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中国科学院地质与地球物理研究所第十届(2010年度)学术年会

作者： juan li and fenglin niu 1 key laboratory of the earth’s deep interior,institute of geology and geophysics,chinese academy of sciences,beijing,china. 2 department of earth science,rice university,houston,texas,usa.

[1]Northeast china.is situated partly on the sino-Korean craton and partly on a portion of the Inner Mongolia fold *** by widespread Cenozoic intraplate volcanism and deformation caused by multiepisode extension,northeast china.is an ideal place to study the underlying physical processes of rifting and active *** measured sKs wave splitting parameters from several regional networks of broadband stations recently deployed in northeast *** employed a multievent signal-to-noise ratio (sNR)weighted method and obtained measurements of splitting parameters at 108 stations. These stations cover a variety of tectonic terranes,including the songliao basin,the Jiamusi massif,the Inner Mongolia belt and the Yanshanian orogenic ***,the observed sKs splitting times are of low amplitude(～0.8 s),indicating that the underlying mantle experienced relatively weak deformation in this *** observed anisotropy varies consistently from place to place and exhibits an asymmetric pattern across the songliao *** the southeast edge of the songliao basin,the fast axis aligns nicely along the NW-sE direction,whereas the axis rotates slightly to NNW toward north beneath the Jiamusi *** the west edge of the basin where the north-south gravity lineament(NsGL)is located,we found significant scatter in the fast-axis direction. At the Yanshanian orogenic belt in the southwest corner of the basin,the fast axis aligns along the EW *** amplitude of the splitting time appears to be positively correlated with lithospheric thickness,suggesting that lithospheric deformation is the likely cause of the observed seismic anisotropy.

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seismic anisotropy and implications for mantle deformation beneath the NE margin of the Tibet plateau and Ordos plateau

Seismic anisotropy and implications for mantle deformation b...

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中国科学院地质与地球物理研究所第11届（2011年度）学术年会

作者： juan li~(a,*),Xiujiao Wang~a,fenglin niu~b a key laboratory of the earth’s deep interior,institute of geology and geophysics,chinese academy of sciences,beijing china.b department of earth sciences,rice university,usa

The northeastern Tibet and the Ordos plateau connects east china.and west china.which are dominated by horizontal extension and compression,*** of seismic anisotropy beneath this transitional region can provide important constraints on deformation pattern of the crust and lithosphere mantle during an orogeny *** measured sKs wave splitting parameters from the new installed regional networks and obtained a detailed anisotropy map for 119 broadband *** the NE margin of Tibet,the observed WNW fast polarization direction is parallel to the surface geological features. The coherence between the observed geodetic motion of the crust and fast axis direction suggests that the vertical coherent deformation of the lithosphere is the dominate source for the observed seismic *** east to the Qinling orogenic belt,the fast axis direction tracks change in strike of the faults,with the fast direction aligning almost *** suggest that both the lithosphere mantle and east extrusion of mantle material contribute to the observed *** value of delay time is observed interior the thick-rooted Ordos plateau,suggesting a rigid and stable lithosphere with little deformation. The deviation of fast polarization direction beneath the adjacent rifting regions might be caused by the edge flow induced by sharp changes in the thickness of *** results propose that the upper crust and mantle lithosphere beneath the northeastern Tibet are at least partly coupled,or subjected to the same boundary conditions,which is inconsistent with the channelized lower crustal flow model.

关键词： seismic anisotropy Mantle deformation sKs splitting Tibet plateau Ordos plateau

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Component azimuths of the CEArray stations estimated from P-wave particle motion

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earthquake science 2011年第1期24卷 3-13页

作者： fenglin niu juan li department of earth science Rice University Houston TX 77005 USA key laboratory of the earth's deep interior Institute of Geology and Geophysics Chinese Academy of Sciences Beijing 100029 China

The recently built china.Digital seismic Network consists of the china.National Digital seismic Network （CNDsN）, 31 regional seismic networks and several small aperture arrays with more than 1 000 stations including 850＋ broadband stations. It forms a gigantic seismic array that provides an unprecedented opportunity to study the earth＇s deep interior besides its routine task of seismic monitoring. Many modern seismic studies rely on rotation of vertical and horizontal components in order to separate different types of seismic waves. Knowledge of the orientations of the two horizontal components thus is important to perform a correction rotation. We analyzed particle motions of teleseismic P waves recorded by the network and used them to estimate the northcomponent azimuth of each station. An sNR-weighted-multi-event method was introduced to obtain component azimuths that best explain the P-wave particle motions of all the events recorded at a station. The method provides robust estimates including a measurement error calculated from background noise levels. We found that about one third of the stations have some sort of problems, including misorientation of the two horizontal components, mislabeling and polarity reversal in one or more components. These problems need to be taken into account for any rotation based seismic studies.

关键词： P-wave particle motion back azimuth component azimuth CEArray

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