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本文利用FMTOMO层析成像软件以及远震P波走时数据,获得青藏高原东缘地区300km深度范围内的P波速度结构,得到以下结果:①在60～140km深度范围内,102°E～104°E、29°N～31°N,四川盆地西南部存在一个相对低速区域;②在60～140km深度范围内,沿着龙门山断裂带,在龙门山断裂带的西北侧区域出现相对高速的现象;③在190～290km深度范围内,青藏高原东缘西南区域存在着高速现象,龙门山断裂带、安宁河断裂带不再是高低速区域的分界带。
In this paper, we use the FMTOMO tomographic imaging software and teleseismic P-wave traveltime data to obtain the P-wave velocity structure in the depth of 300km in the eastern margin of the Qinghai-Tibet Plateau. The results are as follows: ① In the range of 60 ~ 140km depth, 102 ° E ~ 104 ° E, 29 ° N ~ 31 ° N, there is a relatively low velocity region in the southwestern Sichuan Basin; ② In the depth range of 60-140 km, along the Longmen Shan fault zone, relatively high velocity occurs in the northwestern region of the Longmen Shan fault zone ; ③ In the depth range of 190-290km, there is a high-speed phenomenon in the southwestern margin of the eastern margin of the Qinghai-Tibet Plateau. The Longmenshan fault zone and Anninghe fault zone are no longer the boundaries between the high and low velocity regions.