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You can predict volcanic activity because there are seismic activities as close to 15 minutes before to a day before to even a week before.

You can predict earthquakes by measuring the movement of the crust by a fault zone. Seismologists also use terrestrial laser scanning equipment, which can measure changes in the ground shape, or by using a special form of radar and a technique called synthetic aperture radar interferometry. This process essentially involves the use of a radar to create a series of very accurate relief maps of the ground surface over time and then to compare the maps to create a final plot showing the changes between them, which is a record of the land surface deformation.

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10y ago

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