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联合绝对重力和重力反演与气候实验卫星(gravity recovery and climate experiment,GRACE)重力多年观测数据,获得了青藏高原多个基准站区域的地壳垂直形变速率。研究结果表明,绝对重力呈明显的负变化,绝对重力和卫星重力的时变系统差也呈较一致的负值,鼎新(DXIN)、德令哈(DLHA)、西宁(XNIN)、拉萨(LHAS)和仲巴(XZZB)5个基准站的区域地壳垂直形变呈明显的隆升状态,即拉萨块体、祁连块体和阿拉善块体处于地壳隆升状态,隆升速率分别约为2.01±0.15mm/a、1.88±0.19mm/a、1.91±0.10mm/a。在印度板块和欧亚板块的双向挤压下,青藏高原的地壳在不断的隆升与增厚,平均隆升速率约为1.94±0.17mm/a,平均增厚速率约为2.35±3.30mm/a。
The crustal vertical deformation rate of multiple base stations over the Qinghai-Tibet Plateau was obtained by combining the gravimetric data of gravity recovery and climate experiment (GRACE) with absolute gravity and gravity inversion. The results show that the absolute gravity shows a significant negative change, and the absolute difference between the absolute gravitation and the satellite gravity is also consistently negative. DXIN, DLHA, XNIN and LHAS ) And Zhongzhu (XZZB), the vertical crustal deformation of the five base stations showed obvious uplifts. The Lhasa block, Qilian block and Alashan block are in the state of crustal uplift, and the uplift rates are about 2.01 ± 0.15 mm / a, 1.88 ± 0.19 mm / a, 1.91 ± 0.10 mm / a. Under the bi-directional squeezing of the Indian plate and the Eurasian plate, the crust in the Qinghai-Tibet Plateau is continuously uplifted and thickened with an average uplift rate of about 1.94 ± 0.17mm / a and an average thickening rate of about 2.35 ± 3.30mm / a.