An earthquake prediction is a prediction that an earthquake of a specific magnitude will occur in a particular place at a particular time (or ranges thereof). Despite considerable research efforts by seismologists, scientifically reproducible predictions cannot yet be made to a specific day or month. However, for well-understood faults the probability that a segment may rupture during the next few decades can be estimated. Scientists still do not know many of the details of the physical processes involved in earthquakes and how to predict them. The theory of plate tectonics was born in the mid 1960s and confirmed in the early 1970s. Many phenomena are considered to be possible precursors of earthquakes, and among those under investigation are seismicity, changes in the ionosphere, various types of electromagnetic indicators including infrared and radio waves, radon emissions, and even unusual animal behavior.
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