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checking data obtained from the settings of the satellite monitoring of ionosphere tomography of the Earth recorded on Sakhalin Island, we found anomalies in the full electronic content of the ionosphere, which are not peculiar to this region, "Alexander Romanov told the institute.
As early as 2006, the Russian Space Systems company built a network of ground stations to monitor the ionosphere on the island of Sakhalin. Scientists analyzed changes in this upper layer of the atmosphere caused by seismic activity. Since that time, Russian satellites have more than once registered ionospheric disturbance ahead of earthquakes. Seven hours before the first tremors in Japan, scientists discovered similar anomalies over the site of the forthcoming disaster. At that time Russian experts did not know what to do with this information. Scientists thought it was premature to predict underground tremors on the basis of monitoring the ionosphere alone. They believed that this was only an indicator of some occurrences in the Earth.
Originally posted by 13star
There was an Earth directed X Class solar flare on March 9th. But remember the big quake was on the 11th.