中文摘要：

云南（21-29°N,97-106°E）地处印度板块与欧亚板块中国大陆碰撞带的东缘,是中国大陆最活跃的地震活动区域之一,其地震活动频度高、震级大、分布广,属于板缘、板内地震混合型地区.本研究采用中国地震科学台阵探测在南北地震带南段布置的367个流动地震台站记录到的波形数据,人工挑选出良好约束的,ML震级〉3.0的近震P波走时数据,采用VELEST算法,联合反演得到了研究区的一维P波速度结构和震源参数.结果表明,云南地区一维P波速度模型在0和30 km之间速度介于5.96-6.60 km/s之间;在30到40 km之间的下地壳P波速度值为6.60-6.80 km/s;上地幔顶部平均P波速度为7.80 km/s,低于全球大陆速度模型均值（8.04-8.10 km/s）.基于新模型的地震活动性分析表明云南地区地震事件大多发生在中上地壳（〈20 km）,约20 km处地震活动性最强且各个震级范围地震均有发生,可能指示该深度范围活跃的构造运动和复杂的应力状态。

英文摘要：

Yunnan（ 21 - 29 N,97 - 106E）,located in the eastern edge of the collision zone of Indian plate and Eurasian plate,is one of the most active seismic region in China,and its characteristics of seismic activities high-frequency, large-magnitude and widedistribution. China earthquake science array designed 367 temporary seismic stations in Yunnan region. We adopt the recorded waveform data and manually pick out the local earthquake（ ML 3.0） P-wave travel time data of good constraint. After relocating,we apply the method of ＂the minimum one-dimensional（ 1D） velocity model＂for simultaneously inverting crustal velocity model,station correction value and earthquake location parameters. The results show that the velocity value is 5. 96 - 6. 60 km / s between 0km and30km; the P-wave velocity value is 6. 60 - 6. 80 km / s in the lowercrust between 30 km and 40 km; the velocity value is 7. 8 km / s at the top of the upper-most mantle.,but is lower than the average value of global mainland velocity model（ 8. 04 - 8. 10 km / s）.Based on the new 1D model,we calculate theoretical travel time curve,and analysis the hypocenter distribution of 108 relocated events. The result showed that the 1D P-wave velocity model and its station correction value of Yunnan can better fit the average crustal velocity structure of the region,and lay the foundation for the future study of 3D structure. Seismicity analysis showed that most earthquakes occurs in the mid-upper crust in Yunnan（ 20 km）.