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国家自然科学基金(40804007)

作品数:4 被引量:19H指数:4
相关作者:李信富李红谊徐小明贾晋生宫猛更多>>
相关机构:中国地质大学(北京)中国地质大学(北京)中国地震局地球物理研究所更多>>
发文基金:国家自然科学基金中央高校基本科研业务费专项资金更多>>
相关领域:天文地球农业科学更多>>

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Radial Anisotropy in the Crust beneath the Northeastern Tibetan Plateau from Ambient Noise Tomography被引量:4
2015年
Through analysis of Rayleigh wave and Love wave Green's functions estimated from ambient noise tomography, we obtain radial anisotropy and shear wave velocity structure beneath the northeastern Tibetan Plateau. With two hundred and twenty three broadband seismic stations deployed by China Earthquake Administration, a collaborative seismic experiment of northern Tibet(ACSENT) experiment and northeastern Tibet seismic(NETS) experiment provide the unprecedented opportunity to resolve the spatial distribution of the radial anisotropy within the crust of the northeastern Tibetan Plateau. Discrepancies between Love(sh) and Rayleigh(sv) wave velocities show complex anisotropic patterns associated with the dynamic processes of the collision between the Indian and Eurasian plates:(1) In the upper crust, V(sv)〉V(sh) anisotropy is dominant throughout the study area which probably reflects fossil microcracks induced by the uplift, folding and erosion geodynamic processes;(2) in the middle crust, V(sh)〉V(sv) observed beneath the Songpan-Ganzi terrane and the northwestern Qilian orogen correlates well with a mid-crustal low velocity zone(LVZ);(3) at depths deeper than 40 km, V(sh)〉V(sv) is still found in the Songpan-Ganzi terrane. This anisotropy could be caused by the sub-horizontal alignment of anisotropic minerals that has followed the collision between India and Eurasia. However, the northwestern Qilian orogen is associated with V(sv)〉V(sh) anisotropy which may be related to the vertically aligned seismic anisotropic minerals caused by the crustal thickening.
Jing TanHongyi LiXinfu LiMing ZhouLongbin OuyangSanjian SunDan Zheng
Three-Dimensional S-Wave Velocity Structure in Eastern Tibet from Ambient Noise Rayleigh and Love Wave Tomography被引量:4
2011年
We apply ambient noise tomography to continuous three-component broadband seismic data between January 1,2008 and December 31,2008 from the regional networks of 76 stations de-ployed by China Earthquake Administration.Ambient noise cross-correlations were performed to produce the Green's functions of each station-pair.Within the period from 6 to 50 s,Rayleigh and Love wave dispersion curves were measured using the multiple filter analysis method.Then three-dimensional(3-D) S-wave velocity structures from the surface down to 70 km are inverted from both Rayleigh and Love wave dispersion results.The obtained S-wave velocity maps show strong lateral variations and correlate well with the distinct geological and tectonic features in the study area.The Sichuan basin displays low velocity in shallow depth due to thick sedimentary deposits but high velocity in the mid-lower crust;the eastern Tibetan plateau is clearly featured with a low-velocity zone in its mid-to-lower crust which is consistent with the crustal flow model proposed to explain the mechanism of uplift and pattern of deformation for the Tibetan plateau.Meanwhile,our results also exhibit that the crustal thickness decreased from the eastern Tibetan plateau to the Sichuan basin.
徐小明李红谊宫猛丁志峰
新疆地区地壳S波速度结构及径向各向异性研究被引量:5
2014年
应用背景噪声层析成像方法对新疆地区地壳S波速度结构以及径向各向异性进行了研究。利用中国地震局数字地震台网和吉尔吉斯斯坦及哈萨克斯坦台网记录的2009年1月至9月的连续三分量背景噪声数据,对所有台站对之间进行互相关计算,通过时频分析和相位匹配技术得到了每个台站对8s到50s的群速度和相速度频散曲线,显示出明显的横向不均匀性,与研究区主要地质结构和构造单元具有良好的相关性。通过反演纯路径频散数据得到了地壳和上地幔顶部的S波速度结构和径向各向异性的结果;根据SH波和SV波速度结构差异得到研究区内的径向各向异性的分布特征;讨论了各向异性产生的机理。
周铭李红谊李信富谭静孙三健欧阳龙斌郑丹
关键词:群速度相速度
利用背景噪声成像研究青藏高原及邻区地壳上地幔顶部速度结构
<正>背景噪声无源成像法是国际上近年来快速发展的一种新的成像方法,其核心思想就是可以通过两台长时间记录的连续噪声进行互相关计算来提取两台之台间的格林函数。该方法既不依赖地震的发生,也不需震源车或进行人工爆破,只需对连续记...
李红谊
青藏高原东部基于噪声的面波群速度分布特征被引量:8
2010年
通过收集青海、甘肃、四川三省的76个地震台记录的2008年1—12月三分量的连续噪声数据,利用噪声面波层析成像的方法获得了青藏高原东部的面波群速度分布特征。首先采用多重滤波方法提取了1 000多条台站对5~50 s的三分量面波群速度频散曲线,然后将研究区域划分为0.2°×0.2°的网格,利用O ccam方法反演了瑞利波(R-R)和勒夫波(T-T)的群速度分布。反演得到的群速度分布特征与地表地质和构造特征表现出较好的相关性,清晰地揭示了地壳内部的横向速度变化。层析成像的结果显示在短周期(8~20 s)内,拥有较厚的沉积层的四川盆地表现为明显的低速特征,而青藏高原东部则表现为较高的群速度分布特征;随着周期的增加(>20 s),群速度的分布特征呈现出与短周期相反的特性,青藏高原东部下方的速度远远低于四川盆地,这可能与青藏高原东部中、下地壳低速层相关联,同时也意味着研究区域的地壳结构具有明显的横向不均匀性。在群速度分布图上,龙门山不仅是四川盆地与青藏高原的地形和构造分界带,同时也对应着高群速度与低群速度的过渡带。
宫猛李红谊徐小明李信富贾晋生
关键词:背景噪声面波地壳构造横向不均匀性
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