In April 2023,during daily observation of the earthquake warning curve,it was found that the curve of the Hannan basic station was abnormal,showing a spindle shape.By referring to relevant materials and discussing and analyzing,a preliminary investigation plan has been formulated.After a series of investigation steps,it was ultimately determined that the interference was caused by the sewage discharge from the water plant near the basic station.This fault is quite special and can provide experience for the operation and maintenance of the seismic system,improving the efficiency of operation and maintenance.
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