【摘要】 腾冲地区邻近印度板块与欧亚板块碰撞、俯冲的边界,地质环境和构造背景十分复杂,是我国地震、火山活动比较活跃的地区之一.本文采用最大熵谱反褶积方法提取腾冲地区1.0°×0.8°范围内5个流动数字地震台站的宽频带远震接收函数,反演得到台站下方0～100km深度范围的S波速度结构,分析讨论了该地区的深部构造特征.结果表明:1)腾冲地区地质结构存在明显的横向非均匀性;2)盈江断裂两侧莫霍面深度有较大差异;3)腾冲和高黎贡山之间是地壳厚度和S波速度变化的高梯度带;4)盈江断裂东南、新生破裂带以西附近地区存在明显的低速层;5)盈江断裂和新生破裂带都可能对火山区的熔融体具有阻隔作用.更多还原

【Abstract】 Tengchong Area is located at the boundary of collision and subduction zone of Indian and Eurasian plates and is influenced by many tectonic movements.With very complex geological environment and tectonic background,it is one of the seismically and volcanically active areas.In this paper,the teleseismic records are selected using the method of Maximum Entropy Deconvolution from 5 broadband temporary digital seismic stations within 1.0°×0.8° in Tengchong Area.Five stacking receiver functions are then extracted and the S-wave velocity structures under the 5 stations ranging from 0 to 100 kilometers are inversed by these receiver functions.It turns out that: 1) the geological structures in Tengchong Area show obvious lateral heterogeneity;2) the crustal thickness at the two sides of the Yingjiang Fault changes greatly;3) the area between Tengchong County and Gaoligong Mountain is a high gradient zone of crustal thickness and S-wave velocity;4) there is a low velocity zone located to the southeast of Yingjiang fault and to the west of the Newly-Generated Rupture Zone;5) the Yingjiang Fault and the Newly-Generated Rupture Zone can prevent the melt in volcanic area.更多还原