Crustal thickness and v_P/v_S ratio and their tectonic implication in Jilin Province

Using data on crustal thickness and the v_P/v_S ratio calculated from teleseismic waveforms recorded at five temporary stations and collected from previous studies in Jilin Province, we analyzed the crustal structure in different geological units. The results show that the average crustal thickness in Jilin Province is 32.57 km with thinner crust in the middle; the average v_P/v_S is 1.768 with higher values in the eastern region; crustal thickness in Changbai Mountain area is higher than that in the Songliao Basin, whereas the v_P/v_S ratio is lower than that in the Songliao Basin. The crustal thickness in the Changbai Mountain area is thin in the west, the v_P/v_S ratio shows small variation, and the thin crust with the high v_P/v_S ratio appear in the volcanic eruption area. In the Songliao Basin area, the crust is thin in the east with a high v_P/v_S ratio, whereas the Songyuan and Qianguo areas with dense earthquakes exhibit substantial lateral changes in crustal thickness and high v_P/v_S ratios. The thinnest crust and the highest v_P/v_S ratio is found in the Songyuan area in Jilin Province.