nam 22 uu 4500 dbt_mods_00012519 dbt_mods_00012519 ger DE-601 rda eng 2009-03-06 550 sdnb Tran Thanh Tuan Dr. rer. nat. Author aut (DE-588)137518625 The ellipticity (H/V-ratio) of Rayleigh surface waves Tran Thanh Tuan Jena 2009 135 Seiten text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier Dissertation, Friedrich-Schiller-Universität Jena, 2009 It has long been observed that damage to human settlements during earthquakes depends greatly both on the local properties of the soil, and on other features such as irregular surface topography and underground morphology. One of the most efficient ways to define the soil properties is the H/V-method, which yields an estimation of the ratio between the Fourier amplitude spectra of the horizontal (H) to vertical (V) components of the ambient noise vibrations recorded at one single station. Considering that the most dominant contributions to ambient vibrations are known to come from surface waves, although the exact composition may change depending on the particular site, the aim of this thesis is to more deeply investigate the behavior of the H/V-ratio curve of Rayleigh waves, and thereby contribute to the further development of the established H/V-method. The method of the thesis is to study the H/V-ratio of Rayleigh waves, working from simple to complex models. The model complexity ranges from the easiest model, ``homogeneous half-space&#39;&#39;, to the most general model: ``inhomogeneous layer over homogeneous half-space&#39;&#39;. The thesis concentrates on the peaks and the troughs of H/V curves which play an important role in the H/V calculation, and how specific parameters affect them. I additionally study the motion of an individual particle. By studying the peaks and troughs, I construct maps showing their frequency relationships with parameters of the model and propose applications to the study of natural disasters. The thesis is also devoted to determining the H/V-ratio of a body incident wave which is generated from deep inside the substrate, for example by an earthquake. I show the similarity of the H/V-ratio in this scenario to the H/V-ratio of a surface wave with a turbulence noise. It turns out that these two H/V-ratios are identical if the phase velocity is that of a Rayleigh wave. Rayleigh-Welle gnd Vulkanisches Beben gnd Raumwelle <Seismologie> gnd thesis Malischewsky, Peter Prof. Dr. Reviewer rev (DE-588)1211592642 Scherbaum, Frank Prof. Dr. Reviewer rev (DE-588)1201385598 Friedrich-Schiller-Universität Jena Chemisch-Geowissenschaftliche Fakultät host institution his https://www.db-thueringen.de/receive/dbt_mods_00012519 object in context https://www.db-thueringen.de/servlets/MCRZipServlet/dbt_derivate_00016884 raw object https://www.db-thueringen.de/rsc/thumbnail/dbt_mods_00012519.png preview http://uri.gbv.de/document/gvk:ppn:593235142 uri