Azimuthal anisotropy of Rayleigh waves beneath the Tibetan Plateau and adjacent areas

来源 :Science in China(Series D:Earth Sciences) | 被引量 : 0次 | 上传用户:sairei
下载到本地 , 更方便阅读
声明 : 本文档内容版权归属内容提供方 , 如果您对本文有版权争议 , 可与客服联系进行内容授权或下架
论文部分内容阅读
The crustal and upper mantle azimuthal anisotropy of the Tibetan Plateau and adjacent areas was studied by Rayleigh wave tomography. We collected sufficient broadband digital seismograms trav-ersing the Tibetan Plateau and adjacent areas from available stations, including especially some data from the temporary stations newly deployed in Yunnan, eastern Tibet, and western Sichuan. They made an adequate path coverage in most regions to achieve a reasonable resolution for the inversion. The model resolution tests show that the anisotropic features of scope greater than 400 km and strength greater than 2% are reliable. The azimuthal anisotropy pattern inside the Tibetan Plateau was similar to the characteristic of tectonic partition. The crustal anisotropy strength is greater than 2% in most re-gions of East Tibet, and the anisotropy shows clockwise rotation surrounding the eastern Himalayan syntaxis. Vertically, the anisotropy direction indicates a coherent pattern within the upper crust, lower crust, and lithosphere mantle of the Tibetan Plateau, which also is consistent with GPS velocity field and SKS fast polarization directions. The result supports that the crust-mantle deformation beneath the Tibetan Plateau is vertically coherent. The anisotropy strength of crust and lithospheric upper mantle in Yunnan outside the Tibetan Plateau is lower than 2%, so SKS splitting from core-mantle boundary to station should largely be attributed to the anisotropy of asthenosphere. The crustal and upper mantle azimuthal anisotropy of the Tibetan Plateau and adjacent areas was studied by Rayleigh wave tomography. We collected sufficient broadband digital seismograms trav-ersing the Tibetan Plateau and adjacent areas from available stations, including especially some data from the new ones They made an adequate path coverage in most regions to achieve a reasonable resolution for the inversion. The model resolution tests show that the anisotropic features of the scope greater than 400 km and strength greater than 2% are reliable. The azimuthal anisotropy pattern inside the Tibetan Plateau was similar to the characteristic of tectonic partition. The crustal anisotropy strength is greater than 2% in most re-gions of East Tibet, and the anisotropy shows clockwise rotation surrounding the eastern Himalayan syntaxis. Vertically , the anisotropy direction indicates a coherent pattern within the upper crust , lower crust, and lithosphere mantle of the Tibetan Plateau, which also consistent with GPS velocity field and SKS fast polarization directions. The result supports the the crust-mantle deformation beneath the Tibetan Plateau is vertically coherent. The anisotropy strength of crust and lithospheric upper mantle in Yunnan outside the Tibetan Plateau is lower than 2%, so SKS splitting from core-mantle boundary to station should largely be attributed to the anisotropy of asthenosphere.
其他文献
几年前,因课题调研,我接触了重庆市绿色志愿者联合会(简称绿联会)。它是中国的一个环保类草根NGO(non-govermental organizations)。NGO直译为非政府组织,草根NGO(grassroots
我省如何实施竞技体系与教育体系相结合体制(下称“两结合”体制),使优秀运动队向学校化过渡,持续稳定地提高竞技体育水平,是摆在我们面前亟待解决的重要研究课题。一、问题
Time-dependentTheoryofRamanScatteringwithPulses--ApplicationtoContinuumRamanSpectroscopySoo-Y.Lee(DepartmentofChemistry,Facul... Time-dependentTheoryofRamanScatteringwithPulses - ApplicationtoContinuumRamanSpectroscopySoo-Y. Lee (DepartmentofChemistry, F
期刊
Oxidative coupling reaction of methane (OCM) was studied over Ba-La-O-F catalysts. F-anions exhibited apparent promoting effects on Ba-La-O-F catalysts for OCM
The cationic polymerization of 1, 3-pentadiene was initiated by the organic azide/Et_2 AlClinitiating system in CH_2Cl_2 and n-hexane. The polymerizations were
信息技术是一门十分重要的学科,但受应试教育思想影响,个别学校和教师对信息技术教学重视不够。本文对当前我国中小学信息技术教育现状进行理性分析,并就提高信息技术教育水
环境污染、资源短缺已经成为制约经济社会可持续发展的一个重要因素,完善环境保护税收政策应该是解决该问题的有效途径。本文分析了国内现行相关税收政策在环境保护、节约资
As a new kind of cationic photoinitiator, iron-arene complex has received much attention in recent years. The authors have reported the synthesis of cyclopenta
目的探讨住院2型糖尿病患者的临床诊断、相关生化指标及临床用药之间的关系,为临床医师推荐合理的处方治疗方案。方法回顾性分析2012年~2014年住院治疗的312例住院2型糖尿病
辽宁省人大代表郭艳同时是辽阳市人大常委会委员、白塔区人大常委会副主任。当代表10多年来,郭艳紧紧围绕全市的工作大局,人民群众关心的“热点”、难点问题,领衔并与其他代