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Whatever the mechanism of electrification in the source region, dynamic processes in association with pre-EQ microfracture can lead to the generation of current systems.
(17) It seems that the pre-EQ criticality has taken place in a wide area of the lithosphere, and the criticality is also recognized in the lower ionosphere with a small time difference of one day or so.
Automixers can be selected on a channel-by-channel basis to be placed in the signal path pre-EQ, prefader, or postfader.