Observed travel-time curves by stacking records from Lanzhou small aperture seismic array

Based on the past 10 years vertical observational waveforms recorded by Lanzhou small aperture seismic array, which is located at the northeastern margin of the Tibetan Plateau, the observed travel-time curves are obtained by using STA/LTA technique. The results show that Lanzhou seismic array can record events with different epicentral distances between 0—180° and with different azimuths due to its particular location. By stacking the seismic records filtered with different frequencies, we can get corresponding observed travel-time curves so as to identify different body wave phases, such as P, PKIKP, PKP, PP, PPP, PcP, ScP, S, SS, and to study the characteristics of travel-time curves. It is of scientific significance to identify various seismic phases and further study fine structure of the Earth’s interior.