【摘要】 利用2002年1月至2008年12月天津地震台网产出的初至P波走时资料,通过震源与速度结构联合反演算法,计算出天津及邻近地区三维P波速度结构的优化模型,同时获得1 738次中小地震的重新定位结果。结果表明,天津及邻近地区中小地震分布具有与强震相同的地壳深部介质背景,主要分布在高低速度过渡带;天津及邻近地区中小地震震源深度重新定位后更集中分布在10-15 km深度范围内。更多还原

【Abstract】 Using the P wave travel times recorded at Tianjin local networks date from January 2002 to December 2008,we implemented a joint inversion of earthquake location and velocity structure,and got the new locations of 1 738 medium and small earthquakes in Tianjin and neighboring areas.The results suggest that the distribution of small earthquakes in Tianjin and neighboring areas has the same structure in deep crust as strong shock and most of small earthquakes locate the transition zone between high-velocity and low-velocity.The focal depth is mainly distributed between 10 km to 15 km after relocation of small earthquakes in Tianjin and neighboring areas.更多还原