Abstract: Power spectrum and wavelet analysis of minute and hour value data of geoelectric field at many stations in the recent years have been completed, the results show that telluric field contains abundant periods. Periods from minutes to months all can be detected by power spectral analysis, and the power spectrum can also identify the interference frequency of the geoelectric field. Through one-dimension discrete wavelet transform, we can extrate the synchronous variation of some wave band within the same time interval at many stations, and can identify the local trend differences among different stations and interference wave bands at some stations.

Key words: Geoelectric field, Telluric field, Power spectrum, Wavelet analysis