We applied wavelet transform method to analyze the deformation observation in Liaoning char-acteristics of the detailed part of signal variation after wavelet decomposition.The research results indicate that: the detailed decomposed signal characteristics of wavelet were different when the scale was differ-ent,it can identify and extract some anomalies from raw data before the earthquake.It is consideranly possible that moderate strong earthquake will occur in the range of about 250 km from the observation point when the annually periodic feature is broken or the detailed singnal variation exceeds the double mean square error and the scale is 3.
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