利用 1984～ 1998年间期间发生在腾冲火山及邻区 30个台站记录的数千个地震的P波资料 ,采用地震层析成象法重建了腾冲火山及邻区地壳、上地幔不同深度的三维速度结构层析成象图。结果给出 ,在腾冲火山区下面地壳内约 3～ 9km存在低速带 ,扰动量达 - 10 % ;10～ 15km深度为高波速带 ,扰动量达 7 3% ;16～2 4km深度为低波速带。扰动量达 - 9 1% ;2 5～ 40km为高波速带 ,扰动量达 10 % ;大于莫霍面深度 (h≥42km)以下均为低波速带。本文所得的腾冲火山区地壳分层速度结构层析成象图是迄今为止最为详细的成象研究成果 ,其中一个重要结果是发现在火山区下不同深度存在两个高波速带 ,不是象以往报道的整个火山区下为低波速带。根据本文成析成象结果 ,结合数字化近场地震观测资料及震源力学参数特征解释 ,分析认为 ,腾冲火山区地壳不同深度存在的低速带或高速带均与火山作用的岩浆活动有密切关系。低速带可解释为与岩浆囊或半熔融热物质有关 ,高速带可解释为与地壳岩浆通道内剩留岩浆逐渐冷却固化组成的超铁镁堆积岩形成的火山核有关。本文所得的三维速度层析成象结果 ,可为研究腾冲火山喷发机理、岩浆运移系统动力成因以及火山喷发预测与预防等方面深入研究提供重要参考。 Based on the P-wave data of thousands of earthquakes recorded in Tengchong volcano and its adjacent areas from 1984 to 1998 and using seismic tomography, the three-dimensional Speed ​​Structure Tomography. The results show that there is a low velocity zone about 3-9 km below the crust in the Tengchong volcano area, with a perturbation of 10%. The depth of 10-15 km is high and the disturbance is 73%. The depth of 16-2 4 km is low band. The perturbation amounts to -91%; 25 ~ 40km is the high-speed zone, and the disturbance is up to 10%; and below the depth of the Moho (h≥42km), all are low-speed zones. The crustal velocity tomography image of the Tengchong volcanic region obtained here is by far the most detailed imaging study. One of the important results is the discovery of two high velocity bands at different depths in the volcano area, not as previously reported The entire volcano area for the low speed zone. According to the results of the imaging analysis and the digital near-field seismic observations and the characterization of the source mechanical parameters, it is considered that the low-velocity or high-velocity zones existing at different depths in the crust of the Tengchong volcano are closely related to the volcanic magmatic activity. The low-velocity zone can be interpreted as being related to magma pockets or semi-molten matter, which can be explained by the volcanic nuclei formed by ultra-Fe-Mg accumulational rocks formed by the gradual cooling and solidification of remnant magma in the crustal magma channel. The three-dimensional velocity tomography results obtained in this paper can provide important references for further study on the eruption mechanism of Tengchong volcano, the origin of magmatic migration system and prediction and prevention of volcanic eruptions.