摘要
利用在2002-2004年新疆天山地区富蕴一库尔勒布设的流动地震台，经过连续两年的观测所采集的数据，挑选远震P波到时数据，进行了地震层析反演处理，获得此剖面地震层析图像推断地壳上地幔的速度结构。反演结果表明，富蕴-库尔勒剖面上塔里木板块向北的推进相对于西部有所减弱，在西部表现强烈的造山作用，向东逐步减缓，在天山的底部不过100km上下。地震活动集中在此范围内。岩石圈物质移动方向发生变化部分向东推移，自然也降低了天山的隆升作用，从而造成天山西段和东段的差异。在本剖面范围内天山的Moho面结构复杂有重叠、斜插特征，深度最大在天山地区达80km，准噶尔盆地和本剖面范围内塔里木盆地北部Moho面深度为40～50km。
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 to mography. 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.
出处
《地质学报》
EI
CAS
CSCD
北大核心
2006年第1期142-147,共6页
Acta Geologica Sinica
基金
国家"973"项目所属专题(编号2001CB409810)资助的研究成果
关键词
天山
层析成像
地壳上地幔
速度结构
Tianshan
tomography
crust and upper mantle
velocity structure
