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Japan's earthquake moves the Earth's axis 15 cm

The day length was shortened by 1.8 millionths of a second.

Richard Gross, a scientist at Jet Propulsion Laboratory, NASA, has found that after the earthquake in Japan last Friday , the Earth's axis has moved about 15 centimeters, twice during the earthquake in Chile, 2010 . "According to my calculations," says researcher-day length was shortened by 1.8 millionths of a second. " A time when we must add the 1.2 millionths of a second we lost after the Chilean earthquake.

Initial data suggested on Friday that the earthquake displaced 2.4 meters on the island of Honshu, the main archipelago, and moved the axis of the earth about ten centimeters. But further analysis and more detailed have raised that figure to 15 centimeters which has a direct impact on the length of days . At first he said that as a result of the earthquake's days were shortened by 1.6 millionths of a second. Now experts believe they have been shortened by 1.8 millionths of a second and warn that further study could again change these quantities.

A terrestrial day lasts about 24 hours, or what is the same, about 86,400 seconds. Throughout the year, this time varies by about a millisecond (or billionths of a second), due to variations in the distribution estcionales mass the planet. In addition, the Earth does, naturally, its own mass redistributions, most of which occurs as a consequence of the interactions of tectonic plates .