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新疆地区S波分裂研究h
引用本文:冯强强,吴庆举,李永华,潘佳铁,张风雪,张广成,余大新.新疆地区S波分裂研究h[J].地震学报,2012,34(3):296-307.
作者姓名:冯强强  吴庆举  李永华  潘佳铁  张风雪  张广成  余大新
作者单位:1)nbsp 中国北京100081中国地震局地球物理研究所2)nbsp 中国广州510760广州海洋地质调查局
基金项目:国家自然科学基金,科技部国际科技合作项目
摘    要:利用国家地震台网及中国地震局ldquo;十五rdquo;期间在新疆地区布设的宽频地震台站记录到的远震波形数据,采用最小能量法和旋转相关法分别对SKS、 SKKS震相进行了偏振分析,计算了台站下方介质各向异性的分裂参数:快波的偏振方向(phi;)和慢波延迟时间(delta;t).研究结果表明,塔里木盆地北缘、天山造山带和阿尔泰造山带大多数台站的快波偏振方向与台站下方构造走向方向接近,其快慢波分裂延迟介于0.8——1.8 s之间. 这与印度 欧亚碰撞导致的岩石圈缩短有关.相比而言,塔里木盆地和准噶尔盆地内部的各向异性强度明显要弱,表明其自前寒武形成以来并没有经历强烈的变形作用.阿尔金断裂带附近台站下方各向异性快波方向与断裂带的走向具有很强的相关性,表明该断裂已经切穿整个岩石圈. 

关 键 词:新疆地区    各向异性    S波分裂    造山带

Shear wave splitting in Xinjiang region
Feng Qiangqiang , Wu Qingju , Li Yonghua , Pan Jiatie , Zhang Fengxue , Zhang Guangcheng , Yu Daxin.Shear wave splitting in Xinjiang region[J].Acta Seismologica Sinica,2012,34(3):296-307.
Authors:Feng Qiangqiang  Wu Qingju  Li Yonghua  Pan Jiatie  Zhang Fengxue  Zhang Guangcheng  Yu Daxin
Institution:1) Institute of Geophysics, China Earthquake Administration, Beijing 100081, China2) Guangzhou Marine Geological Survey, Guangzhou 510760, China
Abstract:Shear wave splitting analysis has been carried out using teleseismic data from broadband digital seismic stations permanently deployed in Xinjiang region.We determined fast polarization direction(φ) and delay time(δt) between fast and slow waves using both the minimum energy method and rotation-correlation method.Our measurements show that fast directions of teleseismic shear wave beneath the northern Tarim basin,Tien Shan orogenic belt and Altai orogenic belt are generally parallel to the strike of structure beneath the stations.The delay times vary from 0.8 s to 1.8 s.All of these are related to shortening of lithosphere caused by the collision between India and Eurasia continent.In contrast,weak anisotropy beneath Tarim basin and Junggar basin implies that these basins have not experienced strong deformation since Cambrian.The fast polarization directions near the Altyn fault show remarkable correspondence with the fault strike,indicating that the fault may cut the whole lithosphere.
Keywords:Xinjiang region  anisotropy  shear wave splitting  orogenic belt
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