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I don't have a name for it, but I heared that volcanoe scientists put GPS receivers on volcanoes and monitor the position data by a radio link. To achieve extreme accuracy, many measurements are made over an extended period of time, and by use of the Gaussian probability the actual position thus is determined more accurately than 10 cm. (This is even more accurate than military GPS position measurements, where there is never that much time for the many measurements needed for this kind of accuracy.) Position changes of volcanoe surfaces are normally very slow. Any larger than usual movements of the position however will cause an alarm somewhat earlier than an actual large eruption that may follow.

Hans J.

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15y ago

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