云南地区S波速度结构具有很强的横向不均匀性。
In Yunnan region, s wave velocity structures show strong horizontal heterogeneity.
并对速度横向不均匀性及其与地质构造、地震活动的关系进行了探讨。
Then the relationship between the lateral velocity heterogeneity and geological structures and seismicity is discussed.
层面成象的结果表明：1。华北地区的地震波速度存在明显的横向不均匀性。
The results of tomography demonstrate that 1. there is significant lateral inhomogeneity in wave velocity in the North China region;
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