欧亚大陆及西太平洋边缘海瑞利面波频散反演

Dispersion Inversion of Rayleigh Surface Wave in Eurasia Continent and Marginal Seas of West Pacific

从亚洲、欧洲及西太平洋地区台网113个数字地震台所记录的分布在40°W^180°E,40°S^80°N范围内近万个地震事件中,挑选出发生在1982-2005年间,震级绝大部分在5.0~7.0之间,震源深度小于100 km的1 700余个事件。共得到周期在8~400 s之间9 980余条质量较高的瑞利面波频散曲线进行面波频散反演,得到欧亚大陆及西太平洋边缘海28个周期的群速度分布图。反映了欧亚大陆及西太平洋边缘海横向和纵向存在着明显的非均匀性。

More than 1 700 seismic events（which occurred from 1982 to 2005, distributed in the range of 40°W～180°E,40°S～80°N,with magnitudes in 5.0～7.0 and focal depths shallower than 100 kin） are selected from nearly 10 000 events recorded by 113 digital seismic stations in Asia, Europe and west Pacific networks. Total 9 980 accurate Rayleigh surface dispersion curves are employed for dispersion inversion, and the distribution map of Reyleigh wave group velocity in 28 periods from 8 s to 400 s for Eurasia continent and marginal seas of west Pacific are obtained. The result shows that horizontal and vertical anisotropy exist in this region.