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Technique for Combining Surface Wave Tomography with Receiver Function Results for Studying Upper Mantle Velocity Structure
Izvestiya, Physics of the Solid Earth ( IF 0.9 ) Pub Date : 2020-03-01 , DOI: 10.1134/s1069351320020111
T. B. Yanovskaya

Abstract —A technique is proposed for joint inversion of the surface-wave velocity dispersion data from long travelpaths and the results of the receiver function method. The technique is based on a modification of a surface-wave tomography procedure and allows for the use of the data not only from travelpaths but also obtained at individual isolated points. Initially, the data are reduced to a single type: either to surface wave velocity by calculating the dispersion curve from the vertical velocity section obtained by the receiver function method or to shear wave velocity by one-dimensional inversion of surface-wave dispersion curves from travelpaths. Thus, from the computational point of view, the problem reduces to the following one: to obtain a smoothed estimate of a two-dimensional function from the values ​​of this function at individual points and its average values along lines (travelpaths) which can be considered as straight. A direct application of a surface-wave tomography procedure under the assumption that the points are lines of zero length is impossible because the solution turns out to be singular at the points. To get rid of this obstacle, it is proposed to replace the points by circles of a small radius surrounding these points. Then, the problem of tomography is generalized by using data not only from linear travelpaths, but also from circular travelpaths. A numerical study has shown that an addition of point data results in an increase in the resolution.

中文翻译:

结合面波层析成像与接收函数结果研究上地幔速度结构的技术

摘要 — 提出了一种联合反演来自长传播路径的表面波速度色散数据和接收函数方法结果的技术。该技术基于对表面波断层扫描程序的修改,不仅允许使用来自行进路径的数据,还允许使用在各个孤立点获得的数据。最初,数据被简化为单一类型:通过从接收函数方法获得的垂直速度截面计算频散曲线来计算面波速度,或者通过行进路径的面波频散曲线一维反演来计算横波速度. 因此,从计算的角度来看,问题简化为以下问题:从该函数在各个点处的值及其沿可被视为直线的线(行进路径)的平均值获得二维函数的平滑估计。在假设点是零长度的线的情况下直接应用表面波断层扫描程序是不可能的,因为结果在这些点处是奇异的。为了摆脱这个障碍,建议用围绕这些点的小半径圆来代替这些点。然后,不仅使用来自线性行进路径的数据,还使用来自圆形行进路径的数据来概括断层扫描的问题。数值研究表明,添加点数据会提高分辨率。在假设点是零长度的线的情况下直接应用表面波断层扫描程序是不可能的,因为结果在这些点处是奇异的。为了摆脱这个障碍,建议用围绕这些点的小半径圆来代替这些点。然后,不仅使用来自线性行进路径的数据,还使用来自圆形行进路径的数据来概括断层扫描的问题。数值研究表明,添加点数据会提高分辨率。在假设点是零长度的线的情况下直接应用表面波断层扫描程序是不可能的,因为结果在这些点处是奇异的。为了摆脱这个障碍,建议用围绕这些点的小半径圆来代替这些点。然后,不仅使用来自线性行进路径的数据,还使用来自圆形行进路径的数据来概括断层扫描的问题。数值研究表明,添加点数据会提高分辨率。不仅使用来自线性行进路径的数据,还使用来自圆形行进路径的数据,断层扫描的问题得到了概括。数值研究表明,添加点数据会提高分辨率。不仅使用来自线性行进路径的数据,还使用来自圆形行进路径的数据,断层扫描的问题得到了概括。数值研究表明,添加点数据会提高分辨率。
更新日期:2020-03-01
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