Abstract:In this study, taking the seismic waveform data of 27 broadband seismic stations in Hubei, Hunan and Guangdong as examples, we improve the traditional background noise data processing, replacing the time domain and spectral whitening by eliminating seismic events and interference. After we remove instrument response, mean, trend, seismic events and interference, and band-pass filter (2.5-8 s) from the daily waveform data of a single station, the clear Lg-wave is identified from the cross-correlation and temporal stack data. We try to recover the relative amplitude of the Lg-wave by cross-correlation and stack time length correction, azimuth and geometrical spreading correction and site responses by reverse two-station method/two-event method. The research of this paper shows that the Lg-wave can be extracted from seismic background noise.