关键词: 接收函数, 地壳厚度, 泊松比, S波速度结构, 壳内低速层, 福建地区

Abstract:

        In this paper, the receiver functions were obtained by analyzing the teleseismic P waveforms recorded by 12 broadband
temporary and 8 permanent stations  in Fujian Province. By using  the H- k stacking method,  the average crustal  thicknesses and
VP/VS  ratios were estimated. The S-wave velocity structures of 0-80 km were gained  through  the  linear  inversion method. The
H-k stacking results show that the crustal thicknesses range from 28.4 to 32.8 km, decreasing from north to south and from inland
to offshore of  the Fujian Province. Along  the NW-SE direction,  the Possion,s ratios can be separated  into several zones, and  the
Possion,s ratios  in  the coastal area are higher  than  in  the  inland area. The crust can be divided  into  three  layers:  the upper,  the middle and the lower crust. Apparently, there are differences among the crustal structures. The low velocity layers of crust appear beneath many stations. The average S-wave velocity of  the uppermost mantle  is  lower  in  the coastal area  than  that  in  the  inland area. It may imply that a heat anomaly area occurs in the deep depth.

Key words:  receiver function, crustal thickness, Poisson,s ratio, S-wave velocity structure, low velocity layer in crust, Fujian Province