Operational amplifiers and their analogues. Reference data

Encyclopedia of radio electronics and electrical engineering / Reference materials

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Random news from the Archive O formidable rocks are crushed with the roar of the wave 11.01.2005 The sound of the ocean surf, it turns out, is heard throughout the Earth. So says a professor of geology from the University of California (USA) Barbara Romanovich. In 1998, Japanese seismologists found that the Earth is constantly buzzing at a very low note, below infrasound - at frequencies from 2 to 7 millihertz, that is, one oscillation every few minutes. These tremors are very weak, but if concentrated in one focus, an earthquake of magnitude 5,7 would be obtained. Their reason remained unknown. Using two networks of seismographs - in the US and Japan, a group of scientists led by B. Romanovich followed the "hum of the Earth" for two years. To exclude loud interference, records were cut off for all days when noticeable earthquakes with a magnitude of 5,5 or more occurred anywhere on Earth. In two years, there were about 130 quiet days. Networks of seismographs, like spaced microphones, made it possible to track where this constant hum comes from. It turned out that when it's winter in the Northern Hemisphere, the noise comes mainly from the North Pacific. When it is winter in the Southern Hemisphere, the southern regions of the Atlantic and the Indian Ocean are noisy. It is the roar of winter storms that echoes across the planet.

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