福建地区地壳上地幔S波速度结构与泊松比

        利用在福建地区布置的 12 个宽频带数字地震流动台站和 8 个固定台站记录的远震 P 波波形数据进行接收函数计算,运用H-k 搜索叠加方法得到了研究区的平均地壳厚度H 与波速比k（=VP/VS）,并运用接收函数反演方法得到了 0~80 km 范围内的地壳和上地幔 S 波速度结构。H-k 叠加结果表明,福建地区地壳厚度在 28.4~32.8 km 范围内,从内陆到沿海变薄,从南到北变厚;沿着 NW-SE 方向,泊松比分布有分带特征,沿海地区泊松比高于内陆地区;同时表明,该地区地壳可分为上、中、下地壳,地壳结构横向差异较明显,多个台站下方可发现壳内低速层,沿海地区上地幔顶部平均速度相对低,可能暗示了深部存在热异常区域。

S-Wave Velocity Structures of the Crust and Uppermost Mantle,and Possion's Ratios in Fujian Province

        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.