On 17 November, the Earth Observing satellite (EO-1) NASA has flown over and photographed the Krakatoa, the Indonesian volcano known for its large eruptions, such as the late nineteenth century, which caused the sound the most intense ever heard on this planet, capable of being understood even five thousand miles away from the crater.
The Krakatoa is still active and emits a frequency high pinnacles of smoke and ash, as shown by the photograph. For this reason, the volcano is constantly monitored by NASA with an automatic system mounted on EO-1, which shall make the same with hundreds of other terrestrial volcanoes considered potentially dangerous or particularly attivi.Nel summer and autumn of this year, Krakatoa has created hundreds of eruptions showing a new phase of activity that is only now starting to slow down. The image was taken by the Advanced Land Imager, a sensor on EO-1 and part of the project SensorWeb Volcano. In practice, when another satellite detects the presence of volcanic activity, the NASA satellite aims its tools to the volcano in question and take some pictures, which are then used to research centers to monitor eruptions and study their characteristics. Another sensor, installed on more EO-1, can detect the texture of volcanic clouds and also the position and temperature of the lava flows coming out from the craters.
When Krakatoa erupted on August 27, 1883 caused the destruction of 165 villages and killed at least 36mila people. The clouds of ash reached the 36 km high, and the violence of the eruption was equal to that of 200 megatons (200 million tons of TNT), over 13 thousand times more powerful than the atomic bomb dropped on Hiroshima in 1945.
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