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Signals from the seismic stations make their way to EarthquakesCanada data centres via various electronic means. Essentially, each station has its own computer system that digitizes the data from its seismometer and transmits the digital data via one or more of satellite, terrestrial microwave, UHF radio, telephone modem, or the Internet. If any of the components in the system should fail, or become degraded by atmospheric or other disturbances, there will be a loss of signal or some form of noise introduced. The computer system at the station also calibrates itself whenever it is restarted, which can can generate a strange but easily recognized transient burst