Can we estimate local Love wave dispersion properties from collocated amplitude measurements of translations and rotations?
Can we estimate local Love wave dispersion properties from collocated amplitude measurements of translations and rotations?
复制标题
DOI：
10.1029/2009gl042215
复制
发表时间：
2010-02-25
影响因子：
5.2
通讯作者：
Schreiber, Ulrich
中科院分区：
文献类型：
--
作者：
Kurrle, Dieter;Igel, Heiner;Schreiber, Ulrich
我们调查的可能性，确定当地的频散特性的乐甫波使用地震图的横向加速度和旋转率在同一地点记录的垂直轴周围。假设平面波传播，相速度信息包含在两种不同类型的地面运动的频率相关的振幅比。我们使用环形激光系统和宽频带地震仪在大地观测台Wettzell在德国东南部的真实的测量，以及正常模式求和计算的合成地震图，这种方法进行测试。虽然一般的色散特性可以恢复，我们表明，泛音的贡献阻碍了使用这种方法进行结构反演。为了提取包含在旋转和平移的同位测量中的结构信息，全波形反演是必要的。引文：Kurrle，D.，H. Igel，A. M. G. Ferreira、J. Wassermann和U. Schreiber（2010），我们能否从平移和旋转的同位振幅测量中估计局部Love波色散特性？，地球物理学家。保留信函：37，L04307，doi：10.1029/2009GL042215。
We investigate the possibility of determining local dispersion characteristics of Love waves using seismograms of transverse acceleration and rotation rate around a vertical axis recorded at the same site. Assuming plane wave propagation, phase velocity information is contained in the frequency-dependent amplitude ratio of the two different types of ground motion. We perform tests of this method using real measurements from a ring laser system and a broadband seismometer at the geodetic observatory Wettzell in southeast Germany as well as synthetic seismograms computed by normal mode summation. While general dispersion characteristics can be recovered, we show that the contribution of overtones impedes the use of this method for structural inversion. To extract the structural information contained in collocated measurements of rotations and translations, a full waveform inversion is necessary. Citation: Kurrle, D., H. Igel, A. M. G. Ferreira, J. Wassermann, and U. Schreiber (2010), Can we estimate local Love wave dispersion properties from collocated amplitude measurements of translations and rotations?, Geophys. Res. Lett., 37, L04307, doi: 10.1029/2009GL042215.