Image of Crust and Upper Mantle Velocity Structure along the Array from Fuyun to Kuerle by Seismic Tomography
Image of Crust and Upper Mantle Velocity Structure along the Array from Fuyun to Kuerle by Seismic Tomography
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发表时间：
2006
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通讯作者：
Wang Ya-jun
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作者：
Wang Ya-jun
利用富蕴-库尔勒直设台站连续记录的两年地震资料，用地震层析成像技术提取P波到时，得到地壳上地幔结构图像。反演结果表明，塔里木板块北部的挤压作用比西部的挤压作用弱。造山带作用在西部强烈，向东逐渐减弱。天山山脉下造山带深度小于100 km。地震活动集中在这个深度范围内。部分岩石圈物质在漂移趋势中发生了变化，并向东迁移，从而减弱了天山的隆升活动。因此，天山的东西部存在着差异。天山下剖面莫霍面结构复杂，具有交叉、超覆的特点。天山地区莫霍面深度达80 km，准噶尔盆地及塔里木盆地北部莫霍面深度达40~50 km。
From two years seismic data continuously recorded by stations directly set up from Fuyun to Kuerle, P_arrival times were picked and image of crust and upper mantle structure was given with the technique of seismic tomography. The inversion shows that the extrusion to north of Tarim plate in this profile is more weaken than that in the west. The orogen effect is intense in the west and becomes weak gradually to east. Moreover, the depth of orogeny is less than about 100 km under Tianshan Moutain in this profile. The earthquake activity converged this range in depth. The part of lithosphere substance changed in the floating tendence was moved to east, which decreased the uplift activity of Tianshan Moutain. As a result, there is difference between the west and the east of Tianshan Mountain. Under the Tianshan Mountain in this profile, the structure of Moho is complicated with the characteristic of cross and overlap. The depth of Moho in the Tianshan Mountain area extends to 80 km, and the depth under Junggar basin and north part of Tarim basin is 40～50 km.