时变重力测量确定青藏高原地壳隆升与增厚速率

发布时间：2018-02-25 17:27

本文关键词： 绝对重力卫星重力重力测量重力变化隆升增厚　出处：《武汉大学学报(信息科学版)》2017年05期 　论文类型：期刊论文

【摘要】：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。
[Abstract]:Combined with absolute gravity and gravity inversion and climate experiment satellite gravity recovery and climate expert Grac, the vertical crustal deformation rates of several reference stations over the Qinghai-Xizang Plateau have been obtained. The results show that absolute gravity varies negatively. The time-varying system difference of absolute gravity and satellite gravity is also negative. The vertical deformation of the regional crust at Dingxin DXING, Delinghan DLHAI, Xining XNINI, Lhasa and Zhongba XZZB) stations shows an obvious uplift state, that is, Lhasa block. Qilian block and Alashan block are in the state of crustal uplift, the uplift rate is about 2.01 卤0.15mm / a 1.88 卤0.19mm / a / a respectively. Under the compression of Indian plate and Eurasian plate, the crust of Qinghai-Xizang Plateau is continuously rising and thickening. The average uplift rate is about 1.94 卤0.17mm / a, and the average thickening rate is about 2.35 卤3.30mm / a.
【作者单位】：中国地震局地震研究所地震大地测量重点实验室;
【基金】：中国地震局地震研究所基本科研业务专项(IS201326130);中国地震局地震行业科研专项(201508006) 国家973计划(2013CB733304)~~
【分类号】：P223;P542

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