 380 kilometers and the width - 190 km.
Geologists from the U.S. indicated that as a result this increased pressure on nearby segments of the tectonic plates. This increases the threat of earthquakes in the Tokyo area. Note that Japanese capital is on the unique place that converge multiple fault lines. It was recalled that this particular phenomenon has caused a devastating earthquake in the middle of the XIX century, killing seven thousand people. Scientists said today the power of new aftershocks will reach magnitude 7.5.
According to observations of the researchers, these events were observed in recent years. For example, in 2004 there was the strongest earthquake, which was accompanied by a powerful tsunami that struck many Asian countries. And three months after this was recorded a new tremor of force over eight and a half points in the sparsely populated island of Nias.
Specialists also noticed that as a result of recent earthquake the height above the sea of the north-eastern lands of Japan has decreased. Because of this the coastal areas are now in danger of flooding, strong tides, which are now distributed on a much larger space than before. According to researchers in the past of Japan has repeatedly been subjected to the devastating tsunami, as evidenced by sand deposits in different areas.
Aggravates the situation the fact that Japan has become a somewhat lower relative to sea level, and that sooner or later lead to flooding.
"The quake moved portions of northeast Japan by as much as 2.4 meters (7.9 ft) closer to North America, making portions of Japan's landmass "wider than before," according to geophysicist Ross Stein. Portions of Japan closest to the epicenter experienced the largest shifts. Stein also noted that a 400-kilometer (250 mi) stretch of coastline dropped vertically by 0.6 m (2.0 ft), allowing the tsunami to travel farther and faster onto land. The Pacific plate itself may have moved westwards by up to 20 m (66 ft), though the actual displacement will have diminished with greater distance from the site of the fault. Other estimates put the amount of slippage at as much as 40 m (130 ft), covering an area some 300 to 400 km (190 to 250 mi) long by 100 km (62 mi) wide."