通过研究地表各向异性在气枪震源波速变化测量中的影响，探讨相邻台站同一时期介质波速变化的测量结果不一致的原因。研究结果表明: ①震源所在水库的形状为非规则形状，这种横向的非均匀性对分布在水库周边台站测量的波速变化影响较小；②断裂带对于地震波传播有明显的影响，相邻台站因断裂带的存在导致震相射线的路径不同，进而会影响波速变化的测量；③相邻台站的高程不同可能导致各台震相射线的路径不一致，但对波速变化测量结果影响较小。

This paper summarizes the reason why adjacent station have different wave velocity variation which measurement by air gun source in the same period. The results show that: ①The shape of the reservoir where the source located is irregular, and this lateral heterogeneity has little effect on wave velocity variation which measured by stations distributed around the reservoir; ②Fault zone has obvious influence on seismic wave propagation. Phase rays of adjacent stations have different paths when there exist fault zones. As the result, this will effect on the measurement results of wave velocity variation; ③Adjacent stations at different elevations may lead to seismic phase ray paths changed, but have little impact on the measurement results of wave velocity variation.

P315

中国地震局地球物理研究所基本科研业务费专项(DQJB21Z02)、云南省青年基金(2017K01)、云南省陈颙院士工作站项目共同资助