【摘要】 选取重庆、四川、湖北、湖南及贵州测震台网共25个固定台站2015年3～9月的连续地震背景噪声记录,利用互相关方法获得瑞利面波的格林函数,再用时频分析方法提取瑞利面波的群速度频散曲线,最后用面波层析成像方法反演得到重庆地区深度为5～20 km的S波速度图像。成像结果表明重庆地区浅部地壳S波速度结构存在横向不均匀性;S波速度异常与研究区内断裂构造分布有较好的相关性,基底埋深较浅的山脉地区为高值异常区。更多还原

【Abstract】 This paper selected the continuous seismic background noise records from March to September 2015 recorded by 25 fixed stations in Chongqing, Sichuan, Hubei, Hunan, and Guizhou. The cross-correlation method was used to obtain the Green’s function of the Rayleigh surface wave, and the group velocity dispersion curve of the Rayleigh surface wave was extracted by time-frequency analysis method. Finally, the surface wave tomography method was used to invert the S-wave velocity images in Chongqing with a depth of 5-20 km. The imaging results show that the S wave velocity structure of shallow crustal in Chongqing area has lateral heterogeneity. There is a good correlation between the S wave velocity anomalies of Rayleigh wave and the distribution of fault structures in the study area. The mountain area with shallow basement is a high value anomaly area.更多还原