地震学报Issue(1)：15-28,14.DOI:10.11939/jass.2016.01.002
小江断裂带北段地壳浅层 P 波速度各向异性观测的原理与数值试验
Observation of P-wave velocity anisotropy of the shallow crust in the northern Xiaojiang fault zone:Principle and numerical tests
摘要
Abstract
This paper proposes a new technique,residual slowness vector tech-nique (RST),for estimating anisotropy of the seismic velocity using the resi-duals of traveling times assuming that 2-D observed velocity field is taken as the superposition of anisotropic field and isotropic one.And then the technique is applied to P traveling time residuals of 3 181 events recorded by 24 stations of the Qiaojia Array,a mobile array of seismic broadband stations installed across the northern Xiaojiang fault zone.The residual slowness vectors are calculated within a scale of 0.5°×0.5°in the horizontal direction and 0—5 km in the verti-cal direction around the observation stations.Finally the polarization directions of the fast P-velocity and slow P-velocity are obtained at all the stations by using the RST.The results show that the directions of the P-velocity at most of the stations are in good agreement.The fast-P directions point to ESE,which near-ly agrees with the P axis direction of stress field in northern Xiaojiang fault zone,while the slow-P directions point to NNE,which nearly agrees with the T axis direction,implying that long period of stress action might be one of the important factors causing the P wave velocity anisotropy in this region.关键词
各向异性/P 波速度/走时残差/小江断裂带北段Key words
anisotropy/P-wave velocity/travelling time residual/northern Xiaojiang fault zone分类
天文与地球科学引用本文复制引用
马起杨,许力生,严川,李春来,许康生..小江断裂带北段地壳浅层 P 波速度各向异性观测的原理与数值试验[J].地震学报,2016,(1):15-28,14.基金项目
中国地震局地球物理研究所基本业务费专项（DQJB14B01）和国家自然基金（41474046）联合资助． （）
